能力值：
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2 楼
int lstrlen(
LPCTSTR lpString // address of string to count
);
Parameters
lpString
Points to a null-terminated string.
Return Values
If the function succeeds, the return value specifies the length of the string in bytes (ANSI version) or characters (Unicode version).
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能力值：
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3 楼
VB下的声明方式：VC请查看MSDN
Declare Function GetWindowTextLength Lib "user32" Alias "GetWindowTextLengthA" (ByVal hwnd As Long) As Long
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能力值：
( LV4，RANK：50 )
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4 楼
int GetWindowTextLength(
HWND hWnd // 含有文本的窗口或控件句柄
);
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