Thread: Classes and Win32 API, and another Question

>>I'm aslo wondering if all C++ is available when using win32 API<<

Yes, limited only by your compiler's capabilities.

>>Where do I define objects? In the switch() cases?<<

Without seeing more code (and use code tags please) it's almost impossible to answer. Still, taking a wild guess that the 'switch' you're referring to is a message handling switch statement within a window procedure then you can declare 'Player' with static scope at the start of the window procedure. For simplicity/testing you may wish to declare the object instance with global scope.

Enclose the case statement in chicken lips:

Code:

case WM_MBUTTONDOWN: 
  { //<--- one of these...
  Player PC; 
  PC.Age = 22;
  MessageBox(NULL, Player.Age, "Message", MB_OK);
  break;
  } //<-- ... and another

Note that the scope of the declaration (Player PC) will be local to that case statement; if you want to access the object elsewhere then you'll have to declare the object instance with static or global scope as I previously mentioned.

No matter what I do, it wont work. Here's the script..

Code:

#include <windows.h>


const char g_szClassName[] = "myClassWindow";
 


LRESULT CALLBACK WndProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{

	PAINTSTRUCT PaintStruct;
	HDC hDC;


	switch(Msg)
	{
		case WM_MBUTTONDOWN: 
						  { //<--- one of these...
					  	  Player PC;
						  PC.Age = 22;
						  MessageBox(NULL, Player.Age, "Message", MB_OK);
						  break;
						  } //<-- ... and another
		case WM_PAINT:   hDC = BeginPaint(hWnd, &PaintStruct);
					     TextOut(hDC, 10, 10, "Hi", 2);
					     EndPaint(hWnd, &PaintStruct);
					     break;
		
		case WM_CLOSE:   DestroyWindow(hWnd);
					     break;
		
		case WM_DESTROY: PostQuitMessage(0);
						 break;
		default:         return DefWindowProc(hWnd, Msg, wParam, lParam);
	}
	return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
	WNDCLASSEX wc;
	HWND hWnd;
	MSG Msg;

	// Registering Class Window
	wc.cbClsExtra			= 0;
	wc.cbSize				= sizeof(WNDCLASSEX);
	wc.cbWndExtra			= 0;
	wc.hbrBackground		= (HBRUSH) (COLOR_WINDOW+1);
	wc.hCursor				= LoadCursor(NULL, IDC_ARROW);
	wc.hIcon				= LoadIcon(NULL, IDI_APPLICATION);
	wc.hIconSm				= LoadIcon(NULL, IDI_APPLICATION);
	wc.hInstance			= hInstance;
	wc.lpfnWndProc			= WndProc;
	wc.lpszClassName		= g_szClassName;
	wc.lpszMenuName			= NULL;
	wc.style				= 0;

	if (!RegisterClassEx(&wc))
	{
		MessageBox(NULL, "Registering Class Failed!", "Message", MB_ICONEXCLAMATION | MB_OK);
		return 0;
	}

	// Creating Window
	hWnd = CreateWindowEx(WS_EX_CLIENTEDGE, g_szClassName, "World of Dragons", WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT, CW_USEDEFAULT, 800, 600, NULL, NULL, hInstance, NULL);

	if (hWnd == NULL)
	{
		MessageBox(NULL, "Creating Window Failed!", "Message", MB_ICONEXCLAMATION | MB_OK);
		return 0;
	}

	// Misc, but not last...

	ShowWindow(hWnd, nCmdShow);
	UpdateWindow(hWnd);

	while (GetMessage(&Msg, NULL, 0, 0) > 0)
	{
		TranslateMessage(&Msg);
		DispatchMessage(&Msg);
	}

	return Msg.wParam;
}

Header:

Code:

#include <iostream>

class Player
{
public:
	unsigned short int Age;
};

And last, our bugs:

Code:

C:\Program Files\Microsoft Visual Studio\MyProjects\WIN32Pract2\Main.cpp(5) : error C2146: syntax error : missing ';' before identifier 'PC'
C:\Program Files\Microsoft Visual Studio\MyProjects\WIN32Pract2\Main.cpp(5) : error C2501: 'Player' : missing storage-class or type specifiers
C:\Program Files\Microsoft Visual Studio\MyProjects\WIN32Pract2\Main.cpp(5) : fatal error C1004: unexpected end of file found

Originally Posted by philvaira

LRESULT CALLBACK WndProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{

PAINTSTRUCT PaintStruct;
HDC hDC;


switch(Msg)
{
case WM_MBUTTONDOWN:
{ //<--- one of these...
Player PC;
PC.Age = 22;
MessageBox(NULL, Player.Age, "Message", MB_OK);
break;
} //<-- ... and another

Try this:

Code:

switch(Msg)
 case WM_MBUTTONDOWN:
  {
     Player PC;
     PC.Age = 22;
     MessageBox(NULL, PC.Age, "Message", MB_OK);
  }

  break;

You haven't #included the header file which contains the definition/declaration of Player. Alternatively, just add the contents of 'header' immediately after you #include <windows.h>.

Also, you can't pass numbers to the MessageBox function; you have to convert them the strings first. For example:

Code:

case WM_MBUTTONDOWN: 
  {
  Player PC;
  PC.Age = 22;
  TCHAR chTxt[32];
  wsprintf(chTxt,TEXT("%d"),PC.Age);
  MessageBox(NULL, chTxt, "Message", MB_OK);
  break;
  }

edit: typos