#include <windows.h>

#include<stdio.h>

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,

PSTR szCmdLine, int iCmdShow)

{

static char szAppName[] = "HelloWin" ;

HWND hwnd ;

MSG msg ;

WNDCLASSEX wndclass ;

wndclass.cbSize = sizeof (wndclass) ;

wndclass.style = CS_HREDRAW | CS_VREDRAW ;

wndclass.lpfnWndProc = WndProc ;

wndclass.cbClsExtra = 0 ;

wndclass.cbWndExtra = 0 ;

wndclass.hInstance = hInstance ;

wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;

wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;

wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;

wndclass.lpszMenuName = NULL ;

wndclass.lpszClassName = szAppName ;

wndclass.hIconSm = LoadIcon (NULL, IDI_APPLICATION) ;

RegisterClassEx (&wndclass) ;

hwnd = CreateWindow (szAppName, // window class name

"Dynamischer Briefumschlag", // window caption

WS_OVERLAPPEDWINDOW, // window style

CW_USEDEFAULT, // initial x position

CW_USEDEFAULT, // initial y position

CW_USEDEFAULT, // initial x size

CW_USEDEFAULT, // initial y size

NULL, // parent window handle

NULL, // window menu handle

hInstance, // program instance handle

NULL) ; // creation parameters

ShowWindow (hwnd, iCmdShow) ;

UpdateWindow (hwnd) ;

while (GetMessage (&msg, NULL, 0, 0))

{

TranslateMessage (&msg) ;

DispatchMessage (&msg) ;

}

return msg.wParam ;

}

LRESULT CALLBACK WndProc (HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)

{

HDC hdc ;

PAINTSTRUCT ps ;

RECT rect ;

UINT ix, iy;

//char text[22]="";

switch (iMsg)

{

case WM_SIZE:

{iy=LOWORD(lParam); ix=HIWORD(lParam);}

//TextOut(hdc, 50, 300, sprintf(text, "Hallo Welt!", size), 0);

//return 0;

case WM_PAINT :

hdc = BeginPaint (hwnd, &ps) ;

GetClientRect (hwnd, &rect) ;

LineTo(hdc, iy, ix); //Die Funktionen LineTo

MoveToEx(hdc, iy,0, 0); //und MoveToEx verwirklichen

LineTo(hdc, 0, ix); //die Linien

EndPaint (hwnd, &ps) ;

return 0 ;

case WM_DESTROY :

PostQuitMessage (0) ;

return 0 ;

}

return DefWindowProc (hwnd, iMsg, wParam, lParam) ;

}