New to DGDK (and some parts of C++), having trouble with variables

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Yodaman Jer

User Banned

Posted: 4th Feb 2011 05:49

Hey guys,

I'm fairly new to C++ (just started seriously looking into it a couple of months ago), and I thought that using DGDK would be a good way to get even more serious with it. I seem to be having trouble with variables. Variables! Something as simple as that.

Here's my code...

#include "DarkGDK.h"

// the main entry point for the application is this function
void DarkGDK ( void )
{
	// turn on sync rate and set maximum rate to 60 fps
	dbSetDisplayMode(960,720,32);
	dbSetWindowSize(960,720);
	dbSetWindowPosition(0,0);
	dbSetWindowTitle("Main Screen");
	dbSetTextFont("microsoft sans serif");
	dbSetTextSize(12);
	dbSyncOn   ( );
	dbSyncRate ( 60 );

// our main loop
	while ( LoopGDK ( ) )
	{
		dbCLS(dbRGB(0,0,0));
		//create a box
	    dbBox(dbScreenWidth()/2-122,dbScreenHeight()/2-50,dbScreenWidth()/2+122,dbScreenHeight()/2-30,dbRGB(15,15,15),dbRGB(55,55,55),dbRGB(15,15,15),dbRGB(55,55,55));
		
		//check for mouse hovering and clicking
		if (dbMouseX() > dbScreenWidth()/2-122 && dbMouseY() > dbScreenHeight()/2-50 && dbMouseX() < dbScreenWidth()/2+122 && dbMouseY() < dbScreenHeight()/2-30 && dbMouseClick()==1)
		{
			dbCenterText(dbScreenWidth()/2,dbScreenHeight()-15,"This has been clicked");
			dbBox(dbScreenWidth()/2-123,dbScreenHeight()/2-51,dbScreenWidth()/2+123,dbScreenHeight()/2-29,dbRGB(255,255,255),dbRGB(255,255,255),dbRGB(255,255,255),dbRGB(255,255,255));
			dbBox(dbScreenWidth()/2-122,dbScreenHeight()/2-50,dbScreenWidth()/2+122,dbScreenHeight()/2-30,dbRGB(55,55,55),dbRGB(15,15,15),dbRGB(55,55,55),dbRGB(15,15,15));
		}

if (dbMouseClick()==2)
		{
			int bActive=1;
			int OldMouseX=dbMouseX();
			int OldMouseY=dbMouseY();
			
			if (bActive==1)
		    {

dbBox(OldMouseX,OldMouseY,OldMouseX+250,OldMouseY+300,dbRGB(55,55,55),dbRGB(15,15,15),dbRGB(55,55,55),dbRGB(15,15,15));
			    dbText(OldMouseX+5,OldMouseY+15,"You clicked!");
			    if (dbMouseClick()==1 && bActive==1) {bActive=0;break;}
		    }
		}

// update the screen
		dbSync ( );
	}

// return back to windows
	return;
}

+ Code Snippet

#include "DarkGDK.h"

// the main entry point for the application is this function
void DarkGDK ( void )
{
	// turn on sync rate and set maximum rate to 60 fps
	dbSetDisplayMode(960,720,32);
	dbSetWindowSize(960,720);
	dbSetWindowPosition(0,0);
	dbSetWindowTitle("Main Screen");
	dbSetTextFont("microsoft sans serif");
	dbSetTextSize(12);
	dbSyncOn   ( );
	dbSyncRate ( 60 );


	// our main loop
	while ( LoopGDK ( ) )
	{
		dbCLS(dbRGB(0,0,0));
		//create a box
	    dbBox(dbScreenWidth()/2-122,dbScreenHeight()/2-50,dbScreenWidth()/2+122,dbScreenHeight()/2-30,dbRGB(15,15,15),dbRGB(55,55,55),dbRGB(15,15,15),dbRGB(55,55,55));
		
