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SendInput keys on Win32 and Win64 machines

I used sendInput () under xp 32bits, using webservices to press F5 of the current focused windows. Now under Vista win64 I can not get this result. Some articles point to uint problems using 4 bits or 8 bits, but this does not fix the problem under Vista with differential compilation and FieldOffset (4) or (8). Others talk about the lack of interaction between the Vista screen and the window using this SendInput () method. Can someone point out a decision to press F5 in win32 and win64. Thank.

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);

}

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2 answers

32/64 XP, , . pInvoke, .

, -, , . , , . 64- 32-.

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 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 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 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;
}

. . 32 64- , 32- 64- Windows. , 32- SendInput 64- , , . , , .

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

Vista, 32/64 Windows XP 32/64 Windows 7.

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