错误 SetWindowsHookEx 和 GetRawInputData

Question

我有两个问题。

首先，我编写了一个小程序来捕获所有鼠标事件。我在一个单独的线程中启动它，但出现无法调试的错误：

#include <windows.h>
#include <iostream>
#include <thread>


HHOOK hookHandle;

LRESULT CALLBACK callBackHook(int nCode, WPARAM wParam, LPARAM lParam) {

    if(nCode == HC_ACTION) {
        std::cout << "Something!" << std::endl;
    }

    return CallNextHookEx(hookHandle, nCode,
                          wParam, lParam);
}

int mouseHook() {


    hookHandle = SetWindowsHookEx(WH_MOUSE_LL , callBackHook, NULL, 0);

    if(hookHandle == NULL) {
        std::cout << "ERROR CREATING HOOK: ";
        std::cout << GetLastError() << std::endl;
        return 0;
    }

    MSG msg;

    while(GetMessage(&msg, NULL, 0, 0) != 0) {
        std::cerr << "message!" << std::endl;
    }

    UnhookWindowsHookEx(hookHandle);

    return 0;
}

int main(int argc, char *argv[])
{
    std::thread mouse(mouseHook);
    return 0;
}

错误消息（德语按钮显示 "Cancel"、"Retry"、"Ignore"）：

其次，是否可以从callBackHook函数的lParam获取原始数据输入？我不知道如何在没有 HWND.

的情况下注册输入设备

Answer 1

首先需要等待线程退出，使用mouse.join()。如果直接主进程returns，它拥有的线程也会被终止，从而导致这个问题。

int main(int argc, char* argv[])
{
    std::thread mouse(mouseHook);
    mouse.join();
    return 0;
}

其次，

I don't know how to register an input device without an HWND

别担心，您可以为此创建一个 Message-Only Window。

示例（删除一些错误检查）：

#include <windows.h>
#include <iostream>
using namespace std;
LRESULT CALLBACK WindProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
    if (Msg == WM_INPUT)
    {
        cout << "Something!" << endl;
        HRAWINPUT hRawInput = (HRAWINPUT)lParam;
    }
    return DefWindowProc(hWnd, Msg, wParam, lParam);
}

int main()
{
    WNDCLASSEX wcx = { 0 };
    wcx.cbSize = sizeof(WNDCLASSEX);
    wcx.lpfnWndProc = WindProc;
    wcx.hInstance = GetModuleHandle(NULL);
    wcx.lpszClassName = TEXT("RawInputClass");
    RegisterClassEx(&wcx);
    HWND hWnd = CreateWindowEx(0, TEXT("RawInputClass"), NULL, 0, 0, 0, 0, 0, HWND_MESSAGE, NULL, GetModuleHandle(NULL), NULL);

    RAWINPUTDEVICE rid = { 0 };
    rid.usUsagePage = 0x01;
    rid.usUsage = 0x02; //mouse
    rid.dwFlags = RIDEV_INPUTSINK;
    rid.hwndTarget = hWnd;

    RegisterRawInputDevices(&rid, 1, sizeof(RAWINPUTDEVICE));

    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return 0;
}

错误 SetWindowsHookEx 和 GetRawInputData

Error SetWindowsHookEx and GetRawInputData

c++

winapi

runtime-error

event-handling