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Hi,
I am using Borland C++ Builder6 to create a .dll. The programm works fine but I can't use memcpy() from math.h or string.h as I get a Linker Error (Unresolved external 'memcpy' referenced)
when using it.
Does anybody have an idea of how to solve this issue?
did u add include <math.h> ?
Yes, I tried all mem.h, math.h and string.h.
As soon as I use the method I get a Linker Error.
When I create a stand alone .exe it works fine but if I want to use the same source within a .dll -> Error. :-(
Meanwhile I use my own implementation, but I am not sure if it works so faultless as the mem.h version.
memcpy(void *dest, const void *src, size_t n){
for(int i = 0; i < n; i++){
*(dest++) = *(src++);
}
}
well i dont know whats the problem exactly...can you attach your project here?Quote:
Originally Posted by Wursti
so we can take a look?
another thing instead of using your owm implementation you can try using the ::CopyMemory(..) api.
Cheers
Check your linker settings. Unresolved external symbol happens when the linker is unable to find the implementation of certain functions inside any of the library files that it is linking. It has nothing to do with inclusion of header files.
@golanshahar
I get the same error when using CopyMemory as when using memcpy.
Unfortunatly the project is to huge to poste the entire source so I just made a screen shot of the current implementation and the error I get.
@Wombat
I tryed all the linker settings. the settings work when creating a .exe. the error only occurs when creating a .dll.
I had the same error with some of my own methods in referenced files but I was able to fix them by putting a "__declspec(dllexport) __stdcall " infront of those methods.
But with memcpy I can't solve it that way.
First math.h doesn't contain dec about memcpy() functionQuote:
Originally Posted by Wursti
For this u have to use
<memory.h> or <string.h>
can u Show How and where u r including this files and what's the link error u r getting.
Maybe the Borland C++ Builder is (auto)linking some default libraries only for ".exe" projects; you can check the settings and add all the linker options used for the .exe also to your dll.
Check "Project->Options->Advanced Compiler->Output(Generate underscores)" - must be have.Quote:
Originally Posted by Wursti
Me help with memcpy() in .dll on Borland C++ Builder 6 sp4