《windows程序设计》鼠标消息（12）

代码如下：

  program Project2;

  {$APPTYPE CONSOLE}

  {$R *.res}

  uses
    System.SysUtils,
    windows,
    Winapi.Messages,
    Vcl.Dialogs;

  type
    Point = record
      x: Integer;
      y: Integer;
    end;

  var
    swndClass: tagWNDCLASS;
    message: MSG;
    mHwnd: hwnd;
    cxClient, cyClient: Integer;

  function WindowProc(hwnd: hwnd; uMsg: UINT; wParam: wParam; lParam: lParam): LRESULT; stdcall;
  var
    i: integer;
    uhdc: HDC;
    ps: PAINTSTRUCT;

  begin
    case uMsg of
      WM_CREATE:
        begin

        end;
      WM_SIZE:
        begin
          cxclient := loword(lParam);
          cyclient := HiWord(lParam);
          result := 0;
          Exit;
        end;
      wm_paint:
        begin
          uhdc := BeginPaint(hwnd, ps);
          EndPaint(hwnd, ps);
          Exit;
        end;
      WM_MOUSEMOVE:
      begin
        Writeln('鼠标移动：' + HiWord(lParam).ToString + ','+loword(lParam).ToString );
      end;
      WM_LBUTTONDOWN:
      begin
        Writeln('鼠标左键按下：' + HiWord(lParam).ToString + ','+loword(lParam).ToString );
      end;
      WM_LBUTTONUP:
      begin
        Writeln('鼠标左键弹起：' + HiWord(lParam).ToString + ','+loword(lParam).ToString );
      end;
      WM_RBUTTONDOWN:
      begin
        Writeln('鼠标右键按下：' + HiWord(lParam).ToString + ','+loword(lParam).ToString );
      end;
      WM_RBUTTONUP:
      begin
        Writeln('鼠标右键弹起：' + HiWord(lParam).ToString + ','+loword(lParam).ToString );
      end;
    end;

    result := DefWindowProc(hwnd, uMsg, wParam, lParam);
  end;

  begin
    swndClass.cbClsExtra := 0; //窗口类扩展，无
    swndClass.cbWndExtra := 0; //窗口实例扩展
    swndClass.hbrBackground := COLOR_BACKGROUND; //窗口背景颜色黑色
    //LoadCursor()
    swndClass.hCursor := LoadCursor(0, IDC_ARROW); //窗口采用箭头光标
    swndClass.hIcon := LoadIcon(0, IDI_APPLICATION); //窗口最小化图标：采用缺省图标
    swndClass.hInstance := hInstance; //窗口实例句柄
    swndClass.lpfnWndProc := @WindowProc; //窗口处理函数
    swndClass.lpszClassName := 'myWnd'; //窗口类名
    swndClass.lpszMenuName := nil; //窗口菜单
    swndClass.style := CS_DBLCLKS; //窗口样式
    if RegisterClass(swndClass) = 0 then
    begin
      Writeln('windows class register error!');
      Exit;
    end;

    mHwnd := CreateWindowEx(0, 'myWnd', 'Delphi Windows', WS_OVERLAPPEDWINDOW,  {滚动条添加}
      CW_USEDEFAULT, CW_USEDEFAULT, 500, 500, HWND_DESKTOP, 0, hInstance, 0);

    ShowWindow(mHwnd, SW_SHOW);
    UpdateWindow(mHwnd);
    while GetMessage(message, 0, 0, 0) do
    begin
      TranslateMessage(message);
      DispatchMessage(message);
    end;
  end.