c++ - 获取 'name of the application' 以及按键

Question

为了记录按键敲击，我将钩子(Hook)安装为:

BOOL WINAPI installHook(HINSTANCE hinstDLL, DWORD fwdReason, LPVOID lpvReserved) {
handleKeyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL, LowLevelKeyboardProc, hinstDLL, 0);
MSG msg;

while(GetMessage(&msg, NULL, 0, 0)){
  TranslateMessage(&msg);
  DispatchMessage(&msg);
}
return msg.wParam;
}

static LRESULT CALLBACK LowLevelKeyboardProc(int nCode, WPARAM wParam, LPARAM lParam) {
  // write here
}

有什么方法可以知道当前正在点击按键的应用程序名称吗？就像我打开记事本写东西一样，我能否获得记事本应用程序的名称以及按键？其他一些应用程序(如 mozilla firefox)也是如此。

Answer 1

钩子(Hook)的内部应该是这样的:

static LRESULT CALLBACK LowLevelKeyboardProc(int nCode, WPARAM wParam, LPARAM lParam)
{
    // if it is not a keydown event, continue the chain
    if(HC_ACTION != nCode || WM_KEYDOWN != wParam)
        return CallNextHookEx(0, nCode, wParam, lParam);

    const KBDLLHOOKSTRUCT* messageInfo = reinterpret_cast<const KBDLLHOOKSTRUCT*>(lParam);

    // add more code here...

    // tell Windows we processed the hook
    return 1;
}

messageinfo.vkCode 将包含您要查找的键码。这些代码的官方列表位于:http://msdn.microsoft.com/en-us/library/windows/desktop/dd375731%28v=vs.85%29.aspx

键通常会输入到前景窗口中(尽管有时会出现奇怪的窗口布局)。您可以像这样获取前景窗口的标题:

TCHAR title[100]; // increase size for longer titles
GetWindowText(GetForegroundWindow(), title, 100);

如果您想获取程序的名称，请使用:

TCHAR title[100]; // increase size for longer program names
GetWindowModuleFileName(GetForegroundWindow(), title, 100);

并且，记得添加错误检查并检查文档。