无法获取要在.net中运行的MFC dll函数
本文关键字:运行 MFC dll 函数 net 获取 | 更新日期: 2023-09-27 18:19:51
我正在尝试创建一个简单的MFC DLL,导出它的函数并在C#.net项目中使用在下面的代码中,我在DLL中有两个方法,我已经采取了海报对原始问题的建议。我正在转发当前代码,我得到错误
{"找不到名为"的入口点_Worker_Create@0'in DLL'C:''Users''mspath''Documents''MDS_SIMCA''DevSIMCA_DLL''TestDLL''Debug''MFClib.DLL'。":"}
我使用了dumpbin.exe来获得正确的损坏名称。
MFC DLL.cpp
#include "stdafx.h"
#include "Worker.h"
Worker::Worker(void)
{
}
Worker::~Worker(void)
{
}
int Worker::GetInteger()
{
return 44;
}
int Worker::DoMath(int iOne, int iTwo)
{
return iOne * iTwo;
}
MFC DLL.h
阶级工人{公共:工人(无效);~工人(无效);
static int GetInteger ();
static int DoMath (int iOne, int iTwo);
};
MFCLib.cpp
extern "C"
{
__declspec(dllexport) void * __stdcall Worker_Create()
{
return new Worker();
}
__declspec(dllexport) void * __stdcall Worker_Destroy(Worker * instance)
{
delete instance;
instance = 0;
return instance;
}
__declspec(dllexport) int __stdcall Worker_DoMath(Worker * instance, int i, int j)
{
return instance->DoMath(i, j);
}
}
C#.net
public partial class MainWindow : Window
{
/*
* from dumbin.exe /exports:
*
1 0 00011519 _Worker_Create@0 = @ILT+1300(_Worker_Create@0)
2 1 00011230 _Worker_Destroy@4 = @ILT+555(_Worker_Destroy@4)
3 2 000110D2 _Worker_DoMath@12 = @ILT+205(_Worker_DoMath@12)
*/
[DllImport("C:''Users''mspath''Documents''MDS_SIMCA''DevSIMCA_Dll''TestDLL''Debug''MFClib.dll",
EntryPoint = "_Worker_Create@0",
ExactSpelling = false,
CallingConvention = CallingConvention.StdCall)]
public extern static IntPtr Worker_Create();
[DllImport("C:''Users''mspath''Documents''MDS_SIMCA''DevSIMCA_Dll''TestDLL''Debug''MFClib.dll",
EntryPoint = "_Worker_Destroy@4",
CallingConvention = CallingConvention.StdCall)]
public extern static IntPtr Worker_Destroy(IntPtr iptr);
[DllImport("C:''Users''mspath''Documents''MDS_SIMCA''DevSIMCA_Dll''TestDLL''Debug''MFClib.dll",
EntryPoint = "_Worker_DoMath@12",
CallingConvention = CallingConvention.StdCall)]
public extern static int Worker_DoMath(IntPtr instance, int i, int j);
public MainWindow()
{
InitializeComponent();
}
private void Button_Click(object sender, RoutedEventArgs e)
{
IntPtr instance = Worker_Create();
int i = Worker_DoMath(instance, 4, 2);
Worker_Destroy(instance);
}
}
您必须在C++类的外部声明外部"C样式"函数。一种方法是通过管道将调用发送到类:
__declspec(dllexport) int DoMath (int iOne, int iTwo)
{
Worker* worker = new Worker();
int i = worker-> DoMath(iOne, iTwo);
delete worker;
return i;
}
或者将C++类转换为C++/CLI类,并将库导入为托管库,而不是非托管 免责声明:我的C++太生疏了,所以我可能对语法和/或正确的内存管理有点偏离。
您的调用约定是错误的__declspec(dllexport)只导出函数,并没有使其具有标准的调用约定。我会将__stdcall或WINAPI添加到您的函数签名中,以便它们使用标准调用。您的一个函数之所以有效,是因为它没有要传递或从堆栈中弹出的参数。