位图载入与位图移动

//windows.h文件中包含应用程序中所需的数据类型和数据结构的定义
#include <windows.h>
#include <stdlib.h>
#include <time.h>
#include "menu_3.h"
#include <math.h>

HBITMAP hBm;

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);//窗口函数说明
//---------以下初始化窗口类--------------
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInst,LPSTR lpszCmdLine,int nCmdShow)
{
    HWND hwnd;
    MSG Msg;
    WNDCLASS wndclass;
    hBm = LoadBitmap(hInstance, MAKEINTRESOURCE(IDB_BITMAP));
    char lpszClassName[] = "窗口";     //窗口类名
    char lpszTitle[] = "My_Windows";    //窗口标题名

    //窗口类的定义
    wndclass.style = CS_HREDRAW | CS_VREDRAW;                  //窗口类型为默认类型
    wndclass.lpfnWndProc = WndProc;      //窗口处理函数为WndProc
    wndclass.cbClsExtra = 0;             //窗口类无扩展
    wndclass.cbWndExtra = 0;             //窗口实例无扩展
    wndclass.hInstance = hInstance;     //当前实例句柄

    wndclass.hIcon = LoadIcon(NULL,IDI_APPLICATION);//窗口的最小化图标为默认图标
    wndclass.hCursor = LoadCursor( NULL, IDC_ARROW); //窗口 采用箭头光标
    wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); //窗口 背景为 白色
    wndclass.lpszMenuName = "menu3" ; //窗口 中无菜单
    wndclass.lpszClassName = lpszClassName; //窗口类名为“窗口示例”
//-----------以下进行窗口类的注册
    if (!RegisterClass(&wndclass))//如果注册失败则发出警吿声音
    {
        MessageBeep (0);
        return FALSE;
    }

//创建窗口
    hwnd = CreateWindow(
                        lpszClassName, //窗口类名
                        lpszTitle,      //窗口实例的标题名
                        WS_OVERLAPPEDWINDOW, //窗口 的风格
                        CW_USEDEFAULT,
                        CW_USEDEFAULT,  //窗口左上角坐标为默认值
                        CW_USEDEFAULT,
                        CW_USEDEFAULT,  //窗口的髙和宽为默认值
                        NULL,           //此窗口无父窗口
                        NULL,           //此窗口无主菜单
                        hInstance,      //创建此窗口应用程序的当前句柄
                        NULL            //不使用该值
                        );

    ShowWindow( hwnd, nCmdShow);        //显示窗口
    UpdateWindow(hwnd);                 //绘制用户区
    while( GetMessage(&Msg, NULL, 0, 0)) //消息循环
    {
        TranslateMessage(&Msg);
        DispatchMessage(&Msg);
    }
    return Msg.wParam;                  //程序终止时将信息返回系统
}

//窗口函数
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    HDC hDC, hdc_old;
    HBITMAP hBmp, hBkBmp;
    static HDC hdcmem;
    RECT rect;
    HPEN hPen;
    BITMAP bm;
    PAINTSTRUCT ps;
    static int mx, my;
    static bool isLeft = false, isRight = false, isUp = false, isDown = false, isOut = false;
    COLORREF color[7] = {RGB(255,0,0), RGB(255,165,0), RGB(255,255,0), RGB(0,255,0), RGB(0,255,255), RGB(0,0,255), RGB(139,0,255)};
    static int x, y;
    switch(message)
    {
    case WM_MOUSEMOVE:
        mx = LOWORD(lParam);
        my = HIWORD(lParam);
        return 0;
    case WM_LBUTTONDOWN:
        if (mx <= x)
            isLeft = true;
        else if (mx >= x+500)
            isRight = true;
        else if (my <= y)
            isUp = true;
        else if (my >= y+541)
            isDown = true;
        InvalidateRect(hWnd, NULL,1);
        return 0;
    case WM_CHAR:
        if (wParam == 'A' || wParam == 'a' )
            isLeft = true;
        else if (wParam == 'd' || wParam == 'D' )
            isRight = true;
        else if(wParam == 'w' || wParam == 'W')
            isUp = true;
        else if(wParam == 's' || wParam == 'S' )
            isDown = true;
        InvalidateRect(hWnd, NULL, 1);
        return 0;
    case WM_KEYUP:
        InvalidateRect(hWnd, NULL, 1);
        return 0;
    case WM_ERASEBKGND:
        return 1;
    case WM_CREATE:
        hDC=GetDC(hWnd);
        hdcmem=CreateCompatibleDC(hDC);
        ReleaseDC(hWnd, hDC);
        return 0;
    case WM_PAINT:
        hdc_old = BeginPaint(hWnd, &ps);
        hDC = CreateCompatibleDC(hdc_old);
        GetClientRect(hWnd,&rect);
        hBmp = CreateCompatibleBitmap(hdc_old,rect.right,rect.bottom);
        SelectObject(hDC,hBmp);
        hPen = CreatePen(PS_SOLID, 1, RGB(255,255,255));
        SelectObject(hDC, hPen);
        Rectangle(hDC, rect.left, rect.top, rect.right, rect.bottom);
        DeleteObject(hPen);
        SelectObject(hdcmem, hBm);
        GetObject(hBm, sizeof(BITMAP), &bm);
        if (isLeft)
        {
            if (x <= 0)
                isOut = true;
            else
                x -= 10;
        }
        else if (isRight)
        {
            if (x >= rect.right-500)
                isOut = true;
            else
                x += 10;
        }
        else if (isUp)
        {
            if (y <= 0)
                isOut = true;
            else
                y -= 10;
        }
        else if (isDown)
        {
            if (y >= rect.bottom-541)
                isOut = true;
            else
                y += 10;
        }
        isLeft = isRight = isUp = isDown = isOut = false;
        BitBlt(hDC, x, y, bm.bmWidth, bm.bmHeight,hdcmem,0,0,SRCCOPY);

        BitBlt(hdc_old,0,0,rect.right,rect.bottom,hDC,0,0,SRCCOPY);
        DeleteObject(hBmp);
        DeleteDC(hDC);
        ReleaseDC(hWnd, hDC); //释放
        EndPaint(hWnd, &ps); //结束缓制
        return 0;

    case WM_DESTROY:
        DeleteObject(hBm);
        PostQuitMessage(0);                 //调用 PostQuitMessage 发出 WM_QUIT 消息

        return 0;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam); //默认时采用系统消息默认处理函数

    }

}