DllImport 堆栈溢出异常
我正在尝试使用 C# 中的 C++ DLL(borland c builder)。函数 writeParameter 工作正常，它将正确的数据写入文件，但随后出现异常“PresentationFramework.dll 中发生了类型为‘System.StackOverflowException’的未处理异常”
C++ 代码：
#include <vcl.h>
#include <windows.h>
#include <fstream.h>
#pragma hdrstop
#pragma argsused
BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fwdreason, LPVOID lpvReserved)
{
return 1;
}
//---------------------------------------------------------------------------
#pragma pack (push,1)
typedef struct
{
int a;
}ABC;
#pragma pack (pop)
//---------------------------------------------------------------------------
extern "C" void __declspec(dllexport) __cdecl writeParameter(ABC *abc)
{
ofstream outfile("result.txt");
outfile<< "A=" <<endl;
outfile << abc->a <<endl;
outfile.close();
}
c#:
[StructLayoutAttribute(LayoutKind.Sequential)]
public class ABC
{
public int a;
}
[DllImport("D:\\monitorVC.dll", EntryPoint = "_writeParameter", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
public static extern void WriteParameter(
[In,MarshalAs(UnmanagedType.LPStruct)]
ABC abc
);
private void Grid_Loaded(object sender, RoutedEventArgs e)
{
var abc = new ABC() {a = 123};
WriteParameter(abc);
}
I'm trying to use C++ DLL(borland c builder) from c#. Function writeParameter works fine, it writes correct data to a file, but then i have an exception "An unhandled exception of type 'System.StackOverflowException' occurred in PresentationFramework.dll"
C++ code:
#include <vcl.h>
#include <windows.h>
#include <fstream.h>
#pragma hdrstop
#pragma argsused
BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fwdreason, LPVOID lpvReserved)
{
return 1;
}
//---------------------------------------------------------------------------
#pragma pack (push,1)
typedef struct
{
int a;
}ABC;
#pragma pack (pop)
//---------------------------------------------------------------------------
extern "C" void __declspec(dllexport) __cdecl writeParameter(ABC *abc)
{
ofstream outfile("result.txt");
outfile<< "A=" <<endl;
outfile << abc->a <<endl;
outfile.close();
}
c#:
[StructLayoutAttribute(LayoutKind.Sequential)]
public class ABC
{
public int a;
}
[DllImport("D:\\monitorVC.dll", EntryPoint = "_writeParameter", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
public static extern void WriteParameter(
[In,MarshalAs(UnmanagedType.LPStruct)]
ABC abc
);
private void Grid_Loaded(object sender, RoutedEventArgs e)
{
var abc = new ABC() {a = 123};
WriteParameter(abc);
}
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评论（3）
阅读这篇关于选择不当的博客文章 UnmanagedType.LPStruct 的名称以及它如何不做每个人认为它做的事情。像这样修正你的声明：
Read this blog post about the very poorly chosen name for UnmanagedType.LPStruct and how it does not do what everybody thinks it does. Fix your declaration like this:
C# 中的类 != 结构体。
此外，C# 版本和 C++ 版本之间的结构打包也不同。
class != struct in C#.
Also, the packing of your structure is not the same between the C# version and the C++ version.
我知道这个问题发布已经有一段时间了，但我在尝试加载到 VS2010 C# 项目（一个使用 CodeGear C++ Builder 2007 构建的 .dll）时也有同样的经历。
解决方法是从我的 .dll 中删除所有 TForms 。在我看来，从这些表单导出的符号（顺便说一下，我无法删除）“导致”加载器堆栈溢出。
问候。
I know that it's been a while since this question was posted but I had the same experience trying to load to a VS2010 C# project, a .dll built with CodeGear C++ Builder 2007.
The work-around was to remove all TForms from my .dll. It seemed to me that the exported symbols from these forms (which by the way I could not remove) where "leading" the loader to a stack overflow.
Regards.