Member Avatar for bejfake

Hi,

I have such simple structure in unmanaged C++:

    struct Cam
    {
        char ip[16];
        char login[16];
        char pass[16];
        char name[16];
    };

and C# marshalled structure:

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
    public struct Cam
    {
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 16)]
        public string ip;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 16)]
        public string login;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 16)]
        public string pass;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 16)]
        public string name;
    }

When I pass C# struct to C++ lib by function

[DllImport("NVRLib.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern void AddCameraStruct(Cam cam);
...
Cam cam = new Cam();
cam.ip = "192.168.0.232";
cam.login = "admin";
cam.pass = "admin";
cam.name = "kekekeke";
AddCameraStruct(cam);

and print passed values in C++:

__declspec(dllexport) void AddCameraStruct(Camera cam)
    {
        printf(cam.ip);
        printf("\n");
        printf(cam.login);
        printf("\n");
        printf(cam.name);
        printf("\n");
        printf(cam.pass);
        strcpy(camera[CAM_NUM].ip, cam.ip);
        strcpy(camera[CAM_NUM].login, cam.login);
        strcpy(camera[CAM_NUM].pass, cam.pass);
        strcpy(camera[CAM_NUM].name, cam.name);
        CAM_NUM++;
    }

it prints:

232
<EMPTY LINE>
192.168.0.232
n

What am I doing wrong?

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Member Avatar for bejfake

Problem solved. Actually there wasn't problem - there was my mistake.

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