		//check for mouse hovering and clicking
		if (dbMouseX() > dbScreenWidth()/2-122 && dbMouseY() > dbScreenHeight()/2-50 && dbMouseX() < dbScreenWidth()/2+122 && dbMouseY() < dbScreenHeight()/2-30 && dbMouseClick()==1)
		{
			dbCenterText(dbScreenWidth()/2,dbScreenHeight()-15,"This has been clicked");
			dbBox(dbScreenWidth()/2-123,dbScreenHeight()/2-51,dbScreenWidth()/2+123,dbScreenHeight()/2-29,dbRGB(255,255,255),dbRGB(255,255,255),dbRGB(255,255,255),dbRGB(255,255,255));
			dbBox(dbScreenWidth()/2-122,dbScreenHeight()/2-50,dbScreenWidth()/2+122,dbScreenHeight()/2-30,dbRGB(55,55,55),dbRGB(15,15,15),dbRGB(55,55,55),dbRGB(15,15,15));
		}

		
		if (dbMouseClick()==2)
		{
			int bActive=1;
			int OldMouseX=dbMouseX();
			int OldMouseY=dbMouseY();
			
			if (bActive==1)
		    {

			    dbBox(OldMouseX,OldMouseY,OldMouseX+250,OldMouseY+300,dbRGB(55,55,55),dbRGB(15,15,15),dbRGB(55,55,55),dbRGB(15,15,15));
			    dbText(OldMouseX+5,OldMouseY+15,"You clicked!");
			    if (dbMouseClick()==1 && bActive==1) {bActive=0;break;}
		    }
		}

		

		// update the screen
		dbSync ( );
	}

	// return back to windows
	return;
}

Here's the part I'm having trouble with:

+ Code Snippet

if (dbMouseClick()==2)
		{
			int bActive=1;
			int OldMouseX=dbMouseX();
			int OldMouseY=dbMouseY();
			
			if (bActive==1)
		    {

			    dbBox(OldMouseX,OldMouseY,OldMouseX+250,OldMouseY+300,dbRGB(55,55,55),dbRGB(15,15,15),dbRGB(55,55,55),dbRGB(15,15,15));
			    dbText(OldMouseX+5,OldMouseY+15,"You clicked!");
			    if (dbMouseClick()==1 && bActive==1) {bActive=0;break;}
		    }
		}

What I want to do is make it so that if the user right-clicks anywhere in the program, a "menu" appears at the old mouse positions, but I can only achieve this if the user holds the mouse button down. I thought that by adding the variable "bActive" would fix this, but I encountered an error that said "bActive is not declared in this scope", and I found out the only way I could use it was if I included it in the dbMouseClick==2 code block, but that totally defeats the purpose of even creating it and it doesn't even work!

I have no idea how to make variables global. I tried what's outlined in this page but it didn't work. What am I doing wrong? What do I need to do?

Thanks for any and all help,
-CoffeeCoder

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dark coder

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Joined: 6th Oct 2002

Location: Japan

Posted: 4th Feb 2011 06:29

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If you declare a variable within a scope { }, then it will only exist within it, so you'll probably want to put the declaration for 'bActive' in either the global scope, or the first non-global scope, which is 'void DarkGDK ( void ){ -> here <- }'. Can you explain why the tutorial page's code didn't work? And make sure you weren't declaring the variable multiple times, i.e. 'int xyz;' and 'int xyz;' in a different scope, because they will be treated as different variables.

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Yodaman Jer

User Banned

Posted: 4th Feb 2011 06:52 Edited at: 4th Feb 2011 06:56

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Thanks dark coder, that fixed it!

Quote: "Can you explain why the tutorial page's code didn't work?"

I'm not sure. I didn't save the code since it didn't work (I should've just to study it over and learn from it, but I was frustrated so didn't). It just kept telling me that the variables hadn't been declared in that scope (even though I typed them up in a global.h file) and it just wouldn't compile. I think I did declare a few of the same variables in different scopes, so that may have been the cause.

Thanks for the quick reply.

I'll get the hang of C++, it's just such a drastic switch from DBPro (as I'm sure you can imagine!). I already am in love with DGDK though, because it isn't giving me a crapton of errors like DBP does on Windows 7. No "Failed to AddCPicker::File" error yet.

C++ is very exciting too. I understand the basic principles of OOP and am looking forward to utilizing it for real in my future programs.

Here's my fixed code. I'm drawing things very sloppily at the moment, but I'm going to ix that with UDTs in the future as that will be easier and cleaner. This was just a quick n' dirty test.

