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WM_GETTEXT 消息
复制窗口文本到调用者提供的缓冲区。
GetWindowText 函数也可以实现部分功能的获取窗口或控件文本内容。
声明：
#define WM_GETTEXT 0x000D
参数
wParam
包括结尾空字符在内的，可以被复制的最大字符个数。
lParam
接收文本的缓冲区指针。
返回值
类型：LRESULT
不包括结尾空字符，被复制的文本字符个数。
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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