巧用Marshal.GetDelegateForFunctionPointer--C#如何调用按键精灵插件dll
Posted on 2008-02-10 15:20 绿叶 阅读(9988) 评论(12) 编辑 收藏 举报原来是为了在游戏外挂中发送键盘鼠标消息,自己写个sendmessage或者是postmessage又比较麻烦。于是google了一下,发现现在很多脚本工具都有这个功能,其中按键精灵的一个叫361度的插件已经有这个的实现,还验证过了。为什么不拿来己用呢?
首先分析一下按键精灵插件的接口,发现:
插件的功能函数没有直接暴露出来,而是通过一个GetCommand的函数返回一个函数描述结构。
接下来看看这个结构:
上面这个结构我已经是转换成C#的对应结构了,原结构可以查看按键精灵提供的插件C++接口源代码。
这个结构里面的 handlerFunction 实际上是指向函数的入口点,也就是一个函数指针,每个函数都一样是2个参数:
typedef int (*QMPLUGIN_HANDLER)(char *lpszParamList, char *lpszRetVal);
转换为C#中相应的委托为:
delegate void Invoker(string parameters, StringBuilder returnValue);
大家注意到,有两个参数,c++原型中都是char*类型,转换为C#的delegate后第一个为string,第二个为StringBuilder。这是因为parameters是in的,dll中不会对这个参数做修改,而returnValue是out的,dll返回时候要把返回值写入这个StringBuilder的缓冲区。
原本的想法是用C++写一个桥来调用dll,不过在.net 2.0 中,框架直接提供了 Marshal.GetDelegateForFunctionPointer 来转换一个函数指针为一个委托,这就方便多拉。请看下面代码,注意看 BGKM_ExecuteCommand 这个函数里面的东西。
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
namespace WJsHome.Game.Utility
{
public class QMacro
{
[DllImport("BGKM5.dll", EntryPoint = "GetCommand")]
static extern IntPtr BGKM_GetCommand(int commandNum);
[StructLayout(LayoutKind.Sequential)]
class QMPLUGIN_CMD_INFO
{
public string commandName;
public string commandDescription;
public IntPtr handlerFunction;
public uint paramNumber;
}
delegate void Invoker(string parameters, StringBuilder returnValue);
static string BuildParameters(params object[] parameters)
{
StringBuilder sb = new StringBuilder();
for (int i = 0; i < parameters.Length; i++)
{
sb.Append(parameters[i].ToString());
if (i != parameters.Length - 1)
{
sb.Append(',');
}
}
return sb.ToString();
}
static void BGKM_ExecuteCommand(int cmdNum, string parameters, StringBuilder retVal)
{
IntPtr pCmdInfo = BGKM_GetCommand(cmdNum);
QMPLUGIN_CMD_INFO cmdInfo = new QMPLUGIN_CMD_INFO();
Marshal.PtrToStructure(pCmdInfo, cmdInfo);
Invoker invoker = Marshal.GetDelegateForFunctionPointer(cmdInfo.handlerFunction, typeof(Invoker)) as Invoker;
invoker(parameters, retVal);
}
public static void BGKM_KeyClick(IntPtr hWnd, int key)
{
BGKM_ExecuteCommand(0, BuildParameters(hWnd, key), null);
}
public static void BGKM_KeyDown(IntPtr hWnd, int key)
{
BGKM_ExecuteCommand(1, BuildParameters(hWnd, key), null);
}
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public static void BGKM_Mouse(IntPtr hWnd, int code, int x, int y)
{
BGKM_ExecuteCommand(15, BuildParameters(hWnd, code, x, y), null);
}
public static WinApi.POINT BGKM_ScrToCli(IntPtr hWnd, int x, int y)
{
StringBuilder retVal = new StringBuilder();
BGKM_ExecuteCommand(16, BuildParameters(hWnd, x, y), retVal);
string[] tmp = retVal.ToString().Split('|');
return new WinApi.POINT(int.Parse(tmp[0]), int.Parse(tmp[1]));
}
}
}
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
namespace WJsHome.Game.Utility
{
public class QMacro
{
[DllImport("BGKM5.dll", EntryPoint = "GetCommand")]
static extern IntPtr BGKM_GetCommand(int commandNum);
[StructLayout(LayoutKind.Sequential)]
class QMPLUGIN_CMD_INFO
{
public string commandName;
public string commandDescription;
public IntPtr handlerFunction;
public uint paramNumber;
}
