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Windows Mobile 6.5
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This function retrieves the length, in characters, of the specified window's title bar text — if the window has a title bar. If the specified window is a control, the function retrieves the length of the text within the control.

int GetWindowTextLength( 
  HWND hWnd 


[in] Handle to the window or control.

The length, in characters, of the text indicates success. Under certain conditions, this value may actually be greater than the length of the text. For more information, see the following Remarks section. Zero indicates that the window has no text. To get extended error information, call GetLastError.

If the target window is owned by the current process, GetWindowTextLength causes a WM_GETTEXTLENGTH message to be sent to the specified window or control.

To obtain the exact length of the text, use the WM_GETTEXT, LB_GETTEXT, or CB_GETLBTEXT messages, or the GetWindowText function.

Windows Embedded CEWindows CE 1.0 and later
Windows MobileWindows Mobile Version 5.0 and later

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