Void* to HWND__ *??

(WinXP, Borland C++ Free Command Line Compiler)
Ok, something very strange is going on in my code. This should place a .mid, and return a handle:

Code:

---

#include <windows>
#include <string>
#include <iostream>
using namespace std;

HANDLE Order(SHORT order, string PATH) {
 string Muz;
 HANDLE Handler;

 if(order == 0)
  Muz+="play ";
 else
  Muz+="stop ";

 Muz+=PATH;
 cout << Muz << endl;

 mciSendString(Muz.c_str(), NULL, 0, Handler);

 return Handler;
}

int main() {
 Order(0, "C:\\TW.mid");

 Sleep(4500);

 Order(1, "C:\\TW.mid");
}

---

But I get something about casting from a void pointer to an HWND__ pointer...

Code:

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C:\Borland\BCC55\Bin>BCC32 C:\SoundTest.cpp
Borland C++ 5.5.1 for Win32 Copyright (c) 1993, 2000 Borland
C:\SoundTest.cpp:
Error E2034 C:\SoundTest.cpp 18: Cannot convert 'void *' to 'HWND__ *' in function Order(short,string)
Error E2342 C:\SoundTest.cpp 18: Type mismatch in parameter 'hwndCallback' (wanted 'HWND__ *', got 'void *') in function Order(short,string)
*** 2 errors in Compile ***

---

Why is it even bringing this up? It does want a HANDLE doesnt it? I've never had this problem before... :/. Whats it want me to do >.>. Oh, and what is that handle for anyways? I know I could specify a NULL, but is it used for something?

Thanks!

It looks like NULL is defined as

Code:

---

(void *)0

---

on your compiler (even though it shouldn't be). Try casting the NULL to whatever the function's excepting (HANDLE ** or whatever).

Or maybe the error is referring to the last parameter.

You might need WinMain().

Weird, I changed HANDLE Handler to HWND__* Handler and it worked... Isint an HWND__ a HANDLE? Maybe its a compiler bug?

The function actually expects a HWND. The documentation is incorrect. However, there's more to calling a function than just getting the types to match. You also need an appropriate value. This last value can take a window handle, to which notifications will be sent. In your case, since you don't wish to receive notification messages, you can use the value NULL.