Hello,
First of all, excuse my languange, since English is no my native lang.
I try to hook the keyboard with SetWindowsHookEx() func, but something strange happened, please take a look at this code:
... HINSTANCE hInst; ... HHOOK g_hKbHook; // Hook handle HWND g_hEdit; // Handle to Edit controlwchar_t *g_pBuff; // pointer to buffer in global ...void ToggleKbHook(HWND hWnd) { ... g_hKbHook = ::SetWindowsHookEx(WH_KEYBOARD, reinterpret_cast<HOOKPROC>(KeybHookProc), hInst, ::GetCurrentThreadId()); ... } ... LRESULT CALLBACK KeybHookProc(int nCode, WPARAM wParm, LPARAM lParm) { UINT mapRes = 0;switch (static_cast<unsignedint>(wParm)) {case VK_SHIFT: ::lstrcat(g_pBuff, L"[SHIFT]");break;case VK_RETURN: ::lstrcat(g_pBuff, L"[ENTER]");break;case VK_TAB: ::lstrcat(g_pBuff, L"[TAB]");break; case VK_ESCAPE: ::lstrcat(g_pBuff, L"[ESC]");break;case VK_CAPITAL: ::lstrcat(g_pBuff, L"[CAPS]");break;default: mapRes = ::MapVirtualKey(static_cast<UINT>(wParm), MAPVK_VK_TO_CHAR);if (mapRes > 0){wchar_t res[2]; res[0] = static_cast<wchar_t>(mapRes); res[1] = L'\0'; ::lstrcat(g_pBuff, &res[0]); } elseif (mapRes == 0) { ::lstrcat(g_pBuff, L"[UNKNOWN_KEY]"); } else { } break; }if (g_hEdit){if (::lstrlen(g_pBuff) > 0){ ::SetWindowText(g_hEdit, reinterpret_cast<LPWSTR>(g_pBuff)); } }return ::CallNextHookEx(g_hKbHook, nCode, wParm, lParm); }
When I put one or more breakpoint inside function KeybHokkProc(), the programm running as I expected, Edit control display text properly, but when I remove the breakpoints Edit control show "double characters", it mean when I press character A in keyboard, the Edit control show double character A (AA).
Why is this happen ?Thanks before