屏蔽按CapsLock键切换到大写时,编辑框自动弹出的提示（UnregisterClass(TOOLTIPS_CLASS)后，重新设置WndProc并注意返回值）

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WNDPROC OldProc;
LPCTSTR lpStr = TEXT("保持大写锁定打开可能会使您错误输入密码");

LRESULT CALLBACK WindowProc(
    _In_  HWND hwnd,
    _In_  UINT uMsg,
    _In_  WPARAM wParam,
    _In_  LPARAM lParam)
{
    if (uMsg == TTM_ADDTOOL)
    {
        if (_tcsncmp(((LPTOOLINFO)lParam)->lpszText, lpStr, _tcslen(lpStr))==0)
        {
            return 1;
        }

    }
    return CallWindowProc(OldProc, hwnd, uMsg, wParam, lParam);
}

int WINAPI _tWinMain(HINSTANCE hInstance, HINSTANCE /*hPrevInstance*/, LPTSTR lpstrCmdLine, int nCmdShow)
{
    WNDCLASSEX wcx = { 0 };
    GetClassInfoEx(GetModuleHandle(NULL), TOOLTIPS_CLASS, &wcx);
    UnregisterClass(TOOLTIPS_CLASS, GetModuleHandle(NULL));

    OldProc = wcx.lpfnWndProc;
    wcx.lpfnWndProc = WindowProc;
    wcx.cbSize = sizeof(wcx);
    RegisterClassEx(&wcx);
}

http://blog.csdn.net/zwfgdlc/article/details/49591315