无法调用MCR的InitializeApplication

Question

我正在通过Matlab拨打MCR来调用P/Invoke功能。 它抛出一个异常，但我无法解决它，我搜索了很多，但找不到解决方案。

这是错误

[DllImport(@"C:\Program Files\MATLAB\MATLAB Compiler Runtime\v80\runtime\win64\mclmcrrt8_0.dll", EntryPoint = "mclInitializeApplication_proxy", CallingConvention = CallingConvention.Cdecl)]
    private static extern bool mclInitializeApplication(string options, Int32 count);


    private static void Main(string[] args)
    {
        var option = "-nojvm";

        var result = mclInitializeApplication(option, 1);

        Console.WriteLine(result);
        Console.ReadLine();
    }

Answer 1

“mclIntializeApplication”的正确编组是：

[DllImport((@"C:\Program Files\MATLAB\MATLAB Compiler Runtime\v80\runtime\win64\mclmcrrt8_0.dll, EntryPoint = "mclInitializeApplication_proxy", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi, ExactSpelling = true)]
public static extern bool mclInitializeApplication([MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.LPStr)] string[] options, int count);

这是第一个参数是字符串数组（char **）。然后你应该这样称呼它：

var options = new [] { "-nojvm" };
var result = mclInitializeApplication(options, options.Length);

为了避免传递长度并控制布尔结果，您还可以将上面的函数包装到更友好的C＃中：

public static void mclInitializeApplication(params string[] options)
{
    var count = 0;
    if (options != null) { count = options.Length; }
    if (!_mclInitializeApplication(options, count))
    {
        var reason = mclGetLastErrorMessage();
        throw new Exception(String.Format("Call to '{0}' failed: {1}", "mclInitializeApplication", reason));               
    }
}

使用：

[DllImport(@"C:\Program Files\MATLAB\MATLAB Compiler Runtime\v80\runtime\win64\mclmcrrt8_0.dll", EntryPoint = "mclGetLastErrorMessage_proxy", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi, ExactSpelling = true)]
private static extern IntPtr _mclGetLastErrorMessage();
public static String mclGetLastErrorMessage()
{
    var ptr = _mclGetLastErrorMessage(); 
    return Marshal.PtrToStringAnsi(ptr);
}

但是，在我看来，如果你想要以.NET为目标，最好的解决方案是让Matlab直接使用Mathworks提供的SDK在.NET中编译。