如何导入带有某些本机类型参数的函数? [英] How to import a function which takes some parameters of native types?

问题描述

我有一个用C编写的本机DLL，其中包含以下功能:

I have a native DLL written in C, which contains this function:

SomeFunction(int cmd, int param, unsigned char* data);

在VS2005上的C#代码中，如何通过DllImport属性导入此函数?请注意，此函数需要一些本机类型的参数.

我应该以这种方式导入:

In my C# code on VS2005, how do I import this function via DllImport attribute? Note this function takes some parameters of native types.

Should I import this way:

[DllImport("SomeNativeDll")]
public static extern int SomeFunction(int cmd, int param, ref byte data);

推荐答案

它实际上取决于参数的用途.在我看来，data 是byte 缓冲区，因此您的P/Invoke签名应为:

It really depends on what the parameter is used for. It seems to me that data is a byte buffer, so your P/Invoke signature should be:

public static extern int SomeFunction(int cmd, int param, out byte[] data);

如果该方法希望您传递已初始化的数组，则可以使用ref 而不是out.

You may use ref instead of out, if the method expects you to pass an initialized array.

这篇关于如何导入带有某些本机类型参数的函数?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！