除非移動光標，否則SendInput不會執行單擊鼠標按鈕

Question

除非移動光標，否則SendInput不會執行單擊鼠標按鈕。

我會很感激這一個幫助，因爲我似乎無法把我的頭圍繞它。

我有一個程序，在前臺窗口上執行鼠標點擊，其中我使用SendInput來模擬鼠標左鍵單擊。 問題是，如果我移動光標到點擊位置比SendInput將點擊，但是如果我不移動光標比沒有點擊甚至槽發生，我將x和y點傳遞給MouseInputData。我想在沒有實際移動光標的情況下執行鼠標左鍵單擊。

貝婁是類我有（它相當簡單，挺直向前）

namespace StackSolution.Classes 
{ 
    public static class SendInputClass 
    { 

     [DllImport("user32.dll", SetLastError = true)] 
     static extern uint SendInput(uint nInputs, ref INPUT pInputs, int cbSize); 

     [DllImport("user32.dll")] 
     static extern bool SetCursorPos(int X, int Y); 

     [DllImport("user32.dll")] 
     [return: MarshalAs(UnmanagedType.Bool)] 
     static extern bool GetCursorPos(out Point lpPoint); 



     [StructLayout(LayoutKind.Sequential)] 
     struct INPUT 
     { 
      public SendInputEventType type; 
      public MouseKeybdhardwareInputUnion mkhi; 
     } 
     [StructLayout(LayoutKind.Explicit)] 
     struct MouseKeybdhardwareInputUnion 
     { 
      [FieldOffset(0)] 
      public MouseInputData mi; 

      [FieldOffset(0)] 
      public KEYBDINPUT ki; 

      [FieldOffset(0)] 
      public HARDWAREINPUT hi; 
     } 
     [StructLayout(LayoutKind.Sequential)] 
     struct KEYBDINPUT 
     { 
      public ushort wVk; 
      public ushort wScan; 
      public uint dwFlags; 
      public uint time; 
      public IntPtr dwExtraInfo; 
     } 
     [StructLayout(LayoutKind.Sequential)] 
     struct HARDWAREINPUT 
     {   
      public int uMsg; 
      public short wParamL; 
      public short wParamH; 
     } 
     struct MouseInputData 
     { 
      public int dx; 
      public int dy; 
      public uint mouseData; 
      public MouseEventFlags dwFlags; 
      public uint time; 
      public IntPtr dwExtraInfo; 
     } 
     [Flags] 
     enum MouseEventFlags : uint 
     { 
      MOUSEEVENTF_MOVE = 0x0001, 
      MOUSEEVENTF_LEFTDOWN = 0x0002, 
      MOUSEEVENTF_LEFTUP = 0x0004, 
      MOUSEEVENTF_RIGHTDOWN = 0x0008, 
      MOUSEEVENTF_RIGHTUP = 0x0010, 
      MOUSEEVENTF_MIDDLEDOWN = 0x0020, 
      MOUSEEVENTF_MIDDLEUP = 0x0040, 
      MOUSEEVENTF_XDOWN = 0x0080, 
      MOUSEEVENTF_XUP = 0x0100, 
      MOUSEEVENTF_WHEEL = 0x0800, 
      MOUSEEVENTF_VIRTUALDESK = 0x4000, 
      MOUSEEVENTF_ABSOLUTE = 0x8000 
     } 
     enum SendInputEventType : int 
     { 
      InputMouse, 
      InputKeyboard, 
      InputHardware 
     } 

     public static void ClickLeftMouseButton(int x, int y) 
     { 
      INPUT mouseInput = new INPUT(); 
      mouseInput.type = SendInputEventType.InputMouse; 
      mouseInput.mkhi.mi.dx = x; 
      mouseInput.mkhi.mi.dy = y; 
      mouseInput.mkhi.mi.mouseData = 0; 

      //getting current cursor location 
      Point p; 
      if (GetCursorPos(out p)) 
       SetCursorPos(x, y); 


      mouseInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_LEFTDOWN; 
      SendInput(1, ref mouseInput, Marshal.SizeOf(new INPUT())); 

      mouseInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_LEFTUP; 
      SendInput(1, ref mouseInput, Marshal.SizeOf(new INPUT())); 

      //returning cursor to previous position 
      SetCursorPos(p.X, p.Y); 
     }  
    } 
    } 

相同ClickLeftMouseButton功能不會，如果我刪除越來越像光標位置點擊。

public static void ClickLeftMouseButton(int x, int y) 
     { 
      INPUT mouseInput = new INPUT(); 
      mouseInput.type = SendInputEventType.InputMouse; 
      mouseInput.mkhi.mi.dx = x; 
      mouseInput.mkhi.mi.dy = y; 
      mouseInput.mkhi.mi.mouseData = 0;      


      mouseInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_LEFTDOWN; 
      SendInput(1, ref mouseInput, Marshal.SizeOf(new INPUT())); 

      mouseInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_LEFTUP; 
      SendInput(1, ref mouseInput, Marshal.SizeOf(new INPUT()));    
     } 

在此先感謝您。

Answer 1

使用SendInput函數時，應該考慮幾件事情。

如果您未指定MOUSEEVENTF_ABSOLUTE標誌，則dx和dy（MouseInputData結構）是當前鼠標位置的相對座標。如果您指定MOUSEEVENTF_ABSOLUTE然後dx和dy是0和65535所以，如果你的X和Y座標是屏幕座標，你應該使用下面的函數來計算dx和dy之間的絕對座標：

enum SystemMetric 
{ 
    SM_CXSCREEN = 0, 
    SM_CYSCREEN = 1, 
} 

[DllImport("user32.dll")] 
static extern int GetSystemMetrics(SystemMetric smIndex); 

int CalculateAbsoluteCoordinateX(int x) 
{ 
    return (x * 65536)/GetSystemMetrics(SystemMetric.SM_CXSCREEN); 
} 

int CalculateAbsoluteCoordinateY(int y) 
{ 
    return (y * 65536)/GetSystemMetrics(SystemMetric.SM_CYSCREEN); 
} 

您發送前進一步通過SendInput的MOUSEDOWN和MouseUp事件，你必須將鼠標移動到要點擊控制：

public static void ClickLeftMouseButton(int x, int y) 
{ 
    INPUT mouseInput = new INPUT(); 
    mouseInput.type = SendInputEventType.InputMouse; 
    mouseInput.mkhi.mi.dx = CalculateAbsoluteCoordinateX(x); 
    mouseInput.mkhi.mi.dy = CalculateAbsoluteCoordinateY(y); 
    mouseInput.mkhi.mi.mouseData = 0;      


    mouseInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_MOVE |MouseEventFlags.MOUSEEVENTF_ABSOLUTE; 
    SendInput(1, ref mouseInput, Marshal.SizeOf(new INPUT())); 

    mouseInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_LEFTDOWN; 
    SendInput(1, ref mouseInput, Marshal.SizeOf(new INPUT())); 

    mouseInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_LEFTUP; 
    SendInput(1, ref mouseInput, Marshal.SizeOf(new INPUT()));    
} 

上面的代碼假定x和y是屏幕像素座標。您可以通過使用下面的代碼計算在一個winform的按鈕（目標）的座標：

Point screenCoordsCentre= 
button1.PointToScreen(new Point(button1.Width/2, button1.Height/2)); 

希望，這會有所幫助。