C++ Plugin Matrix1Util Imports - GameCreators Forum

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DigitalFury

13

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Joined: 30th Jul 2010

Location: United States

Posted: 12th Jul 2012 01:58 Edited at: 12th Jul 2012 02:00

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I'm trying to get the imports to work with my plugin and it just crashes.

I used the XN Resource Editor to get: "CALL FUNCTION NAME%S%CallFunctionName"

I noticed commands are defined differently in the plugin template like this: "?SetTexture@@YAXHH@Z"

Here is the code:

+ Code Snippet

static void (*Import3000)(LPSTR p1); // Call Function Name

#ifdef INCLUDE_MATRIX1UTIL20

HMODULE mod;

mod = GetModuleHandle("Matrix1Util_20.dll");

if (mod) {
    *((void **)&Import0) = GetProcAddress(mod, "CALL FUNCTION NAME%S%CallFunctionName");
} 

#endif

void MUCallFunctionPointer(LPSTR p1) 
{
    Import3000(p1);
}

I also made a Dependency function:

+ Code Snippet

` Dependency function: DON'T FORGET THIS!
Function Dependency()
   x = Object Exist(1)    `Include Basic3D
   x = Sprite Exist(1)    `Include 
   x = Particles Exist(1)    `Include 
   x = Vector Exist(1)    `Include 
   x = Memblock Exist(1)    `Include 
   x = Camera Exist(1)    `Include 
   x = Image Exist(1)    `Include 
   x = Effect Exist(1)    `Include 
   x = Sound Exist(1)    `Include 
   x = Mesh Exist(1)    `Include 
   x = Music Exist(1)    `Include 
   x = File Exist("")    `Include 
   x = Matrix Exist(1)    `Include 
   x = Dll Exist(1)    `Include 
   x = Timer()
   x$ = Get Function Name$(1)   
   Call Function Name "NULL"
EndFunction

Any ideas why it is crashing or what I could do to get it to work? My code seems fine and I followed the same way everything is defined in the plugin template.

Thanks,

DigitalFury

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Diggsey

17

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Joined: 24th Apr 2006

Location: On this web page.

Posted: 12th Jul 2012 02:00

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The exported function name is the third part of the line in the string table, not the whole line, so in this case it would be "CallFunctionName":

+ Code Snippet

*((void **)&Import0) = GetProcAddress(mod, "CallFunctionName");

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DigitalFury

13

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Joined: 30th Jul 2010

Location: United States

Posted: 12th Jul 2012 02:05 Edited at: 12th Jul 2012 02:07

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I tried it but it still crashes...

DBP Code:

+ Code Snippet

GP Call Function "MyLoop"
End

Function MyLoop()
	Print RND(1000)
EndFunction

` Dependency function: DON'T FORGET THIS!
Function Dependency()
   x = Object Exist(1)    `Include Basic3D
   x = Sprite Exist(1)    `Include 
   x = Particles Exist(1)    `Include 
   x = Vector Exist(1)    `Include 
   x = Memblock Exist(1)    `Include 
   x = Camera Exist(1)    `Include 
   x = Image Exist(1)    `Include 
   x = Effect Exist(1)    `Include 
   x = Sound Exist(1)    `Include 
   x = Mesh Exist(1)    `Include 
   x = Music Exist(1)    `Include 
   x = File Exist("")    `Include 
   x = Matrix Exist(1)    `Include 
   x = Dll Exist(1)    `Include 
   x = Timer()
   x$ = Get Function Name$(1)   
   Call Function Name "NULL"
EndFunction

Revised C++ Code:

+ Code Snippet

static void (*Import3000)(LPSTR p1); // Call Function Name

#ifdef INCLUDE_MATRIX1UTIL20
#define INCLUDE_MATRIX1UTIL20

HMODULE mod;

mod = GetModuleHandle("Matrix1Util_20.dll");

if (mod) {
    *((void **)&Import3000) = GetProcAddress(mod, "CallFunctionName"); // CALL FUNCTION NAME%S%CallFunctionName
} 

#endif

void MUCallFunctionPointer(LPSTR p1) 
{
    Import3000(p1);
}

Thanks,

DigitalFury

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Diggsey

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Joined: 24th Apr 2006

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Posted: 12th Jul 2012 02:31

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You have to put the code to get the function pointer in an initialisation function, also why do you have those precompiler commands? At the moment your code will be precompiled to this:

+ Code Snippet

static void (*Import3000)(LPSTR p1); // Call Function Name

void MUCallFunctionPointer(LPSTR p1) 
{
    Import3000(p1);
}

Which of course will crash because Import3000 is always null.

