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GetWindowTextLength 函数
返回标识的窗口标题栏的字符个数(如果窗口有标题栏)。如果窗口是控件，返回控件文本字符个数。但是 GetWindowTextLength 函数不能返回其它应用程序的编辑框的字符个数。
函数原型：
int WINAPI GetWindowTextLength (
HWND hWnd );
参数
hWnd
类型：HWND
包含文本内容窗口或控件的窗口句柄。
返回值
类型：int
如果成功，返回复制到缓冲区的字符个数，字符个数不包括结尾的NULL空字符。如果窗口没有标题栏或文本、标题栏是空或窗口或控件句柄不可用，返回0。
此函数不能返回其它应用程序的文本个数。
此函数不能返回其它应用程序的文本个数。
备注
如果目标窗口被本进程拥有，GetWindowTextLength 会向窗口发送 WM_GETTEXTLENGTH 消息来获取文本个数。
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) |
| 库 | User32.lib |
| DLL | User32.dll |
| UNICODE版本名 | GetWindowTextLengthW |
| ANSI版本名 | GetWindowTextLengthA |
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