如何将 cdecl 回调与 pinvoke 一起使用

发布于 2024-10-16 06:07:31 字数 284 浏览 6 评论 0原文

我有一个带有 cdecl 回调的 ac 库。我如何在 c# 中使用这些。

一切似乎都在说它们必须是 stdcall 回调

才能清楚：

delegate int del();
[dllimport("mylib.dll",CallingConvention=CallingConvention.Cdecl)]
public static extern int funcwithcallback(del foo);

其中 del 必须以 cdecl 方式调用

原文

I have a c library that has cdecl callbacks. How can I use these from c#.

Everything seems to say that they must be stdcall callbacks

to be clear:

delegate int del();
[dllimport("mylib.dll",CallingConvention=CallingConvention.Cdecl)]
public static extern int funcwithcallback(del foo);

where del must be called cdecl-wise

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瀟灑尐姊 2024-10-23 06:07:31

看看这个。该功能自 1.1 起就已存在，因此它应该涵盖您正在使用的任何 .NET 版本。您只需指定 CallingConvention。

MSDN 上的 CallingConvention 文档

您还可以查看代码项目上的这篇文章：

在 C# 中使用 _CDECL 调用约定

编辑：此外，这是来自 FreeImage.NET 的示例。

static FreeImage_OutputMessageFunction freeimage_outputmessage_proc = NULL;
DLL_API void DLL_CALLCONV
FreeImage_SetOutputMessage(FreeImage_OutputMessageFunction omf);

然后在 C# 方面，只需：

[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
public delegate void FreeImage_OutputMessageFunction(FREE_IMAGE_FORMAT
format, string msg);

[DllImport(dllName, EntryPoint="FreeImage_SetOutputMessage")]
public static extern void SetOutputMessage(FreeImage_OutputMessageFunction
omf);

Take a look at this. The functionality has been around since 1.1 so it should cover whatever .NET version you are using. You just have to specify the CallingConvention.

CallingConvention Documenation at MSDN

You can also look at this article on Code Project:

Using the _CDECL calling convention in C#

EDIT: Also, Here is a example from FreeImage.NET.

static FreeImage_OutputMessageFunction freeimage_outputmessage_proc = NULL;
DLL_API void DLL_CALLCONV
FreeImage_SetOutputMessage(FreeImage_OutputMessageFunction omf);

Then on the C# side, simply:

[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
public delegate void FreeImage_OutputMessageFunction(FREE_IMAGE_FORMAT
format, string msg);

[DllImport(dllName, EntryPoint="FreeImage_SetOutputMessage")]
public static extern void SetOutputMessage(FreeImage_OutputMessageFunction
omf);

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