// whenever using Dark GDK you must ensure you include the header file
#include "DarkGDK.h"

// the main entry point for the application is this function
void DarkGDK ( void )
{
	// turn on sync rate and set maximum rate to 60 fps
	dbSetDisplayMode(960,720,32);
	dbSetWindowSize(960,720);
	dbSetWindowPosition(0,0);
	dbSetWindowTitle("Main Screen");
	dbSetTextFont("microsoft sans serif");
	dbSetTextSize(12);
	dbSyncOn   ( );
	dbSyncRate ( 60 );

//declare variables
	int bActive;
	int OldMouseX;
	int OldMouseY;
	int screenWidth;
	int screenHeight;

// our main loop
	while ( LoopGDK ( ) )
	{
		dbCLS(dbRGB(0,0,0));
		//create a box
	    dbBox(dbScreenWidth()/2-122,dbScreenHeight()/2-50,dbScreenWidth()/2+122,dbScreenHeight()/2-30,dbRGB(15,15,15),dbRGB(55,55,55),dbRGB(15,15,15),dbRGB(55,55,55));
		
		//check for mouse hovering and clicking
		if (dbMouseX() > dbScreenWidth()/2-122 && dbMouseY() > dbScreenHeight()/2-50 && dbMouseX() < dbScreenWidth()/2+122 && dbMouseY() < dbScreenHeight()/2-30 && dbMouseClick()==1)
		{
			dbCenterText(dbScreenWidth()/2,dbScreenHeight()-15,"This has been clicked");
			dbBox(dbScreenWidth()/2-123,dbScreenHeight()/2-51,dbScreenWidth()/2+123,dbScreenHeight()/2-29,dbRGB(255,255,255),dbRGB(255,255,255),dbRGB(255,255,255),dbRGB(255,255,255));
			dbBox(dbScreenWidth()/2-122,dbScreenHeight()/2-50,dbScreenWidth()/2+122,dbScreenHeight()/2-30,dbRGB(55,55,55),dbRGB(15,15,15),dbRGB(55,55,55),dbRGB(15,15,15));
		}

//draw a menu if the right-button's clicked
		if (dbMouseClick()==2 && bActive==0)
		{
			bActive=1;
			OldMouseX=dbMouseX();
			OldMouseY=dbMouseY();
		}

if (bActive==1)
		{
	        dbBox(OldMouseX,OldMouseY,OldMouseX+150,OldMouseY+200,dbRGB(55,55,55),dbRGB(15,15,15),dbRGB(55,55,55),dbRGB(15,15,15));
			dbCenterText(OldMouseX+150/2,OldMouseY+5,"Item 1");
			dbCenterText(OldMouseX+150/2,OldMouseY+20,"Item 2");
			if (dbMouseClick()==1 && bActive==1) {bActive=0;}
		}

// update the screen
		dbSync ( );
	}

// return back to windows
	return;
}

+ Code Snippet

// whenever using Dark GDK you must ensure you include the header file
#include "DarkGDK.h"

// the main entry point for the application is this function
void DarkGDK ( void )
{
	// turn on sync rate and set maximum rate to 60 fps
	dbSetDisplayMode(960,720,32);
	dbSetWindowSize(960,720);
	dbSetWindowPosition(0,0);
	dbSetWindowTitle("Main Screen");
	dbSetTextFont("microsoft sans serif");
	dbSetTextSize(12);
	dbSyncOn   ( );
	dbSyncRate ( 60 );

	//declare variables
	int bActive;
	int OldMouseX;
	int OldMouseY;
	int screenWidth;
	int screenHeight;


	// our main loop
	while ( LoopGDK ( ) )
	{
		dbCLS(dbRGB(0,0,0));
		//create a box
	    dbBox(dbScreenWidth()/2-122,dbScreenHeight()/2-50,dbScreenWidth()/2+122,dbScreenHeight()/2-30,dbRGB(15,15,15),dbRGB(55,55,55),dbRGB(15,15,15),dbRGB(55,55,55));
		
