windows编程--动态加载光标和图标

1. 加载光标   注意 加载光标不能发送WM_SETCURSOR 光标的位置不断变化 只在一瞬间有效
case WM_CHAR:
    {
       HICON hCursor = = LoadCursor(NULL,IDC_ARROW);   //加载标准光标
                SetClassLong(hWnd,GCL_HCURSOR,(LPARAM)hCursor);
  
     HCURSOR hCursor = LoadCursor(hInst,MAKEINTRESOURCE(IDC_CURSOR1)); //加载自定义光标
     SetClassLong(hWnd,GCL_HCURSOR,(LPARAM)hCursor);

     HCURSOR hCursor2 = LoadCursorFromFile("Cursor.cur"); //从文件加载静态光标
     SetClassLong(g_hWnd,GCL_HCURSOR,(LPARAM)hCursor2);

     HCURSOR hCursor3 = LoadCursorFromFile("Working.ani"); //从文件加载动态光标
     SetClassLong(hWnd,GCL_HCURSOR,(LPARAM)hCursor3);
    }
    break;

2.加载图标
HICON hIconN=(HICON)LoadImage(NULL,L"directx.ico",IMAGE_ICON,0,0,LR_LOADFROMFILE);
SetClassLong(DXUTGetHWND(),GCL_HICON,(LPARAM)hIconN);

动态设置图标时注意
在类的声明时把 hIconSm 设置为 NULL 如果一开始就加载图标 当只有32x32 的图标时，就无法实现动态变化图标
// wcex.hIconSm   = LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);
wcex.hIconSm = NULL;

    // HICON hIconN = LoadIcon(NULL,IDI_HAND);
             HICON hIconN = LoadIcon(hInst,MAKEINTRESOURCE(IDI_ICON2));
            
         case WM_COMMAND:
    wmId    = LOWORD(wParam);
    wmEvent = HIWORD(wParam);
    // Parse the menu selections:
    switch (wmId)
    {
     case IDM_ABOUT:
       DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About);
       break;
     case IDM_EXIT:
       DestroyWindow(hWnd);
       break;
     case IDI_ICON_C:
      SetClassLong(g_hWnd,GCL_HICON,(LPARAM)hIconN); //设置图标
      break;
            }
3. SetClassLong 函数可以修改窗口类的背景色 光标 图标 hInstance 菜单 风格 窗口过程地址
DWORD SetClassLong(
HWND hWnd,       // handle to window
int nIndex,      // index of value to change
LONG dwNewLong   // new value
);
nIndex:
GCL_HBRBACKGROUND
GCL_HCURSOR
GCL_HICON
GCL_HICONSM
GCL_HMODULE
GCL_MENUNAME
GCL_STYLE
GCL_WNDPROC

SendMessage(hWnd,WM_SETICON,ICON_BIG,hIcon);
消息的wParam参数可以是ICON_BIG或ICON_SMALL，用来指定图标的分辨率为
32×32还是16×16。