我正在使用ToUnicodeEx
函數,它需要鍵盤狀態作爲輸入參數。所以,我用GetKeyboardState
函數來做到這一點。但我注意到,當我輸入組合鍵如SHIFT + A有一個字符延遲。這裏是例子。GetKeyboardState一鍵延遲
AAA(控股SHIFT現在)AAAAAAAA(釋放SHIFT)AAAA級
當我在調試這個我注意到GetKeyboardState
是造成這種延遲。我該如何處理或防止這種延遲?
這是我的整個鍵盤鉤子程序。
void proc(KBDLLHOOKSTRUCT kbdStruct) {
fdebug = fopen("debug.txt", "a");
foutput= fopen("output.txt", "a");
WCHAR pwszBuff[9];
WCHAR key[9];
char str[8];
BOOL isDead = FALSE;
BYTE lpKeyState[256];
HWND currentHwnd = GetForegroundWindow();
LPDWORD currentProcessID = 0;
DWORD currentWindowThreadID = GetWindowThreadProcessId(currentHwnd, currentProcessID);
DWORD thisProgramThreadId = GetCurrentThreadId();
hkl = GetKeyboardLayout(thisProgramThreadId);
if (AttachThreadInput(thisProgramThreadId, currentWindowThreadID, TRUE))
{
GetKeyboardState(lpKeyState);
AttachThreadInput(thisProgramThreadId, currentWindowThreadID, FALSE);
}
else
{
GetKeyboardState(lpKeyState);
}
int ret = ToUnicodeEx(kbdStruct.vkCode, kbdStruct.scanCode, lpKeyState, pwszBuff, 8, 0, hkl);
fprintf(fdebug, "vkCode: %d\n", (int)kbdStruct.vkCode);
fprintf(fdebug, "ret: %d\n", (int)ret);
fprintf(fdebug, "lastIsDead: %d\n", (int)lastIsDead);
fprintf(fdebug, "lastIsMod: %d\n", (int)lastIsMod);
fprintf(fdebug, "lastVKCode: %d\n", (int)lastVKCode);
if (ret == -1) {
isDead = TRUE;
ClearKeyboardBuffer(kbdStruct.vkCode, kbdStruct.scanCode, hkl);
}
else if (ret == 0) {
}
else {
memcpy(&key, &pwszBuff, sizeof(pwszBuff));
WideCharToMultiByte(CP_UTF8, 0, key, -1, str, sizeof(str), NULL, NULL);
fprintf(fdebug, "str: %s\n", str);
}
if (lastVKCode != 0 && lastIsDead == TRUE) {
ToUnicodeEx(lastVKCode, lastScanCode, lastKeyState, pwszBuff, 4, 0, hkl);
memcpy(&key, &pwszBuff, sizeof(pwszBuff));
WideCharToMultiByte(CP_UTF8, 0, key, -1, str, sizeof(str), NULL, NULL);
fprintf(fdebug, "str: %s\n", str);
lastVKCode = 0;
}
fprintf(fdebug, "%s", "---------------------------------------------------\n");
fprintf(foutput, "LSHIFT: %d\n", (int)lpKeyState[160]);
fprintf(foutput, "RSHIFT: %d\n", (int)lpKeyState[161]);
fprintf(foutput, "%s", "---------------------------------------------------\n\n");
lastVKCode = kbdStruct.vkCode;
lastScanCode = kbdStruct.scanCode;
lastIsDead = isDead;
fclose(fdebug);
fclose(foutput);
}
這裏是更新版本hookcallback
感謝Ton Plooij。但是,我仍然有同樣的問題。
LRESULT __stdcall HookCallback(int nCode, WPARAM wParam, LPARAM lParam)
{
LRESULT ret = CallNextHookEx(_hook, nCode, wParam, lParam);
if (nCode >= 0)
{
if (wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN)
{
hookStruct = *((KBDLLHOOKSTRUCT*)lParam);
proc(hookStruct);
}
}
return ret;
}
鍵盤狀態在低級鍵盤掛鉤返回後更新。我不知道在低級鍵盤鉤子中查詢同步鍵盤狀態的方法。 – IInspectable
有什麼方法可以解決這個問題嗎?我嘗試了GetAsyncKetSatate函數,但它仍然需要鉤子返回來更新緩衝鍵狀態。 –