Error SetWindowsHookEx and GetRawInputData - c++

Question

I have two questions.
First, I wrote a little program to catch all mouse events. I start it in a separate thread, and I get a error which I can not debug:
#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;
}
Error Message (the german buttons say "Cancel", "Retry", "Ignore"):
Second, is it possible to get the raw data input from lParam of the callBackHook function? I don't know how to register an input device without an HWND.

Answer 1

First, you needs to wait the thread exit, use mouse.join(). If the main process returns directly, the thread it owns will also be terminated, which will cause this issue.
int main(int argc, char* argv[])
{
std::thread mouse(mouseHook);
mouse.join();
return 0;
}
Second,
I don't know how to register an input device without an HWND
Don't worry, you could create a Message-Only Window for that.
Sample (remove some error checking):
#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;
}