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Код

#include <windows.h>

#define ID_Edit 101
HINSTANCE hInst;

LONG WINAPI WndProc(HWND, UINT, WPARAM,LPARAM);
HWND b1hwnd,b2hwnd;
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)

{
   
    
    
    


    HWND hwnd;
    MSG msg;
    WNDCLASS w;
    
    memset(&w,0,sizeof(WNDCLASS));
    
    w.style = CS_HREDRAW | CS_VREDRAW;
    w.hCursor=LoadCursor(NULL,IDC_ARROW);
    w.lpfnWndProc = WndProc;
    w.hInstance = hInstance;
    w.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    w.lpszClassName = "My Class";
    
    RegisterClass(&w);
    
    
    hwnd = CreateWindow("My Class", "First window", WS_OVERLAPPEDWINDOW,0, 0, 600, 350, NULL, NULL, hInstance, NULL);
    
    
    b1hwnd=CreateWindow("button", "Press me", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 10, 10, 80, 30, hwnd, (HMENU)10000, hInstance, NULL);

    
      
      ShowWindow(hwnd,nCmdShow);
      UpdateWindow(hwnd);
    
    while(GetMessage(&msg,NULL,0,0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return msg.wParam;
};


LONG WINAPI WndProc(HWND hwnd, UINT Message, WPARAM wparam, LPARAM lparam)
{


static HWND hEditWnd;
RECT Rect1;

HDC hDC,hCompatileDC;
PAINTSTRUCT PaintStruct;
HANDLE hBitmap,hOldBitmap,hBitmap1;
RECT Rect;
BITMAP Bitmap;
  

char* str;

     str="3.bmp";
switch (Message){
   
 
    
    
    
    case WM_DESTROY: 
        PostQuitMessage(0);
        break;

       
      case WM_PAINT:
          
            hDC=BeginPaint(hwnd,&PaintStruct);
                             
            hBitmap=LoadImage(NULL,str,IMAGE_BITMAP,0,0,LR_LOADFROMFILE);
            GetObject(hBitmap,sizeof(BITMAP),&Bitmap);            
    
            hCompatileDC=CreateCompatibleDC(hDC);
            hOldBitmap=SelectObject(hCompatileDC,hBitmap);
    
            GetClientRect(hwnd,&Rect);
                
            StretchBlt(hDC,0,0,Rect.right,Rect.bottom,hCompatileDC,0,0,Bitmap.bmWidth,Bitmap.bmHeight,SRCCOPY);
                            
            SelectObject(hCompatileDC,hOldBitmap);
            DeleteObject(hBitmap);
            DeleteDC(hCompatileDC);
            EndPaint(hwnd,&PaintStruct);
        return 0;
        break;

    
    case WM_COMMAND:
        
        if((HWND) lparam==b1hwnd)  {
            
          str="4.bmp";        
        InvalidateRect(hwnd,NULL,TRUE); 
        
      
        }
        
        break; 
    
    default:
        return DefWindowProc(hwnd, Message, wparam, lparam);
    }
    return 0;
}