How to make MouseHookProc don't process the click - c++

Question

I'm trying to use SetWindowsHookExA() with WH_MOUSE_LL to ready low level mouse clicks that are injected.
Here is my code for hooking.
DWORD dwThreadMain; // The process main thread. (Already have this)
HWND mainWindow; // Already have this pointer
MSG hMsg;
MouseHOOK = SetWindowsHookExA(WH_MOUSE_LL, MouseHookProc, NULL, dwThreadMain);
if (!MouseHOOK) {
// Cant't Hook
}
KeyBoardHOOK = SetWindowsHookExA(WH_KEYBOARD_LL, KeyBoardHookProc, NULL, dwThreadMain);
if (!KeyBoardHOOK) {
// Cant't HOOK
}
while (GetMessage(&hMsg, mainWindow, 0, 0)) {
TranslateMessage(&hMsg);
DispatchMessage(&hMsg);
}
This is my MouseHookProc and KeyBoardHookProc:
LRESULT CALLBACK MouseHookProc(int nCode, WPARAM wParam, LPARAM lParam)
{
if (nCode == HC_ACTION) {
if (wParam == WM_RBUTTONUP || wParam == WM_RBUTTONDOWN
|| wParam == WM_LBUTTONUP || wParam == WM_LBUTTONDOWN) {
MSLLHOOKSTRUCT* hookStruct = (MSLLHOOKSTRUCT*)lParam;
if ((hookStruct->flags & LLMHF_INJECTED) == LLMHF_INJECTED) {
MessageBoxA(NULL, "MOUSE INJECTED!", "POOR MOUSE", MB_OK);
return TRUE;
}
if ((hookStruct->flags & LLMHF_LOWER_IL_INJECTED) == LLMHF_LOWER_IL_INJECTED) {
MessageBoxA(NULL, "MOUSE INJECTED!", "POOR MOUSE", MB_OK);
return TRUE;
}
}
}
return CallNextHookEx(MouseHOOK, nCode, wParam, lParam);
}
LRESULT CALLBACK KeyBoardHookProc(int nCode, WPARAM wParam, LPARAM lParam)
{
if (nCode == HC_ACTION) {
if (wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN) {
KBDLLHOOKSTRUCT* hookStruct = (KBDLLHOOKSTRUCT*)lParam;
if ((hookStruct->flags & LLKHF_INJECTED) == LLKHF_INJECTED) {
MessageBoxA(NULL, "KEYBOARD INJECTED!", "POOR KEYBOARD", MB_OK);
return TRUE;
}
if ((hookStruct->flags & LLKHF_LOWER_IL_INJECTED) == LLKHF_LOWER_IL_INJECTED) {
MessageBoxA(NULL, "KEYBOARD INJECTED!", "POOR KEYBOARD", MB_OK);
return TRUE;
}
}
}
return CallNextHookEx(KeyBoardHOOK, nCode, wParam, lParam);
}
The problem here is not on hooking, the message boxes are showing when the injected flag is there. The KeyBoard blocks the input. But only in mouse, the 'return TRUE' don't prevent the click to be processed.
I Think I've missed something... There is another way to do this?