delegate void Invoker(string parameters, StringBuilder returnValue);
static string BuildParameters(params object[] parameters)
{
StringBuilder sb = new StringBuilder();
for (int i = 0; i < parameters.Length; i++)
{
sb.Append(parameters[i].ToString());
if (i != parameters.Length - 1)
{
sb.Append(',');
}
}
return sb.ToString();
}
static void BGKM_ExecuteCommand(int cmdNum, string parameters, StringBuilder retVal)
{
IntPtr pCmdInfo = BGKM_GetCommand(cmdNum);
QMPLUGIN_CMD_INFO cmdInfo = new QMPLUGIN_CMD_INFO();
Marshal.PtrToStructure(pCmdInfo, cmdInfo);
Invoker invoker = Marshal.GetDelegateForFunctionPointer(cmdInfo.handlerFunction, typeof(Invoker)) as Invoker;
invoker(parameters, retVal);
}
public static void BGKM_KeyClick(IntPtr hWnd, int key)
{
BGKM_ExecuteCommand(0, BuildParameters(hWnd, key), null);
}
public static void BGKM_KeyDown(IntPtr hWnd, int key)
{
BGKM_ExecuteCommand(1, BuildParameters(hWnd, key), null);
}
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public static void BGKM_Mouse(IntPtr hWnd, int code, int x, int y)
{
BGKM_ExecuteCommand(15, BuildParameters(hWnd, code, x, y), null);
}
public static WinApi.POINT BGKM_ScrToCli(IntPtr hWnd, int x, int y)
{
StringBuilder retVal = new StringBuilder();
BGKM_ExecuteCommand(16, BuildParameters(hWnd, x, y), retVal);
string[] tmp = retVal.ToString().Split('|');
return new WinApi.POINT(int.Parse(tmp[0]), int.Parse(tmp[1]));
}
}
}
好了,方便哇?这样一来,我们可以在.net上面实现动态加载和卸载Win32 dll. 具体思路就是:(还是代码来得方便)
public delegate int MsgBox(int hwnd,string msg,string cpp,int ok);
[DllImport("Kernel32")]
public static extern int GetProcAddress(int handle, String funcname);
[DllImport("Kernel32")]
public static extern int LoadLibrary(String funcname);
[DllImport("Kernel32")]
public static extern int FreeLibrary(int handle);
private static Delegate GetAddress(int dllModule, string functionname, Type t)
{
int addr = GetProcAddress(dllModule, functionname);
if (addr == 0)
return null;
else
return Marshal.GetDelegateForFunctionPointer(new IntPtr(addr), t);
}
private void button1_Click(object sender, EventArgs e)
{
int huser32 = 0;
huser32 = LoadLibrary("user32.dll");
MsgBox mymsg = (MsgBox)GetAddress(huser32, "MessageBoxA", typeof(MsgBox));
mymsg(this.Handle.ToInt32(), txtmsg.Text, txttitle.Text , 64);
FreeLibrary(huser32);
}
上面代码是从internet上copy下来的,anyway, enjoy[DllImport("Kernel32")]
public static extern int GetProcAddress(int handle, String funcname);
[DllImport("Kernel32")]
public static extern int LoadLibrary(String funcname);
[DllImport("Kernel32")]
public static extern int FreeLibrary(int handle);
private static Delegate GetAddress(int dllModule, string functionname, Type t)
{
int addr = GetProcAddress(dllModule, functionname);
if (addr == 0)
return null;
else
return Marshal.GetDelegateForFunctionPointer(new IntPtr(addr), t);
}
private void button1_Click(object sender, EventArgs e)
{
int huser32 = 0;
huser32 = LoadLibrary("user32.dll");
MsgBox mymsg = (MsgBox)GetAddress(huser32, "MessageBoxA", typeof(MsgBox));
mymsg(this.Handle.ToInt32(), txtmsg.Text, txttitle.Text , 64);
FreeLibrary(huser32);
}
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