Linker Error using DLLs - GameCreators Forum

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Amnzero

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Joined: 1st Aug 2009

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Posted: 4th Feb 2010 08:08

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Error 1 error LNK2019: unresolved external symbol "unsigned long __cdecl dbCallDLL(int,unsigned long)" (?dbCallDLL@@YAKHK@Z) referenced in function "public: void __thiscall DllObj::Call(char *)" (?Call@DllObj@@QAEXPAD@Z) DllObj.obj
Error 2 error LNK2019: unresolved external symbol "unsigned long __cdecl dbCallDLLX(int,unsigned long,unsigned long,unsigned long)" (?dbCallDLLX@@YAKHKKK@Z) referenced in function "public: unsigned long __thiscall DllObj::Call(char *,char *,int)" (?Call@DllObj@@QAEKPAD0H@Z) DllObj.obj
Error 3 error LNK2019: unresolved external symbol "int __cdecl dbDLLCallExist(int,unsigned long)" (?dbDLLCallExist@@YAHHK@Z) referenced in function "public: int __thiscall DllObj::CallExists(char *)" (?CallExists@DllObj@@QAEHPAD@Z) DllObj.obj
Error 4 fatal error LNK1120: 3 unresolved externals

Im not sure if this is due to the way I am defining these functions or if there is an issue somewhere else, that I am not seeing. Let me know if you have any light to shed on this.

DllObj.h

+ Code Snippet

	/*void Call(char* function);

	DWORD Call(char* function, char* data, int numofparam);

	int CallExists(char* function);*/

DllObj.cpp

+ Code Snippet

/*void DllObj::Call(char* function)
{
	dbCallDLL(this->ID, (DWORD)function);
}

DWORD DllObj::Call(char* function, char* data, int numofparam)
{
	return dbCallDLLX(this->ID, (DWORD)function, (DWORD)data, (DWORD)&numofparam);
}

int DllObj::CallExists(char* function)
{
	return dbDLLCallExist(this->ID, (DWORD)function);
}*/

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bloodmage2

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Joined: 14th Jun 2009

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Posted: 4th Feb 2010 17:55

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this is saying that something is declared like:
class testClass {
void testFunction(int testParameter);
}

but never defined like:

void testClass::testFunction(int testParameter) {
//code
}

make sure all libaries are included with #include 's and in the project properties menu -> library and include directories dialog.

-to the optimist, the glass is half full. to the pessimist, it is half empty, to the engineer, it is twice as big as it needs to be.

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Bran flakes91093

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Posted: 4th Feb 2010 21:25

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Put

#include "DllObj.h"

in DllObj.cpp

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Amnzero

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Posted: 6th Feb 2010 01:10

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Quote: "#include "DllObj.h""

Yes. I only gave you the lines from the files that I was getting the errors from. This is included already.

Quote: "make sure all libaries are included with #include 's and in the project properties menu -> library and include directories dialog."

Well I was assuming that all of that was included when I included DarkGDK.h, which is why I don't understand the problem I am having here, since clearly the functions are declared, and defined. I dunno. I am not even sure where to start on this one. All I can think is that the functions i am trying to wrap need to be user defined, and are only declared by the GDK? I dunno, I have never used these functions before. I am just trying to wrap all the GDK functions into a class library.

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Caleb1994

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Joined: 10th Oct 2008

Location: The Internet you idiot!

Posted: 7th Feb 2010 04:05 Edited at: 7th Feb 2010 04:07

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Are you including DarkGDK.h in DllObj.cpp?

Quote: "libaries are included with #include 's"

I think you mean "Headers are included with #includes's"

and it's only one header. DarkGDK.h

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Amnzero

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Posted: 7th Feb 2010 15:29

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Quote: ""Headers are included with #includes's""

I beleive its #includes'

Quote: "Are you including DarkGDK.h in DllObj.cpp?"

Im including it it DllObj.h which should be included in DllObj.cpp by proxy right? I mean it has not given me a problem with any of the other DGDK functions yet. Just these three.

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Dark GDK / Linker Error using DLLs