This behavior can occur when an application uses both ANSI functions and common dialogs, which use Unicode. The return value, however, will always be at least as large as the actual length of the text you can thus always use it to guide buffer allocation. This occurs with certain mixtures of ANSI and Unicode, and is due to the system allowing for the possible existence of double-byte character set (DBCS) characters within the text. Under certain conditions, the GetWindowTextLength function may return a value that is larger than the actual length of the text. 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 determine success or failure, clear the most recent error information by calling SetLastError with 0, then call GetLastError. If you do not have a header file and import library for this function, you can call the function using LoadLibrary and GetProcAddress.This function does not clear the most recent error information. This function was not included in the SDK headers and libraries until Windows XP with Service Pack 1 (SP1) and Windows Server 2003. To get extended error information, call GetLastError. If the window has no title bar or text, if the title bar is empty, or if the window or control handle is invalid, the return value is zero. If the function succeeds, the return value is the length, in characters, of the copied string, not including the terminating null character. If the text exceeds this limit, it is truncated. The maximum number of characters to be copied to the buffer, including the null character. If the string is as long or longer than the buffer, the string is truncated and terminated with a null character. Syntax int InternalGetWindowText(Ī handle to the window or control containing the text. Specified window is a control, the text of the control is obtained. Text by sending the window a WM_GETTEXT message. This is unlike GetWindowText which obtains the However, it obtains the window text directly from the window structureĪssociated with the specified window's handle and then always provides the text as a This function is similar to the GetWindowText function. Ĭopies the text of the specified window's title bar (if it has one) into a buffer.
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