		//check for mouse hovering and clicking
		if (dbMouseX() > dbScreenWidth()/2-122 && dbMouseY() > dbScreenHeight()/2-50 && dbMouseX() < dbScreenWidth()/2+122 && dbMouseY() < dbScreenHeight()/2-30 && dbMouseClick()==1)
		{
			dbCenterText(dbScreenWidth()/2,dbScreenHeight()-15,"This has been clicked");
			dbBox(dbScreenWidth()/2-123,dbScreenHeight()/2-51,dbScreenWidth()/2+123,dbScreenHeight()/2-29,dbRGB(255,255,255),dbRGB(255,255,255),dbRGB(255,255,255),dbRGB(255,255,255));
			dbBox(dbScreenWidth()/2-122,dbScreenHeight()/2-50,dbScreenWidth()/2+122,dbScreenHeight()/2-30,dbRGB(55,55,55),dbRGB(15,15,15),dbRGB(55,55,55),dbRGB(15,15,15));
		}

		
		//draw a menu if the right-button's clicked
		if (dbMouseClick()==2 && bActive==0)
		{
			bActive=1;
			OldMouseX=dbMouseX();
			OldMouseY=dbMouseY();
		}

		if (bActive==1)
		{
	        dbBox(OldMouseX,OldMouseY,OldMouseX+150,OldMouseY+200,dbRGB(55,55,55),dbRGB(15,15,15),dbRGB(55,55,55),dbRGB(15,15,15));
			dbCenterText(OldMouseX+150/2,OldMouseY+5,"Item 1");
			dbCenterText(OldMouseX+150/2,OldMouseY+20,"Item 2");
			if (dbMouseClick()==1 && bActive==1) {bActive=0;}
		}

		

		// update the screen
		dbSync ( );
	}

	// return back to windows
	return;
}

EDIT: Forgot to make sure the menu text was in the center of the menu. Quickly fixed that.

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dark coder

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Joined: 6th Oct 2002

Location: Japan

Posted: 4th Feb 2011 08:25

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Looks better, just make sure you give the variables default values, else they'll be random.

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Yodaman Jer

User Banned

Posted: 4th Feb 2011 20:32

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Thanks dark coder, I will heed that advice.

Now I seem to be having trouble with types and structs. Anytime I try to declare a type to hold information for gadget positions like this...

+ Code Snippet

struct Gadget {
    int x=0;
    int y=0;
    int w=0;
    int h=0;
    bool Visible=0;
}

...the program doesn't finish compiling. I also can't seem to reference it like this:

+ Code Snippet

button1=new Gadget;
button1.x=5;

Google's not helping much either. Here's the error report I get within VC++ 2008:

1>------ Build started: Project: Windows 95, Configuration: Debug Win32 ------
1>Compiling...
1>Main.cpp
1>c:\users\jeremy\desktop\win95mockup\windows 95\windows 95\main.cpp(29) : error C2864: 'DarkGDK::Gadget::x' : only static const integral data members can be initialized within a class
1>c:\users\jeremy\desktop\win95mockup\windows 95\windows 95\main.cpp(30) : error C2864: 'DarkGDK::Gadget::y' : only static const integral data members can be initialized within a class
1>c:\users\jeremy\desktop\win95mockup\windows 95\windows 95\main.cpp(31) : error C2864: 'DarkGDK::Gadget::w' : only static const integral data members can be initialized within a class
1>c:\users\jeremy\desktop\win95mockup\windows 95\windows 95\main.cpp(32) : error C2864: 'DarkGDK::Gadget::h' : only static const integral data members can be initialized within a class
1>c:\users\jeremy\desktop\win95mockup\windows 95\windows 95\main.cpp(33) : error C2864: 'DarkGDK::Gadget::Visible' : only static const integral data members can be initialized within a class
1>c:\users\jeremy\desktop\win95mockup\windows 95\windows 95\main.cpp(36) : error C2628: 'DarkGDK::Gadget' followed by 'int' is illegal (did you forget a ';'?)
1>c:\users\jeremy\desktop\win95mockup\windows 95\windows 95\main.cpp(36) : error C2440: 'initializing' : cannot convert from 'DarkGDK::Gadget *' to 'DarkGDK::Gadget'
1>        No constructor could take the source type, or constructor overload resolution was ambiguous
1>Build log was saved at "file://c:\Users\Jeremy\Desktop\Win95Mockup\Windows 95\Windows 95\Debug\BuildLog.htm"
1>Windows 95 - 7 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

