准备:
首先打开vc++ 6.0新建工程,选择Win32 Dynamic Link-Library,命名为stdLibrary
新建library.cpp文件，内容如下
#include <stdio.h>
#include <windows.h> BOOL APIENTRY DllMain( HMODULE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved)
{
return TRUE;
} HRESULT __stdcall TestAdd(int i, int j)
{
return i + j;
}
接着新建Text File命名为export.def,内容如下
LIBRARY "stdLibrary"
EXPORTS
TestAdd @1
编译项目得到stdLibrary.dll
1 vb调用stdLibrary.dll
新建标准EXE工程，拖拽界面，如图
右键查看代码，编写如下代码
Private Declare Function TestAdd Lib "stdLibrary.dll" (ByVal InX As Long, ByVal InY As Long) As Long Private Sub cmdCaclute_Click()
Dim x As Long
Dim y As Long
Dim result As Long x = txtX.Text y = txtY.Text result = TestAdd(x, y) txtResult.Text = result End Sub
然后使用vb生成exe,把stdLibrary.dll拖拽到项目所在编译目录,运行即可，调用成功。
注意：vb调用第三方dll，调试过程 Lib “stdLibrary.dll”如果不是绝对路径会报错，不懂是不是vb的bug，只要生成exe后运行就不报错了
2 c#调用stdLibrary.dll
编写如下代码,并且把stdLibrary.dll拖拽到Debug/Release目录
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices; namespace csharpcallcLibrary
{
class Program
{
[DllImport("stdLibrary.dll", CallingConvention = CallingConvention.StdCall)]
public static extern int TestAdd(int x, int y); static void Main(string[] args)
{
int x = , y = ,result=;
result=TestAdd(x, y);
Console.WriteLine("{0} + {1} = {2}",x,y,result);
Console.Read();
}
}
}
运行编译生成的exe，至此调用成功