Win32加载图片到程序中

 

//.rc
pic BITMAP "pic.bmp"

 

//.cpp

#include<windows.h>
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);

HBITMAP hBm;
BITMAP bm;
int iWindowWidth;
int iWindowHeight;
HDC hDC;
HDC hdcmem;
PAINTSTRUCT ps;

int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInst,
                   LPSTR     lpszCmdLine,
                   int       nCmdShow)
{
    HWND hwnd;
    MSG Msg;

    //用HBITMAP指向资源内的图片
    hBm = LoadBitmap(hInstance,"pic");
    //读取该图片到BITMAP结构体中
    GetObject(hBm,sizeof(BITMAP),&bm);
    //根据图片大小获取窗口大小
    iWindowWidth = bm.bmWidth;
    iWindowHeight = bm.bmHeight;

    WNDCLASS wndclass;
    char lpszClassName[]="窗口";
    char lpszTitle[]="窗口示例程序";
    wndclass.style=0;
    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=lpszClassName;
    if(! RegisterClass(&wndclass))
    {
        MessageBeep(0);
        return FALSE;
    }
    hwnd=CreateWindow(lpszClassName,
        lpszTitle,
        WS_CAPTION  |WS_SYSMENU ,
        CW_USEDEFAULT,CW_USEDEFAULT,
        iWindowWidth,iWindowHeight,
        NULL,
        NULL,
        hInstance,
        NULL);
    ShowWindow(hwnd,nCmdShow);
    UpdateWindow(hwnd);
    while(GetMessage(&Msg,NULL,0,0))
    {
        TranslateMessage(&Msg);
        DispatchMessage(&Msg);
    }
    return (int)Msg.wParam;
}


LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM
                         IParam)
{
    switch(message)
    {
    case WM_CREATE:
        //获取设备描述表
        hDC = GetDC(hwnd);
        //在内存中创建与hDC相同的设备描述表
        hdcmem = CreateCompatibleDC(hDC);
        //释放设备描述表
        ReleaseDC(hwnd,hDC);
        break;
    case WM_PAINT:
        hDC = BeginPaint(hwnd,&ps);
        //选择用图片进行绘制
        SelectObject(hdcmem,hBm);
        //显示图片从hdcmem到hDC
        BitBlt(hDC,0,0,bm.bmWidth,bm.bmHeight,hdcmem,0,0,SRCCOPY);
        EndPaint(hwnd,&ps);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
    default:
        return DefWindowProc(hwnd,message,wParam,IParam);
    }
    return(0);
}