c# - 将托管字符串 [] 编码为非托管字符**

Question

这是我的 C++ 结构(使用多字节字符集)

typedef struct hookCONFIG {
    int threadId;
    HWND destination;

    const char** gameApps;
    const char** profilePaths;
} HOOKCONFIG;

和 .Net 结构

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct HOOKCONFIG {
    public int threadId;
    public IntPtr destination;

    // MarshalAs?
    public string[] gameApps;

    // MarshalAs?
    public string[] profilePaths;
}

我遇到了一些问题，如何编码字符串数组？当我在 C++ 中访问结构变量“profilePaths”时，出现如下错误:

An unhandled exception of type 'System.AccessViolationException' occurred in App.exe

Additional information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

MessageBox(0, cfg.profilePaths[0], "Title", MB_OK); // error ... Orz

Answer 1

简单方法:将原型(prototype)更改为 IntPtr[]:

public IntPtr[] gameApps;
public IntPtr[] profilePaths;

现在，当您调用时，您需要大致执行以下伪代码:

GCHandle handle = GCHandle.Alloc(string);
gameApps = new IntPtr[] { GCHandle.ToIntPtr(handle) };

// Unmanaged call

handle.Free();