+ Code Snippet

1>------ Build started: Project: Windows 95, Configuration: Debug Win32 ------
1>Compiling...
1>Main.cpp
1>c:\users\jeremy\desktop\win95mockup\windows 95\windows 95\main.cpp(29) : error C2864: 'DarkGDK::Gadget::x' : only static const integral data members can be initialized within a class
1>c:\users\jeremy\desktop\win95mockup\windows 95\windows 95\main.cpp(30) : error C2864: 'DarkGDK::Gadget::y' : only static const integral data members can be initialized within a class
1>c:\users\jeremy\desktop\win95mockup\windows 95\windows 95\main.cpp(31) : error C2864: 'DarkGDK::Gadget::w' : only static const integral data members can be initialized within a class
1>c:\users\jeremy\desktop\win95mockup\windows 95\windows 95\main.cpp(32) : error C2864: 'DarkGDK::Gadget::h' : only static const integral data members can be initialized within a class
1>c:\users\jeremy\desktop\win95mockup\windows 95\windows 95\main.cpp(33) : error C2864: 'DarkGDK::Gadget::Visible' : only static const integral data members can be initialized within a class
1>c:\users\jeremy\desktop\win95mockup\windows 95\windows 95\main.cpp(36) : error C2628: 'DarkGDK::Gadget' followed by 'int' is illegal (did you forget a ';'?)
1>c:\users\jeremy\desktop\win95mockup\windows 95\windows 95\main.cpp(36) : error C2440: 'initializing' : cannot convert from 'DarkGDK::Gadget *' to 'DarkGDK::Gadget'
1>        No constructor could take the source type, or constructor overload resolution was ambiguous
1>Build log was saved at "file://c:\Users\Jeremy\Desktop\Win95Mockup\Windows 95\Windows 95\Debug\BuildLog.htm"
1>Windows 95 - 7 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

All my code:

// Dark GDK - The Game Creators - www.thegamecreators.com

// the wizard has created a very simple project that uses Dark GDK
// it contains the basic code for a GDK application

// whenever using Dark GDK you must ensure you include the header file
#include "DarkGDK.h"

// the main entry point for the application is this function
void DarkGDK ( void )
{
	//set display mode, window size and text font stuff
	dbSetDisplayMode(640,480,32);
	dbSetWindowSize(640,480);
	dbSetWindowTitle("Windows 95");
	
	// turn on sync rate and set maximum rate to 60 fps
	dbSyncOn   ( );
	dbSyncRate ( 60 );

//declare all variables
    int MOUSE_CLICK=dbMouseClick();
	int OLD_CLICK=MOUSE_CLICK;
    int OldMouseX=dbMouseX();
	int OldMouseY=dbMouseY();

struct Gadget {
		int x=0;
		int y=0;
		int w=0;
		int h=0;
		bool Visible=0;
	}

int button1=new Gadget;
	button1.x=5;

// our main loop
	while ( LoopGDK ( ) )
	{
		//Clear the screen
		dbCLS();

//Draw the desktop image
		dbBox(0,0,dbScreenWidth(),dbScreenHeight(),dbRGB(0,128,128),dbRGB(0,128,128),dbRGB(0,128,128),dbRGB(0,128,128));
	   
		// update the screen
		dbSync ( );
	}

// return back to windows
	return;
}

+ Code Snippet

// Dark GDK - The Game Creators - www.thegamecreators.com

// the wizard has created a very simple project that uses Dark GDK
// it contains the basic code for a GDK application

// whenever using Dark GDK you must ensure you include the header file
#include "DarkGDK.h"

// the main entry point for the application is this function
void DarkGDK ( void )
{
	//set display mode, window size and text font stuff
	dbSetDisplayMode(640,480,32);
	dbSetWindowSize(640,480);
	dbSetWindowTitle("Windows 95");
	
	// turn on sync rate and set maximum rate to 60 fps
	dbSyncOn   ( );
	dbSyncRate ( 60 );

	//declare all variables
    int MOUSE_CLICK=dbMouseClick();
	int OLD_CLICK=MOUSE_CLICK;
    int OldMouseX=dbMouseX();
	int OldMouseY=dbMouseY();

	struct Gadget {
		int x=0;
		int y=0;
		int w=0;
		int h=0;
		bool Visible=0;
	}

	int button1=new Gadget;
	button1.x=5;

	// our main loop
	while ( LoopGDK ( ) )
	{
		//Clear the screen
		dbCLS();

	    //Draw the desktop image
		dbBox(0,0,dbScreenWidth(),dbScreenHeight(),dbRGB(0,128,128),dbRGB(0,128,128),dbRGB(0,128,128),dbRGB(0,128,128));
	   
		// update the screen
		dbSync ( );
	}

	// return back to windows
	return;
}

Can anybody help me out please? I think BASIC really screwed with mt here. C++ is so vastly different!

