Win32 和 Win64 机器中的 SendInput 按键

我在 xp 32 位下使用 sendInput() 使用 web 服务来推送当前焦点窗口的 F​​5。现在在 Vista win64 下我无法获得这个结果。有些文章指出使用 4 位或 8 位的 uint 问题，但这并不能通过差异编译和 FieldOffset(4) 或 (8) 解决 vista 下的问题。其他人谈到使用此 SendInput() 方法在 Vista 屏幕和窗口之间不再有交互。有人可以指出在 win32 和 win64 机器上按 F5 的解决方案吗？谢谢。

uint intReturn = 0;
NativeWIN32.INPUT structInput;
structInput = new NativeWIN32.INPUT();
structInput.type = (uint)1;
structInput.ki.wScan = 0;
structInput.ki.time = 0;
structInput.ki.dwFlags = 0;
structInput.ki.dwExtraInfo = IntPtr.Zero; 

// Key down the actual key-code 
structInput.ki.wVk = (ushort)NativeWIN32.VK.F5;
//vk; 
intReturn = NativeWIN32.SendInput((uint)1, ref structInput, Marshal.SizeOf(structInput));
// Key up the actual key-code 
structInput.ki.dwFlags = NativeWIN32.KEYEVENTF_KEYUP;
structInput.ki.wVk = (ushort)NativeWIN32.VK.F5;
//vk; 
intReturn = NativeWIN32.SendInput((uint)1, ref structInput, Marshal.SizeOf(structInput));



public class NativeWIN32
{ 
    public const ushort KEYEVENTF_KEYUP = 0x0002; 
    public enum VK : ushort 
    {  
        F5                   = 0x74,  
    } 

    public struct KEYBDINPUT 
    {  
        public ushort wVk;  
        public ushort wScan;  
        public uint dwFlags;  
        public long time;  
        public uint dwExtraInfo; 
    }; 
    [StructLayout(LayoutKind.Explicit,Size=28)]  
    public struct INPUT 
    {  
        [FieldOffset(0)] 
        public uint type;
        #if x86 
    //32bit 
    [FieldOffset(4)] 
        #else
        //64bit 
        [FieldOffset(8)]
        #endif
        public KEYBDINPUT ki; 
    };

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

}

我在 XP 上使用 32/64 时遇到了这个问题，这是我想出的解决方案。我不是 pInvoke 专家，因此可能有更优雅的解决方案。

根本原因似乎是两种架构之间的字长不同。这会导致从外部调用中使用的数据结构中解析出一些复杂的数据。我必须为 64 位和 32 位声明两组独立的结构和外部调用。

internal static class SendInputExternalCalls
{
    // This SendInput call uses the 32bit input structure.
    [DllImport("user32.dll", SetLastError = true, EntryPoint = "SendInput")]
    public static extern UInt32 SendInput(
        UInt32 numInputs,
        [MarshalAs(UnmanagedType.LPArray, SizeConst = 1)]
        SEND_INPUT_FOR_32_BIT[] sendInputsFor,
        Int32 cbSize);

    // This SendInput call uses the 64bit input structure.
    [DllImport("user32.dll", SetLastError = true, EntryPoint = "SendInput")]
    public static extern UInt32 SendInput(
        UInt32 numInputs,
        [MarshalAs(UnmanagedType.LPArray, SizeConst = 1)] 
        SEND_INPUT_FOR_64_BIT[] sendInputsFor,
        Int32 cbSize);
}

// This is the basic structure for 32 bit input.  SendInput allows for other input   
// types, but I was only concerned with keyboard input, so I harcoded my strucs that way.
[StructLayout(LayoutKind.Explicit, Pack = 1)]
internal struct SEND_INPUT_FOR_32_BIT
{
    [FieldOffset(0)]
    public uint InputType;  
    [FieldOffset(4)]
    public KEYBOARD_INPUT_FOR_32_BIT KeyboardInputStruct; 
}

// Here is the structure for keyboard input.  The key code, scan code, and flags
// are what's important.  The other variables are place holders so that the structure
// maintains the correct size when compared to the other possible input structure types.  
[StructLayout(LayoutKind.Sequential, Pack = 1)]
internal struct KEYBOARD_INPUT_FOR_32_BIT
{
    public ushort VirtualKeyCode;
    public ushort ScanCode;
    public uint Flags;
    public uint Time;
    public uint ExtraInfo;
    public uint Padding1;
    public uint Padding2;
}

// Here's the corresponding 64 bit structure.  Notice that the field offset are larger. 
[StructLayout(LayoutKind.Explicit, Pack = 1)]
internal struct SEND_INPUT_FOR_64_BIT
{
    [FieldOffset(0)]
    public uint InputType;
    [FieldOffset(8)]
    public KEYBOARD_INPUT_FOR_64_BIT KeyboardInputStruct;
}

// Here's the keyboard 64 bit structure.  Notice that the field offset are again larger.
[StructLayout(LayoutKind.Explicit, Pack = 1)]
internal struct KEYBOARD_INPUT_FOR_64_BIT
{
    [FieldOffset(0)]
    public ushort VirtualKeyCode;
    [FieldOffset(2)]
    public ushort ScanCode;
    [FieldOffset(4)]
    public uint Flags;
    [FieldOffset(12)]
    public uint Time;
    [FieldOffset(20)]
    public uint Padding1;
    [FieldOffset(28)]
    public uint Padding2;
} 

这是稍微有点笨拙的部分。使用哪种结构取决于应用程序运行的架构。您可以针对 32 位或 64 位目标进行编译，但仍然可以在 64 位 Windows 上运行 32 位编译的应用程序。如果您希望 32 位编译的应用程序在 64 位计算机上使用 SendInput，则必须弄清楚在运行时要使用哪个结构。我通过在调用发送输入的公共方法时检查字长来做到这一点。

    public static void SendInput( ushort charUnicode )
    {
        // In 32 bit the IntPtr should be 4; it's 8 in 64 bit.
        if (Marshal.SizeOf(new IntPtr()) == 8)
        {
            SendInput64(charUnicode);
        }
        else
        {
            SendInput32(charUnicode);
        }
    }

我没有在 Vista 中尝试过此操作，但它可以在 32/64 位 Windows XP 和 32/64 位 Windows 7 中运行。