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WM_GETTEXTLENGTH 消息
获取窗口的文本(或标题)字符个数。
WM_GETTEXT 消息可以获取窗口文本内容。
声明：
#define WM_GETTEXTLENGTH 0x000E
参数
wParam
此参数不被使用
lParam
此参数不被使用
返回值
类型：LRESULT
不包括结尾空字符，窗口文本(或标题)的字符个数。
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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