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Hassan

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Joined: 4th May 2009

Location: <script> alert(1); </script>

Posted: 4th Feb 2011 20:43 Edited at: 4th Feb 2011 20:44

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you cannot set the default values of struct/class members like this, i believe the common way to do it is to set default values in the constructor, for example:

+ Code Snippet

struct Gadget {
Gadget ( void ) //this is the constructor of the struct
{
//here
x = 0;
y = 0;
//etc
};
    int x;
    int y;
    int w;
    int h;
    bool Visible;
}

the constructor is called every time a new object was created of this type, for example, your button1 = new Gadget;

you can read more about constructors, just search google

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Bran flakes91093

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Joined: 13th Sep 2008

Location: Crazy Land

Posted: 4th Feb 2011 21:03

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Quote: "struct Gadget {
int x=0;
int y=0;
int w=0;
int h=0;
bool Visible=0;
}"

Errors 1-5: You can't define variables inside of a class or struct unless you make them static const. Use a constructor to initialize values.

+ Code Snippet

struct Gadget {
    Gadget() : x(0), y(0), w(0), h(0), Visible(false) { } // Initializes every new instance of the class (if a different constructor is not explicitly called)
    int x;
    int y;
    int w;
    int h;
    bool Visible;
};

Error 6: Structs and classes need semicolons after the last brace. (Fixed in the above code block).

Quote: "int button1=new Gadget;
button1.x=5;"

Error 7: new and delete are used to allocated and free memory on the heap, which does not go out of scope. These operators are to be used on pointers (declared with '*' symbol and dereferenced with "->"). However, what you want is to just create the variable on the stack, like any other variable. So remove everything after "button1" (unless you want to explicitly call a constructor other than the default: the default will be called automatically on creation).

Dynamic Memory

Structures

Fixed code:

// Dark GDK - The Game Creators - www.thegamecreators.com

// the wizard has created a very simple project that uses Dark GDK
// it contains the basic code for a GDK application

// whenever using Dark GDK you must ensure you include the header file
#include "DarkGDK.h"

// the main entry point for the application is this function
void DarkGDK ( void )
{
        //set display mode, window size and text font stuff
        dbSetDisplayMode(640,480,32);
        dbSetWindowSize(640,480);
        dbSetWindowTitle("Windows 95");
        
        // turn on sync rate and set maximum rate to 60 fps
        dbSyncOn   ( );
        dbSyncRate ( 60 );

//declare all variables
    int MOUSE_CLICK=dbMouseClick();
        int OLD_CLICK=MOUSE_CLICK;
    int OldMouseX=dbMouseX();
        int OldMouseY=dbMouseY();

struct Gadget {
		Gadget() : x(0), y(0), w(0), h(0), Visible(false) { } // Initializes variables to default values
                int x;
                int y;
                int w;
                int h;
                bool Visible;
        }

int button1; // Calls the default constructor
        button1.x=5;

// our main loop
        while ( LoopGDK ( ) )
        {
                //Clear the screen
                dbCLS();

//Draw the desktop image
                dbBox(0,0,dbScreenWidth(),dbScreenHeight(),dbRGB(0,128,128),dbRGB(0,128,128),dbRGB(0,128,128),dbRGB(0,128,128));
           
                // update the screen
                dbSync ( );
        }

// return back to windows
        return;
}

+ Code Snippet

// Dark GDK - The Game Creators - www.thegamecreators.com

// the wizard has created a very simple project that uses Dark GDK
// it contains the basic code for a GDK application

// whenever using Dark GDK you must ensure you include the header file
#include "DarkGDK.h"

// the main entry point for the application is this function
void DarkGDK ( void )
{
        //set display mode, window size and text font stuff
        dbSetDisplayMode(640,480,32);
        dbSetWindowSize(640,480);
        dbSetWindowTitle("Windows 95");
        
