Dynamically linking libraries

I've searched and read. Most of everything was repetetive and I've learned this much:

Code:

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typedef VOID (*MYPROC)(LPTSTR); // <- Pt. 1
MYPROC Function;
HINSTANCE hInstLib;
hInstLib = LoadLibrary("whatever.dll");
if (hInstLib != NULL)
{
    Function = (MYPROC)GetProcAddress(hInstLib, "functionname");
    if (Function == NULL)
        return 0;
}

Function("string?");

FreeLibrary(hInstLib);

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Now, where I've labeled Pt. 1, I have a few questions. I'm just guessing here, but it looks like we're defining MYPROC to be similar to a function. Such that the VOID means the function in the dll returns nothing, and the LPTSTR is a parameter. What about more parameters? (I've never used typedef before and not too sure of its capabilities)

Code:

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typedef VOID (*MYPROC)(LPTSTR)(INT iSize);
//or
typedef VOID (*MYPROC)(LPTSTR, INT iSize);
//or can you only have one parameter?

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More questions about the dll files. What if you don't know the names of the functions? I'm hoping there might be a way to get an array of pointers to all functions. Also, what about finding the number of parameters/parameter types of a function?

It would seem that if I'm going to call a dll function, that I would know the name, parameters and what it does. But I have the urge to load random dll files, call functions and find out what they do. I know it's dangerous, but I'm in the mood to take a risk. Any information would be of great help.

The typedef is a pointer to a function.

typedef VOID (*MYPROC)(LPTSTR, int iSize);

Kuphryn

Kuphryn, thanks for clarifying that. It was my guess that with more than one parameter, you just list them like that.

I don't know about the listing of dll functions, but you don't have to create a typedef for each function:

Code:

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int (WINAPI *Func1)(int iParam1, int iParam2);//Prototype
if(((FARPROC&)Func1= GetProcAddress(h1, "Func1")))
  //Success
else
  //Fail

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you would have to for each different function that doesn't have the same prototype (return value, types of parameters, number of parameters),right?

Code:

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int (WINAPI *Func1)(int iParam1, int iParam2);//Prototype
int (WINAPI *Func2)(int iParam1);//Prototype
(FARPROC&)Func1= GetProcAddress(h1, "Func1");
(FARPROC&)Func2= GetProcAddress(h1, "Func2");

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