将数据从托管对象封送到非托管内存块的问题，请各位高手赐教啊！

[zdy1986816]

用c#做的改建程序，下面是回调函数的代码片段，如果我想把q键改成z键，那么现在问题就来了：
因为KeyBoardHookProc() CallNextHookEx() 函数的 lParam参数都是指针类型，
我用KeyBoardHookStruct kbh = (KeyBoardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyBoardHookStruct))这句把非托管的内存的转换成了托管的结构，但是我想用这句Marshal.StructureToPtr(kbh, lParam, false)把值改变后的结构从托管对象转到非托管内存块，但是运行后没起作用。
请各位高手赐教，这里该怎么实现啊？

public static int KeyBoardHookProc(int nCode, int wParam, IntPtr lParam)
{
if (nCode >= 0)
{

KeyBoardHookStruct kbh = (KeyBoardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyBoardHookStruct));
if (kbh.vkCode == (int)Keys.Q)
{
//kbh.vkCode = (int)Keys.Z;
//Marshal.StructureToPtr(kbh, lParam, true);
//CallNextHookEx(hHook, nCode, wParam, lParam);
return 1;
}
}
return CallNextHookEx(hHook, nCode, wParam, lParam);

}

public class KeyBoardHookStruct
{
public int vkCode;
public int scanCode;
public int flags;
public int time;
public int dwExtraInfo;
}

[pcjbird]

什么叫没起作用，运行结果是什么，断点跟踪的结果呢？

[pcjbird]

貌似看不出什么不对的地方~~~~

[zdy1986816]

兄台，谢谢你的关注！
下面是全部的代码，你加个窗体，把 button1_Click ， button2_Click注册到按钮的事件中，帮我看一下吧。
问题的地方我用红色标明了。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Reflection;
using System.Diagnostics;
using System.IO;

namespace HookExample2
{
public partial class Form1 : Form
{
//委托
public delegate int HookProc(int nCode, int wParam, IntPtr lParam);
static int hHook = 0;
public const int WH_KEYBOARD_LL = 13;
//LowLevel键盘截获，如果是WH_KEYBOARD＝2，并不能对系统键盘截取，Acrobat Reader会在你截取之前获得键盘。
HookProc KeyBoardHookProcedure;
//键盘Hook结构函数
[StructLayout(LayoutKind.Sequential)]
public class KeyBoardHookStruct
{
public int vkCode;
public int scanCode;
public int flags;
public int time;
public int dwExtraInfo;
}
#region DllImport
//设置钩子
[DllImport("user32.dll")]
public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
//抽掉钩子
public static extern bool UnhookWindowsHookEx(int idHook);
[DllImport("user32.dll")]
//调用下一个钩子
public static extern int CallNextHookEx(int idHook, int nCode, int wParam, IntPtr lParam);

[DllImport("kernel32.dll")]
public static extern int GetCurrentThreadId();

[DllImport("kernel32.dll")]
public static extern IntPtr GetModuleHandle(string name);

#endregion
#region 自定义事件
public void Hook_Start()
{
// 安装键盘钩子
if (hHook == 0)
{
KeyBoardHookProcedure = new HookProc(KeyBoardHookProc);

//hHook = SetWindowsHookEx(2,
// KeyBoardHookProcedure,
// GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), GetCurrentThreadId());

hHook = SetWindowsHookEx(WH_KEYBOARD_LL,
KeyBoardHookProcedure,
GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), 0);

//如果设置钩子失败.
if (hHook == 0)
{
Hook_Clear();
//throw new Exception("设置Hook失败!");
}
}
}

//取消钩子事件
public void Hook_Clear()
{
bool retKeyboard = true;
if (hHook != 0)
{
retKeyboard = UnhookWindowsHookEx(hHook);
hHook = 0;
}
//如果去掉钩子失败.
if (!retKeyboard) throw new Exception("UnhookWindowsHookEx failed.");
}

