unsigned char型**相当于C＃和必须写在文件中的返回值 [英] unsigned char ** equivalent in c# and have to write the return value in a file

问题描述

我要调用一个Win32 DLL函数

  INT FUNC1（INT ARG1，unsigned char型** ARG2，为int * ARG3 ）; 
  

和我需要裹在C＃作为

 公开的extern INT fuc1（INT ARG1，出的IntPtr ARG2，出的IntPtr ARG3）; 
  

和我把它叫做从C＃应用程序

  INT ARG1; 
 IntPtr的ARG2 = IntPtr.Zero; 
 IntPtr的参数3 = IntPtr.Zero; 
 func1的（ARG1，ARG2出来，出来ARG3）; 
  

在C＃包装声明，以及呼吁在C＃中的测试程序正确的功能？
现在我需要的ARG2存储在一个文本文件中。如何做到这一点。

这是汉斯得到答案，我用

写在文件

  System.IO.StreamWriter（@ Application.StartupPath +\\Filename.txt）; 
 file.WriteLine（ARG2）; 
 file.Close（）; 
  

解决方案

我有一个免费的在DLL函数清除内存

然后，你必须在做这项工作的一个镜头。该函数声明应该是这样的：

 函数[DllImport（foo.dll，CallingConvention = CallingConvention.Cdecl）
私人静态外部INT FUNC1（INT ARG1，出的IntPtr ARG2，楼盘INT ARG3）; 
  

和你这样称呼它：

  IntPtr的PTR = IntPtr.Zero; 
 INT说不上= 99; 
字符串结果= NULL; 
 
 INT RETVAL = func1的（42，出PTR，参考说不上来）; 
如果（RETVAL ==成功）{
结果= Marshal.PtrToStringAnsi（PTR）; 
 //等等...... 
} 
如果（PTR = IntPtr.Zero！）func1free（PTR）; 
  

在哪里func1free是释放字符串，否则未公开的函数。

I have to call a win32 dll function

int func1( int arg1, unsigned char **arg2, int *arg3);

and i need wrapped in c# as

public extern int fuc1(int arg1, out IntPtr arg2, out IntPtr arg3);

and i called it from a c# application as

int arg1;
IntPtr arg2 = IntPtr.Zero;
IntPtr arg3 = IntPtr.Zero;
func1(arg1,out arg2,out arg3);

Is the function declared in the c# wrapper as well as called in C# test app Correct ? Now i need to store the arg2 in a text file. How to do that.

Got answer from Hans and i wrote it in a file using

System.IO.StreamWriter(@Application.StartupPath + "\\Filename.txt");
file.WriteLine(arg2);
file.Close();

解决方案

i have a free function in the dll to clear the memory

Then you have a shot at making this work. The function declaration ought to look like this:

[DllImport("foo.dll", CallingConvention = CallingConvention.Cdecl)]
private static extern int func1(int arg1, out IntPtr arg2, ref int arg3);

And you'd call it like this:

IntPtr ptr = IntPtr.Zero;
int dunno = 99;
string result = null;

int retval = func1(42, out ptr, ref dunno);
if (retval == success) {
    result = Marshal.PtrToStringAnsi(ptr);
    // etc...
}
if (ptr != IntPtr.Zero) func1free(ptr);

Where "func1free" is the otherwise undocumented function that releases the string.

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