//winapp.cpp: A Windows-program that uses TextOut.
//            Link with win.cpp

#include "win.h"
#include <stdio.h>

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, 
                   PSTR szCmdLine, int iCmdShow)
  { 
    win w(hInstance, iCmdShow, "winapp", 
          "winapp: First program with short WinMain-function");
    return w.result();
  }


LRESULT CALLBACK WndProc(HWND hWnd, UINT iMsg, 
                         WPARAM wParam, LPARAM lParam)
  { 
    switch(iMsg)
      { 
         case WM_PAINT:
           { 
             PAINTSTRUCT ps;
             HDC hDC = BeginPaint(hWnd, &ps);
             static int counter = 0;
             char buf[100];
             sprintf(buf, "There is %d times a WM_PAINT-message called.", 
                     ++counter);
             TextOut(hDC, 30, 30, buf , strlen(buf));
             sprintf(buf, "Push a mousebutton, or resize the window.");
             TextOut(hDC, 30, 50, buf, strlen(buf));
             EndPaint(hWnd, &ps);
             return 0;
          }
        case WM_LBUTTONDOWN:
          MessageBox(hWnd, "Leftmousebutton pressed", "", MB_OK);
          return 0;
        case WM_RBUTTONDOWN:
          MessageBox(hWnd, "Rightmousebutton pressed", "", MB_OK);
          return 0;
        case WM_DESTROY:
          PostQuitMessage(0);
          return 0;
     }
   return DefWindowProc(hWnd, iMsg, wParam, lParam);
  }

bcc32 -W winapp win.obj

cl /c winapp.cpp
link winapp.obj win.obj user32.lib gdi32.lib

case WM_PAINT:  
  { 
    PAINTSTRUCT ps;
    HDC hDC = BeginPaint (hWnd, &ps);

    ...

    TextOut(hDC, 30, 30, buf, strlen(buf));

    ...

    EndPaint(hWnd, &ps);
    return 0;
  }

case WM_PAINT:
  return 0;