Dll使用数组将C ++导入C＃

I've been given the assignment to port some library routines to C# so our other application developers can access it, but I don't know how to declare the variables so they come into the routine correctly.

我已经获得了将一些库例程移植到C#的任务,因此我们的其他应用程序开发人员可以访问它,但我不知道如何声明变量以便它们正确地进入例程。

The problem is, when I step through reading the input in with the C++ code, I get all skewed values

问题是,当我逐步阅读C ++代码中的输入时,我得到了所有偏斜的值

Attempt to use:

尝试使用:

double[] Par = { 8, 16, 8, 0.61, 0.00635, ... }; // 29 variables
double[] Inlet = { 22.18, 43.31, 1.13, 2.81, 0.43 }; // 5 variables
double[] Outlet = { 0, 0, 0, 0, 0, 0 }; // placeholder for 6 variables
SteadyFor(ref Par, ref Inlet, ref Outlet, FileIn, FileOut);

The DLL Import

DLL导入

[DllImport(MODELAPP, EntryPoint = "SteadyFor", ExactSpelling = false)]
public static extern int SteadyFor(
  ref double[] par, ref double[] inlet, ref double[] outlet,
  [MarshalAs(UnmanagedType.LPStr)] string input,
  [MarshalAs(UnmanagedType.LPStr)] string output);

The C++ file:

C ++文件:

extern "C" int SteadyFor(double Par[], double Inlet[], double Outlet[], char* FileIn, char* FileOut)
{
  int n = (int)Par[0]; // Actual Reading: [0]
  int nt = (int)Par[1]; // Actual Reading: [0]
  int pass = (int)Par[2]; // Actual Reading: [0]
  double l = Par[3]; // Actual Reading: [2.9581223236733198e+174]
  double rTube = Par[4]; // Actual Reading: [2.121995790965e-314#DEN]
  double tTube = Par[5]; // Actual Reading: [5.432309224896e-312#DEN]
  double pl = Par[6]; // Actual Reading: [1.0253217546256438e-267]
  double pt = Par[7]; // Actual Reading: [4.60629e-308]
  // ...
}

Obviously, the values I am getting are all wrong - almost like non-initialized memory.

显然,我得到的值都是错误的 - 几乎就像非初始化的内存。

Could someone tell me what I'm doing wrong and how to fix it?

有人能告诉我我做错了什么以及如何解决它?

Regards,

~Joe

2 个解决方案

#1

Drop the "ref" keywords in the declaration, they are not correct. That the C++ code doesn't crash with an AV is a bit mysterious.

删除声明中的“ref”关键字,它们不正确。 C ++代码没有与AV崩溃有点神秘。

The [MarshalAs] attribute on the strings is unnecessary.

字符串上的[MarshalAs]属性是不必要的。

#2

Basically you need to declare a marshalling attribute. In your case, it would be a MarshalAs(UnmanagedType.LPArray) attribute.

基本上你需要声明一个编组属性。在您的情况下,它将是MarshalAs(UnmanagedType.LPArray)属性。

Look here:
http://msdn.microsoft.com/en-us/library/z6cfh6e6%28VS.80%29.aspx#cpcondefaultmarshalingforarraysanchor3

看这里:http://msdn.microsoft.com/en-us/library/z6cfh6e6%28VS.80%29.aspx#cpcondefaultmarshalingforarraysanchor3

#1