[求助]对话框设置图标（左上角那个小图标）问题
我在读<<windows核心编程》22章DIPS程序时遇到的问题：<br>作者为设置对话框图标定义了一函数：<br>// Sets the dialog box icons<br>inline void chSETDLGICONS(HWND hwnd, int idi) {<br> SendMessage(hwnd, WM_SETICON, TRUE, (LPARAM) <br> LoadIcon((HINSTANCE) GetWindowLong(hwnd, GWL_HINSTANCE),MAKEINTRESOURCE(idi)));<br> SendMessage(hwnd, WM_SETICON, FALSE, (LPARAM) <br> LoadIcon((HINSTANCE) GetWindowLong(hwnd, GWL_HINSTANCE),MAKEINTRESOURCE(idi)));<br>}<br>问题一：为何用两次SendMessage(...)<br>========================================================================<br>又作者设置图标的代码：<br>BOOL Dlg_OnInitDialog(HWND hwnd, HWND hwndFocus, LPARAM lParam) {<br> chSETDLGICONS(hwnd, IDI_DIPS);<br> return(TRUE);<br>}<br>void Dlg_OnCommand(HWND hwnd, int id, HWND hwndCtl, UINT codeNotify) {<br> <br> switch (id) {<br> case IDC_SAVE:<br> case IDC_RESTORE:<br> case IDCANCEL:<br> EndDialog(hwnd, id);<br> break;<br> }<br>}<br>BOOL WINAPI Dlg_Proc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {<br><br> switch (uMsg) {<br> chHANDLE_DLGMSG(hwnd, WM_INITDIALOG, Dlg_OnInitDialog);<br> chHANDLE_DLGMSG(hwnd, WM_COMMAND, Dlg_OnCommand);<br> }<br> return(FALSE);<br>}<br>问题二：在Dlg_Proc中并未处理WM_SETICON消息，难道对话框自己处理了?<br>======================================================================================<br>问题三：我试图如下设置icon: SetClassLong(hwnd,GCL_HICON,IDI_DIPS);<br > 可是failed!窗口不是依据窗口类而来吗？设置窗口类的icon不是设置窗口属性吗？<br>页:
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