4 模态对话框和非模态对话框模态对话框WM_INITDIALOG 对话框初始化消息WM_SETICON 设置窗口图标
4 模态对话框和非模态对话框模态对话框DialogBox 函数 对应关闭函数 EndDialog（关闭一个模态对话框）DialogBox 函数The DialogBox macro creates a modal dialog box from a dialog box template resource. DialogBox does not return control until the specified callback function terminates the modal
