#include <windows.h>

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);
DWORD WINAPI ThreadProc (LPVOID);

int APIENTRY WinMain(HINSTANCE hInstance,
					 HINSTANCE hPrevInstance,
					 LPSTR lpCmdLine,
					 int nCmdShow)

{
    WNDCLASS WndClass;
	WndClass.style =0;
    WndClass.cbClsExtra =0;
    WndClass.cbWndExtra =0;
    WndClass.lpfnWndProc = WndProc;
    WndClass.hInstance = hInstance;
	WndClass.hbrBackground = (HBRUSH) (COLOR_WINDOW+1);
	WndClass.hCursor = LoadCursor (NULL, IDC_ARROW);
	WndClass.hIcon = LoadIcon (NULL, IDI_APPLICATION);
	WndClass.lpszMenuName =0;
	WndClass.lpszClassName = "Thread2";

	RegisterClass(&WndClass);

	HWND hWindow,hButton;

	hWindow = CreateWindow("Thread2","Thread-Fenster",
		                    WS_OVERLAPPEDWINDOW,
							0,0,400,400,NULL,NULL,
							hInstance,NULL);

	hButton = CreateWindow("BUTTON","Start Thread 2",WS_CHILD|WS_VISIBLE|BS_PUSHBUTTON,
							10,200,200,20,hWindow,(HMENU) 1,hInstance,NULL);
	hButton = CreateWindow("BUTTON","Ende Thread 2",WS_CHILD|WS_VISIBLE|BS_PUSHBUTTON,
							10,240,200,20,hWindow,(HMENU) 2,hInstance,NULL);

	ShowWindow (hWindow, nCmdShow);

	UpdateWindow (hWindow);

	MSG Message;
	while (GetMessage(&Message,NULL,0,0))
	{
		DispatchMessage(&Message);
	}
	return (Message.wParam);

}
DWORD WINAPI ThreadProc(LPVOID pvoid)
{
	int wert = 2;
	while(wert==2)
	{
		HDC hdc1;
		hdc1 = GetDC(hWindow);
		Rectangle(hdc1,rand()%200,rand()%200,rand()%200,rand()%200);
		ReleaseDC(hWindow,hdc1);
	}
	return 0;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT uiMessage,
						 WPARAM wParam,LPARAM lParam)
{
	static HANDLE hThread;
	switch(uiMessage)
	{
	case WM_COMMAND:
		if (HIWORD(wParam)==BN_CLICKED)
		{
			if (LOWORD(wParam)==1)
			{
				DWORD dwThreadParam = 1;
				DWORD dwThreadID;
				hThread = CreateThread(NULL,0,ThreadProc,&dwThreadParam,0,&dwThreadID);
			}
			if (LOWORD(wParam) == 2)
			{
				TerminateThread(hThread,0);
			}

		}
		return 0;

    case WM_DESTROY:
		PostQuitMessage(0);
		return 0;
	default:
		return DefWindowProc (hWnd, uiMessage,
								wParam, lParam);
}
}

P.S.: Bitte nicht zu schwierig erklären!

Gruß

sollte global sein oder parameter mit an den thread übergeben werden.
wobei zweite variante die schönere und imho die bessere ist.

Aber wie soll ich hWindow als Parameter übergeben. Ich habe das mal versucht, aber er macht es irgendwie nicht.

DWORD WINAPI ThreadProc(LPVOID pvoid)
{
HWND hWindow = (HWND)pvoid;
}
[/cpp]

Gruß