Calling Functions from DLL

[mesfet]

Hi All,

I have a DLL file and the *.h file which describe the functions contained in the DLL. Can anyone tell me how to call functions in the DLL in C? I am using Visual Studio? Do I need to define something "extern ....." in my program? or I need to setup the compiler......etc. It is great if anyone has some examples.


Thanks,
MESFET+

 

[samsuffy]

If you do not have the .lib file that come with the DLL, you will be obliged to load dynamically your DLL :


here is a example :
assuming you have a DLL (in the right directory) called mylib.dll with the following function
int my_fct( int a, int b)

to load & use it (it's one way to do it...)

typedef int(*my_fct_proto)( int , int );
my_fct_proto Proc_my_fct;
HINSTANCE myDllHandle;

myDllHandle = LoadLibrary("mylib");
Proc_my_fct = (my_fct_proto) GetProcAddress(myDllHandle, "my_fct");

int result = (Proc_my_fct)( 2, 3 );



note : that msdn site has more than enough info about all MS ways of coding(/thinking...)

 

[Zhasha]

if you have the *.lib file for the dll, you simply go to linker options, add the lib file to additional dependencies, #include the *.h file in your source file, and you can call the functions