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DigitalFury

13

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Joined: 30th Jul 2010

Location: United States

Posted: 12th Jul 2012 02:42

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Changes I've made:

Revised DBP Code:

+ Code Snippet

GP Setup

GP Call Function "MyLoop"
End

Function MyLoop()
	Print RND(1000)
EndFunction

` Dependency function: DON'T FORGET THIS!
Function Dependency()
   x = Object Exist(1)    `Include Basic3D
   x = Sprite Exist(1)    `Include 
   x = Particles Exist(1)    `Include 
   x = Vector Exist(1)    `Include 
   x = Memblock Exist(1)    `Include 
   x = Camera Exist(1)    `Include 
   x = Image Exist(1)    `Include 
   x = Effect Exist(1)    `Include 
   x = Sound Exist(1)    `Include 
   x = Mesh Exist(1)    `Include 
   x = Music Exist(1)    `Include 
   x = File Exist("")    `Include 
   x = Matrix Exist(1)    `Include 
   x = Dll Exist(1)    `Include 
   x = Timer()
   x$ = Get Function Name$(1)   
   Call Function Name "NULL"
EndFunction

String Table:

+ Code Snippet

4 "GP Setup%0%SetupPerformance"    // DLLCMDC void SetupPerformance()

New Function to Init:

+ Code Snippet

DLLCMDC void SetupPerformance()
{
     static void (*Import3000)(LPSTR p1); // Call Function Name
}

Still didn't work. It still crashes for some reason. I know that MyLoop exists and everything.

Thanks,

DigitalFury

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Diggsey

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Joined: 24th Apr 2006

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Posted: 12th Jul 2012 04:55

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In your code:

+ Code Snippet

DLLCMDC void SetupPerformance()
{
     static void (*Import3000)(LPSTR p1); // Call Function Name
}

Import3000 will not be accessible outside the function "SetupPerformance()" so there's no way you can call it, and you still aren't assigning it inside the SetupPerformance() function. Also there's no way your new code will compile unless you still have the precompiler problems, although seeing the whole code is necessary to be sure.

I think you need to learn a bit more about C++, perhaps try some tutorials?

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DigitalFury

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Location: United States

Posted: 12th Jul 2012 05:05 Edited at: 12th Jul 2012 05:08

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@Diggsey - I took advanced c++ a few years ago but forgot a lot of it. I'm still a little confused of how you want me to define Import3000. I don't know how to use function pointers. I did some research online and I came up with something but I don't know if it is right.

Do you mean something like:

+ Code Snippet

DLLCMDC void SetupPerformance()
{
Import3000 = &MUCallFunctionPointer;
}

Right? Also, it still crashes with this.

Thanks,

DigitalFury

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Diggsey

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Posted: 12th Jul 2012 05:41

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+ Code Snippet

static void (*Import3000)(LPSTR p1); // Call Function Name

DLLCMDC void SetupPerformance()
{
    HMODULE mod;

    mod = GetModuleHandle("Matrix1Util_20.dll");

    if (mod) {
        *((void **)&Import3000) = GetProcAddress(mod, "CallFunctionName"); // CALL FUNCTION NAME%S%CallFunctionName
    }
}

void MUCallFunctionPointer(LPSTR p1) 
{
    Import3000(p1);
}

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DigitalFury

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Joined: 30th Jul 2010

Location: United States

Posted: 12th Jul 2012 05:54 Edited at: 12th Jul 2012 06:04

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@Diggsey - Oo duh I should have notice that. In the plugin template he doesn't do that and I just copied off of his code. I don't know how his code works because it won't execute.

It works though!

Thanks so much,

DigitalFury

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