问题描述
我有代码:
......
g_hWnd = CreateWindow( L"Urok6WindowClass", L"TitleWindow", WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, rc.right - rc.left, rc.bottom - rc.top, NULL, NULL, hInstance,
NULL );
if( !g_hWnd )
return E_FAIL;
ShowWindow(g_hWnd, nCmdShow );
一切正常。但如果我添加:
All works fine. But if I add:
LPTSTR tilte_old= L"Old title";
int gettus = GetWindowText(g_hWnd, tilte_old, 100);
DWORD error = GetLastError();
WCHAR szTest[10];
swprintf_s(szTest, 10, L"%d", error);
MessageBox(NULL, szTest, L"TEST2", MB_OK);
MessageBox >> 1400
MessageBox >> 1400
gettus> >''
gettus >> ''
为什么会发生这种情况?为什么Windows句柄无效?
Why is this happening? Why windows handle is invalid?
推荐答案
的/library/windows/desktop/ms633520.aspxrel =nofollow>第二个参数是一个out参数:
The second parameter of GetWindowText
is an out parameter:
将接收文本的缓冲区。如果字符串长度大于或长于缓冲区,则字符串将被截断并以空字符结束。
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.
因此,您需要提供一个要填充的缓冲区,而不是指向常量字符串的指针(第三个参数指示最大大小缓冲区以避免溢出)
So you need to supply a buffer to be filled, not a pointer to a constant string (the third parameter indicates the maximum size of the buffer to avoid overflow)
尝试:
const size_t BUFF_SIZE = 100;
TCHAR title_old[BUFF_SIZE];
int gettus = GetWindowText(g_hWnd, title_old, BUFF_SIZE);
此外,您只需调用 GetLastError
如果 gettus
为0( GetWindowText()
失败)
Also, you only need to call GetLastError
if gettus
is 0 (GetWindowText()
failed)
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