C# 實現螢幕鍵盤 ScreenKeyboard（四）——SendInput 模擬鍵盤輸入與按鈕點擊處理

編輯：關於C語言

鉤子 DLL 編譯與使用

將鉤子類別編譯為 DLL，應用程式引用並透過事件監聽所有鍵盤/滑鼠事件。

SendInput 模擬按鍵核心代碼


private void SendKeyDown(short key)
{
    Input[] input = new Input[1];
    input[0].type = INPUT.KEYBOARD;
    input[0].ki.wVk = key;
    input[0].ki.time = NativeMethods.GetTickCount();

    if (NativeMethods.SendInput((uint)input.Length, input, Marshal.SizeOf(input[0])) < input.Length)
        throw new Win32Exception(Marshal.GetLastWin32Error());
}

private void SendKeyUp(short key)
{
    Input[] input = new Input[1];
    input[0].type = INPUT.KEYBOARD;
    input[0].ki.wVk = key;
    input[0].ki.dwFlags = KeyboardConstaint.KEYEVENTF_KEYUP;
    input[0].ki.time = NativeMethods.GetTickCount();

    if (NativeMethods.SendInput((uint)input.Length, input, Marshal.SizeOf(input[0])) < input.Length)
        throw new Win32Exception(Marshal.GetLastWin32Error());
}

自訂 KeyboardButton 控制項點擊處理


private void ButtonOnClick(object sender, EventArgs e)
{
    KeyboardButton btnKey = sender as KeyboardButton;
    if (btnKey == null) return;
    SendKeyCommand(btnKey);
}

private void SendKeyCommand(KeyboardButton keyButton)
{
    short key = keyButton.VKCode;
    
    if (combinationVKButtonsMap.ContainsKey(key))
    {
        // 組合鍵 (Shift/Ctrl/Alt/Win)：按下/釋放切換狀態
        if (keyButton.Checked)
            SendKeyUp(key);
        else
            SendKeyDown(key);
    }
    else
    {
        // 一般鍵：完整 Down + Up 序列
        SendKeyDown(key);
        SendKeyUp(key);
    }
}