[英]How transferring an image to buffer in c++(dll) and then read/write in buffer in C#?
How transferring an image to buffer in c++(dll) and then read/write in buffer in C# and return to c++(dll) in real time? 如何将图像传输到c ++(dll)中的缓冲区,然后在C#中读取/写入缓冲区并实时返回c ++(dll)? The process I'm looking is in the following :
我正在寻找的过程如下:
1- First, I read an image form hard drive; 1-首先,我从硬盘读取图像; Mat inputImage = read(“/,…./Test.jpg”);
Mat inputImage = read(“ /,..../ Test.jpg”);
2- Put in the buffer: 2-放入缓冲区:
imencode(".jpg", inputImage, inputBuff, paramBuffer); imencode(“。jpg”,inputImage,inputBuff,paramBuffer);
3- send form c++ to c# ??? 3-将表单C ++发送到C#??? (I don't know).
(我不知道)。
4- read in c# from buffer ??? 4-从缓冲区中读取C#??? (I don't know).
(我不知道)。
5- write the changes that happens through c++ and c# in buffer ??? 5-将通过c ++和c#发生的更改写入缓冲区??? (I don't know).
(我不知道)。
I'm using Opencv c++. 我正在使用Opencv c ++。
I really thank you. 我真的很谢谢你
You can use System.Runtime.InteropServices
in C# to call functions in external libraries, for example 您可以使用C#中的
System.Runtime.InteropServices
来调用外部库中的函数,例如
c++ code C ++代码
extern "c"
{
__declspec(dllexport) void __cdecl Read(unsigned char*& buffer)
{
//allocate and write to buffer
}
__declspec(dllexport) void __cdecl Write(unsigned char* buffer)
{
//do something with the buffer
}
}
and compile it into a dll 并编译成dll
C# code C#代码
using System.Runtime.InteropServices;
class Main
{
[DllImport(DLL_FILE, CallingConvention = CallingConvention.Cdecl)]
private static extern void Read(out IntPtr buffer);
[DllImport(DLL_FILE, CallingConvention = CallingConvention.Cdecl)]
private static extern void Write(byte[] buffer);
public static void ReadFromExtern()
{
IntPtr bufferPtr = IntPtr.Zero;
Read(bufferPtr);
int length = LENGTH;
byte[] buffer = new byte[length];
Marshal.Copy(bufferPtr, buffer, 0, length);
//do something with buffer
}
public static void WriteToExtern(byte[] buffer)
{
Write(buffer);
//or do something else
}
}
Note: 注意:
If you used dynamically allocated memory in the c++ code, remember to also write a wrapper function to free it, otherwise causing memory leak. 如果在c ++代码中使用了动态分配的内存,请记住还要编写一个包装函数以释放它,否则会导致内存泄漏。
__declspec(dllexport)
is Windows specific to export functions to dll(s). __declspec(dllexport)
是Windows专用的,用于将函数导出到dll。
extern "C"
is to avoid name mangling by c++ compilers, can be omitted if using c compilers extern "C"
避免了c ++编译器的名称处理,如果使用c编译器,则可以省略
For string transferring, use char*
in c++ and System.Text.StringBuilder
in c# 对于字符串传输,请在c ++中使用
char*
并在c#中使用System.Text.StringBuilder
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