//这里可以添加自己想要的信息处理
public static int KeyBoardHookProc(int nCode, int wParam, IntPtr lParam)
{
if (nCode >= 0)
{

KeyBoardHookStruct kbh = (KeyBoardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyBoardHookStruct));
if (kbh.vkCode == (int)Keys.Q)
{
kbh.vkCode = (int)Keys.Z;
Marshal.StructureToPtr(kbh, lParam, true);
return CallNextHookEx(hHook, nCode, wParam, lParam);
//return 1;
}
} return CallNextHookEx(hHook, nCode, wParam, lParam);

}
#endregion

public Form1()
{

InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
Hook_Start();
}

private void button2_Click(object sender, EventArgs e)
{
Hook_Clear();
}

}
}

[zdy1986816]

兄台，谢谢你的关注！
下面是全部的代码，你加个窗体，把 button1_Click ， button2_Click注册到按钮的事件中，帮我看一下吧。
问题的地方我用红色标明了。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Reflection;
using System.Diagnostics;
using System.IO;

namespace HookExample2
{
public partial class Form1 : Form
{
//委托
public delegate int HookProc(int nCode, int wParam, IntPtr lParam);
static int hHook = 0;
public const int WH_KEYBOARD_LL = 13;
//LowLevel键盘截获，如果是WH_KEYBOARD＝2，并不能对系统键盘截取，Acrobat Reader会在你截取之前获得键盘。
HookProc KeyBoardHookProcedure;
//键盘Hook结构函数
[StructLayout(LayoutKind.Sequential)]
public class KeyBoardHookStruct
{
public int vkCode;
public int scanCode;
public int flags;
public int time;
public int dwExtraInfo;
}
#region DllImport
//设置钩子
[DllImport("user32.dll")]
public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
//抽掉钩子
public static extern bool UnhookWindowsHookEx(int idHook);
[DllImport("user32.dll")]
//调用下一个钩子
public static extern int CallNextHookEx(int idHook, int nCode, int wParam, IntPtr lParam);

[DllImport("kernel32.dll")]
public static extern int GetCurrentThreadId();

[DllImport("kernel32.dll")]
public static extern IntPtr GetModuleHandle(string name);

#endregion
#region 自定义事件
public void Hook_Start()
{
// 安装键盘钩子
if (hHook == 0)
{
KeyBoardHookProcedure = new HookProc(KeyBoardHookProc);

//hHook = SetWindowsHookEx(2,
// KeyBoardHookProcedure,
// GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), GetCurrentThreadId());

hHook = SetWindowsHookEx(WH_KEYBOARD_LL,
KeyBoardHookProcedure,
GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), 0);

//如果设置钩子失败.
if (hHook == 0)
{
Hook_Clear();
//throw new Exception("设置Hook失败!");
}
}
}

//取消钩子事件
public void Hook_Clear()
{
bool retKeyboard = true;
if (hHook != 0)
{
retKeyboard = UnhookWindowsHookEx(hHook);
hHook = 0;
}
//如果去掉钩子失败.
if (!retKeyboard) throw new Exception("UnhookWindowsHookEx failed.");
}

//这里可以添加自己想要的信息处理
public static int KeyBoardHookProc(int nCode, int wParam, IntPtr lParam)
{
if (nCode >= 0)
{

KeyBoardHookStruct kbh = (KeyBoardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyBoardHookStruct));
if (kbh.vkCode == (int)Keys.Q)
{
kbh.vkCode = (int)Keys.Z;
Marshal.StructureToPtr(kbh, lParam, true);
return CallNextHookEx(hHook, nCode, wParam, lParam);
//return 1;
}
} return CallNextHookEx(hHook, nCode, wParam, lParam); }
#endregion

public Form1()
{

InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
Hook_Start();
}

private void button2_Click(object sender, EventArgs e)
{
Hook_Clear();
}

}
}

[zdy1986816]

已经解决了，不麻烦大家了

[龙宜坡]

OK

[pandyer]

怎么解决的呀?我跟你碰到一样的问题 希望 楼主解答下