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WM_INITDIALOG 消息
消息在对话框显示之前被发送到对话框过程。通常对话框过程使用这个消息来初始化控件和完成其它影响对话框显示的初始化任务。
应该在窗口过程 DialogProc 中处理此消息。
声明：
#define WM_INITDIALOG 0x0110
参数
wParam
接收默认键盘焦点的控件句柄。系统仅仅在对话框过程返回 TRUE 时分配默认键盘焦点。
lParam
附加初始化数据。创建对话框时应用调用者传递。对于属性单，这个参数是用来创建页面的 PROPSHEETPAGE 结构体类型指针。
返回值
类型：INT_PTR
对话框过程应该返回TRUE来指示系统去设置由wParam指定的键盘焦点。否则，应该返回FALSE阻止系统去设置默认键盘焦点。
备注
接收默认键盘焦点的控件总是对话框可见、可用且拥有WS_TABSTOP风格的第一个控件。
支持
| 最低桌面系统支持 | Windows 2000 Professional |
| 头文件 | Winuser.h (已包含在Windows.h中) |
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