I have a small console application with a built-in v8 engine, and I would like to add a hook for registering key events. All this worked before I used Qt and QtScript, but I port it all directly to C ++ in VC ++ 2008. The application compiles and runs, but the hook is never called, here is the corresponding code:
In main ()
HWND hwndC = GetConsoleWindow() ; HINSTANCE hInst = (HINSTANCE)GetWindowLong( hwndC, GWL_HINSTANCE ); if (SetWindowsHookEx(WH_KEYBOARD_LL, HookProc, hInst, NULL) == 0) { printf("Failed to set hook\n"); } else { printf("Hook established\n"); } g->RunScript(argc,argv);
And proc:
LRESULT CALLBACK HookProc(int nCode, WPARAM wParam, LPARAM lParam) { printf("HookProc called\n"); PKBDLLHOOKSTRUCT p = (PKBDLLHOOKSTRUCT) (lParam); if (wParam == WM_KEYDOWN) { keyDown(p,g); } else if (wParam == WM_KEYUP) { keyUp(p,g); } fflush(stdout); return CallNextHookEx(NULL, nCode, wParam, lParam); }
This is essentially an extension to shell.cc from the v8 example code. Interestingly, does this somehow block? I admit that I do not know what I'm doing here, I just play and study, but I have a dead end.
Inside keyDown I will say that I have something like this:
v8::Handle<v8::String> callback_name = v8::String::New("onKeyDown"); v8::Handle<v8::Value> callback_val = g->_context->Global()->Get(callback_name); if (!callback_val->IsFunction()) { printf("No onKeyDown handler found\n"); return; } v8::Handle<v8::Function> callback = v8::Handle<v8::Function>::Cast(callback_val); const int argc = 1; v8::Handle<v8::Value> argv[argc] = { v8::Int32::New(char(p->vkCode)) }; printf("Calling onKeyDown\n"); v8::Handle<v8::Value> result = callback->Call(g->_context->Global(), argc, argv);
In the end, some of them may not work, but it is never called when the program starts and defines: onKeyDown = function (key) {...}; I see that onKeyDown works very well, I can use all my related C ++ method, etc. From JS, so this thing is just driving me crazy.
Any help, perhaps pointers to some training materials, would be greatly appreciated.
Just to be clear, this function in c: LRESULT CALLBACK HookProc (int nCode, WPARAM wParam, LPARAM lParam) is never called or never sees printf, and the output at the beginning says: “The hook is installed, so the window says that the hook is set .
/ Jason