前段时间做了一个项目，其中要求调用一个VC6开发的Dll文件，而该文件有多个不同的版本，所以要支持动态调用，并支持卸载。
在收集了一些这方面的资料后，编写了下面的类，该类可以方便的调用各种类型的dll，而且简单实用。
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using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
namespace testdll
{
/// <summary>
///
/// </summary>
class InvokeDll
{
#region Win API
[DllImport("kernel32.dll")]
private extern static IntPtr LoadLibrary(string path);
[DllImport("kernel32.dll")]
private extern static IntPtr GetProcAddress(IntPtr lib, string funcName);
[DllImport("kernel32.dll")]
private extern static bool FreeLibrary(IntPtr lib);
#endregion
private IntPtr hLib;
public InvokeDll(String DLLPath)
{
hLib = LoadLibrary(DLLPath);
}
~InvokeDll()
{
FreeLibrary(hLib);
}
//将要执行的函数转换为委托
public Delegate Invoke (string APIName,Type t)
{
IntPtr api = GetProcAddress(hLib, APIName);
if (api == IntPtr.Zero)
return null;
else
return Marshal.GetDelegateForFunctionPointer(api, t);
}
}
}
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
namespace testdll
{
/// <summary>
///
/// </summary>
class InvokeDll
{
#region Win API
[DllImport("kernel32.dll")]
private extern static IntPtr LoadLibrary(string path);
[DllImport("kernel32.dll")]
private extern static IntPtr GetProcAddress(IntPtr lib, string funcName);
[DllImport("kernel32.dll")]
private extern static bool FreeLibrary(IntPtr lib);
#endregion
private IntPtr hLib;
public InvokeDll(String DLLPath)
{
hLib = LoadLibrary(DLLPath);
}
~InvokeDll()
{
FreeLibrary(hLib);
}
//将要执行的函数转换为委托
public Delegate Invoke (string APIName,Type t)
{
IntPtr api = GetProcAddress(hLib, APIName);
if (api == IntPtr.Zero)
return null;
else
return Marshal.GetDelegateForFunctionPointer(api, t);
}
}
}
使用时，先根据dll中的命令写出相关的代理
public delegate int MsgBox(int hwnd,string msg,string cpp,int ok);
public delegate int DeleteFile(string msg);
然后按下面的代码做就可以了。
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InvokeDll dll = new InvokeDll("user32.dll");
MsgBox mymsg = (MsgBox)dll.Invoke("MessageBoxA", typeof(MsgBox));
mymsg(this.Handle.ToInt32(), "txtmsg", "titleText", 64);
InvokeDll dll1 = new InvokeDll("kernel32.dll");
DeleteFile df= (DeleteFile)dll1.Invoke("DeleteFileA", typeof(DeleteFile));
df(deletedfilename);
本文转自94cool博客园博客，原文链接：http://www.cnblogs.com/94cool/archive/2009/08/31/1557050.html，如需转载请自行联系原作者
