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| C++ calling a dll |
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Ok lets say we have a function we want to call in C++. We
would normally do this:
/* declare the function */
int
MyFunction(char
*, int);
int
main(void)
{
return
MyFunction("hello", 5);
}
/*
our function */
int
MyFunction(char
*, int)
{
/* do something */
return 0;
}
----------------------------------------------------------------------------------
But in our case that same function is in a dll. Ok let's see how
we do it.
Your dll is located on the C:\ drive for example and is named
"MyDLL.dll". It contains a function called "MyFunction". Create
a function that calls the dll's function like so:
int
CallMyDLL(void)
{
/* get handle to dll */
HINSTANCE hGetProcIDDLL = LoadLibrary("C:\\MyDLL.dll");
/* get pointer to the function
in the dll*/
FARPROC lpfnGetProcessID = GetProcAddress(HMODULE
(hGetProcIDDLL), "MyFunction");
/*
Define the Function in the DLL for reuse. This is just
prototyping
the dll's function. A mock of it. Use "stdcall" for maximum
compatibility.
*/
typedef int (__stdcall
* pICFUNC)(char *,
int);
pICFUNC MyFunction;
MyFunction = pICFUNC(lpfnGetProcessID);
/* The actual call to the
function contained in the dll */
int
intMyReturnVal =
MyFunction("hello", 5);
/* Release the Dll */
FreeLibrary(hGetProcIDDLL);
/* The return val from the dll
*/
return
intMyReturnVal;
}
You can just copy and paste the above into your project and
change the prototyping to match your dll's function. |
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