如何将 unicode 字符串从 c# 传输到 c/c++ dll

Question

我从 C# 调用了一个 C/C++ DLL 函数，当函数有 wchar_t* parameter.
时出现问题我把参数从wchar_t*改成了char*，然后就ok了
为什么？如何让它与 wchar_t* 一起工作？

这是我的代码：

C#

[DllImport("kernel32")]
private static extern IntPtr LoadLibraryEx(string fileName, IntPtr hFile, uint loadFlag);

[DllImport("kernel32.dll")]
public static extern IntPtr GetProcAddress(IntPtr lib, string funcName);

[DllImport("kernel32.dll")]
public static extern bool FreeLibrary(IntPtr lib);

delegate void DllTestFunc(string str, byte[] data, int length);

static void Main(string[] args)
{   
    var dllInstance = LoadLibraryEx(@"D:\Development\NativeDll\x64\Debug\NativeDll.dll", IntPtr.Zero, 0x0008);
    var ptr = GetProcAddress(dllInstance, "DllTestFunc");
    var func = Marshal.GetDelegateForFunctionPointer<DllTestFunc>(ptr);
    var inputStr = @"E:\test.dat";
    var data = new byte[100];
    data[0] = 0x55;
    func(inputStr, data, 2020);
    FreeLibrary(dllInstance);
}

C/C++代码：

void __stdcall DllTestFunc(wchar_t* str1, unsigned char* data, const int length)

{

    cout << str1 << endl;

    cout << int(data[0]) << endl;

    cout << length << endl;**strong text**

}

因为我需要使用wchar_t*，如何解决？

Answer 1

您可能需要告诉编组器如何传输委托的 str 参数：

delegate void DllTestFunc([MarshalAs(UnmanagedType.LPWStr)] string str, byte[] data, int length);

如何将 unicode 字符串从 c# 传输到 c/c++ dll

How to transfer unicode string from c# to c/c++ dll

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