GetWindowTextA函数学习

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本文介绍了GetWindowTextA函数，该函数可将指定窗口标题栏文本复制到缓冲区，若为控件则复制其文本，但无法获取其他应用程序中控件的文本。文中说明了其语法、参数及返回值情况，若函数成功返回复制字符串长度，失败则返回零。

GetWindowTextA function

Copies the text of the specified window's title bar (if it has one) into a buffer. If the specified window is a control, the text of the control is copied. However, GetWindowText cannot retrieve the text of a control in another application.

Syntax

int GetWindowTextA(
  HWND  hWnd,
  LPSTR lpString,
  int   nMaxCount
);

Parameters

hWnd

Type: HWND

A handle to the window or control containing the text.

lpString

Type: LPTSTR

The buffer that will receive the text. If the string is as long or longer than the buffer, the string is truncated and terminated with a null character.

nMaxCount

Type: int

The maximum number of characters to copy to the buffer, including the null character. If the text exceeds this limit, it is truncated.

Return Value

Type: Type: int

If the function succeeds, the return value is the length, in characters, of the copied string, not including the terminating null character. 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. To get extended error information, call GetLastError.

This function cannot retrieve the text of an edit control in another application.