在C#项目中使用C ++库 [英] Using c++ library in c# project

问题描述

大家好；

我在EA15条码读取器OEM设备中需要一个C#条码读取器程序.我搜寻了很多东西，但我找不到.所以我开始在我的C#项目中使用EA15 c ++库.我需要将指针发送到inputbuffer，但是我不能这样做.这就是:

*我需要使用的c ++函数:

hi all;

I need a c# barcode reader program in EA15 barcode reader oem device. I search a lot to find but i cant. So i start to use EA15 c++ library in my c# project. I need to send pointer to inputbuffer but i cant do that. Here all is:

* c++ function that i need to use :

unsigned short ControlCommand (
  unsigned char *pInputBuffer,
  unsigned long nBytesInInputBuffer,
  unsigned char *pOutputBuffer,
  unsigned long nSizeOfOutputBuffer,
  unsigned long *pnBytesReturned
);

*输入缓冲区是->
pInputBuffer:指向包含ControlCommand帧(GID FID PRM…)的输入缓冲区的指针.
*在c ++程序中，对于此功能，代码如下:

* the input buffer is -->
pInputBuffer : Pointer to the input buffer containing the ControlCommand frame (GID FID PRM …).

* in c++ program, for this function, the code is like this:

char[] InputBuffer[0]=0x20;
InputBuffer[1]=0x40;
InputBuffer[2]=0x01;

*我在C#中的代码是这样的:

* my code in c# is like this:

//Definition of dll and function -->
[DllImport("ISDC_RS.dll")]
public static extern short ControlCommand(string a, int b, string c, int d, int e);
 
//Calling function -->
string x = ControlCommand(?????, 3, ?????, 20, 0).ToString();

我可以发送数据到哪种格式的功能?

最好的问候；
Aykut

in which format that i can send data to function?

Best regards;
Aykut

推荐答案

除了Richard MacCutchan的回答很好，在解决方案1中:

您应该有一个本地DLL文件.您已经拥有它，或者可以将其制作出C ++库.

然后，您可以在C#应用程序中通过P/Invoke使用它.一些更有用的链接来学习P/Invoke:
http://en.wikipedia.org/wiki/P/Invoke [ http://msdn.microsoft.com/library/en-us/vcmxspec/html/vcmg_PlatformInvocationServices.asp [^ ].

此CodeProject文章也可能有用:
基本P/调用 [ http://en.wikipedia.org/wiki/C%2B%2B/CLI [ ^ ]，
http://www.gotw.ca/publications/C++CLIRationale.pdf [ ^ ]，
http://www.ecma-international.org/publications/standards/Ecma-372.htm [^ ]，
http://msdn.microsoft.com/en-us/library/dtefa218 [ ^ ]，
http://msdn.microsoft.com/en-us/library/3bstk3k5 [ ^ ].

-SA

In addition to the good answer by Richard MacCutchan, in Solution 1:

You should have a native DLL file. You either have it already or can make it out of your C++ library.

Then you can use it through P/Invoke in your C# application. Some more useful link to learn P/Invoke:
http://en.wikipedia.org/wiki/P/Invoke[^],
http://msdn.microsoft.com/library/en-us/vcmxspec/html/vcmg_PlatformInvocationServices.asp[^].

This CodeProject article can also be useful:
Essential P/Invoke[^].

The alternative way is using C++/CLI. You can create a mixed-mode (managed + unmanaged) project which can use your C++ library. You can wrap your unmanaged library functions in some managed "ref" C++/CLI structures or classes and make the public. This way, the output of this project can be used as a regular .NET assembly, for example, referenced by your C# project. Please see:
http://en.wikipedia.org/wiki/C%2B%2B/CLI[^],
http://www.gotw.ca/publications/C++CLIRationale.pdf[^],
http://www.ecma-international.org/publications/standards/Ecma-372.htm[^],
http://msdn.microsoft.com/en-us/library/dtefa218[^],
http://msdn.microsoft.com/en-us/library/3bstk3k5[^].

—SA

请参见

See the P/Invoke tutorial[^] for details of parameter passing between C# and C++.

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