        // turn on sync rate and set maximum rate to 60 fps
        dbSyncOn   ( );
        dbSyncRate ( 60 );

        //declare all variables
    int MOUSE_CLICK=dbMouseClick();
        int OLD_CLICK=MOUSE_CLICK;
    int OldMouseX=dbMouseX();
        int OldMouseY=dbMouseY();

        struct Gadget {
		Gadget() : x(0), y(0), w(0), h(0), Visible(false) { } // Initializes variables to default values
                int x;
                int y;
                int w;
                int h;
                bool Visible;
        }

        int button1; // Calls the default constructor
        button1.x=5;

        // our main loop
        while ( LoopGDK ( ) )
        {
                //Clear the screen
                dbCLS();

            //Draw the desktop image
                dbBox(0,0,dbScreenWidth(),dbScreenHeight(),dbRGB(0,128,128),dbRGB(0,128,128),dbRGB(0,128,128),dbRGB(0,128,128));
           
                // update the screen
                dbSync ( );
        }

        // return back to windows
        return;
}

“C++ : Where friends have access to your private members.”
-Gavin Russell Baker

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Yodaman Jer

User Banned

Posted: 4th Feb 2011 21:29

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@Bran:

I still get errors after compiling your code. Log:

+ Code Snippet

1>------ Build started: Project: Windows 95, Configuration: Debug Win32 ------
1>Compiling...
1>Main.cpp
1>c:\users\jeremy\desktop\win95mockup\windows 95\windows 95\main.cpp(36) : error C2628: 'DarkGDK::Gadget' followed by 'int' is illegal (did you forget a ';'?)
1>c:\users\jeremy\desktop\win95mockup\windows 95\windows 95\main.cpp(54) : fatal error C1075: end of file found before the left brace '{' at 'c:\users\jeremy\desktop\win95mockup\windows 95\windows 95\main.cpp(11)' was matched
1>Build log was saved at "file://c:\Users\Jeremy\Desktop\Win95Mockup\Windows 95\Windows 95\Debug\BuildLog.htm"
1>Windows 95 - 2 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

I added a semicolon after the two braces statements and it fixed the error with the struct (I like that style btw!), but now it says this:

+ Code Snippet

1>Compiling...
1>Main.cpp
1>c:\users\jeremy\desktop\win95mockup\windows 95\windows 95\main.cpp(37) : error C2228: left of '.x' must have class/struct/union
1>        type is 'int'
1>c:\users\jeremy\desktop\win95mockup\windows 95\windows 95\main.cpp(54) : fatal error C1075: end of file found before the left brace '{' at 'c:\users\jeremy\desktop\win95mockup\windows 95\windows 95\main.cpp(11)' was matched
1>Build log was saved at "file://c:\Users\Jeremy\Desktop\Win95Mockup\Windows 95\Windows 95\Debug\BuildLog.htm"
1>Windows 95 - 2 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

What does this mean?

+ Code Snippet

error C2228: left of '.x' must have class/struct/union

Thanks for the help so far guys! I really appreciate it.

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Bran flakes91093

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Joined: 13th Sep 2008

Location: Crazy Land

Posted: 4th Feb 2011 23:10

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Oh I forgot to add the semicolon the second time.

The other error is because you need to declare button1 as type Gadget, not int.

+ Code Snippet

Gadget button1;

Sorry, I didn't have time to test what I gave you.

“C++ : Where friends have access to your private members.”
-Gavin Russell Baker

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Yodaman Jer

User Banned

Posted: 6th Feb 2011 00:07

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Thanks Bran, that now works!

I have another question.

Can I not use the std namespace with DarkGDK? I tried using it with the <string> header in order to make my buttons have text on them (as, you know, that would be useful!

), but I keep getting compiling errors. For some reason it doesn't seem to like the std namespace, but I can't use strings without it, and as far as I know there's no other way to to hold text information in DGDK, is there?

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Bran flakes91093

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Joined: 13th Sep 2008

Location: Crazy Land

Posted: 6th Feb 2011 03:53

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http://forum.thegamecreators.com/?m=forum_view&t=155298&b=22

“C++ : Where friends have access to your private members.”
-Gavin Russell Baker

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Dark GDK / New to DGDK (and some parts of C++), having trouble with variables