[英]Wrapping native C++ code which uses a native interface in C++/CLI
我目前在尝试包装使用如下定义的本机C ++接口的本机C ++ API的一部分时遇到问题:
#pragma once
class BufferReaderInterface
{
public:
virtual ~BufferReaderInterface()
{
}
const static int BUFFER_SIZE = 100;
virtual void ReadNextBuffer(char* buffer) = 0;
};
然后,解析器类将其用于将数据读取到其本地缓冲区中,以用于以后的解析,如下所示:
#pragma once
#include "BufferReaderInterface.h"
class BufferParser
{
public:
void ReadNextBuffer(BufferReaderInterface& reader)
{
reader.ReadNextBuffer(localBuffer);
}
void ParseBuffer()
{
// do buffer parsing after ReadNextBuffer()...
}
private:
char localBuffer[BufferReaderInterface::BUFFER_SIZE];
};
这是用于从文件流读取缓冲区的示例实现(它不一定是文件流,也可以实现从网络读取):
#pragma once
#include <fstream>
#include "BufferReaderInterface.h"
class FileStreamBufferReader : public BufferReaderInterface
{
public:
FileStreamBufferReader(std::string filename)
{
bufferFile.open(filename.c_str(),
std::ios_base::in | std::ios_base::binary);
if(!bufferFile)
{
throw std::invalid_argument(filename);
}
}
~FileStreamBufferReader()
{
bufferFile.close();
}
void ReadNextBuffer(char* buffer)
{
bufferFile.read((char *)buffer, BUFFER_SIZE);
}
private:
std::ifstream bufferFile;
};
一个简单的用法如下:
BufferReaderInterface* br = new FileStreamBufferReader("test.binary");
BufferParser parser;
parser.ReadNextBuffer(*br);
parser.ParseBuffer();
// use parsed data...
delete br;
我应该如何包装BufferParser
类? 我正在尝试在其上使用Pimpl惯用语,但在正确实现ReadNextBuffer(BufferReaderInterface&)
函数的托管版本时ReadNextBuffer(BufferReaderInterface&)
。 我曾尝试创建一个public interface class ManagedBufferReaderInterface
,但后来我陷入困境,因为BufferParser
采用了本机C ++接口,而C ++ / CLI类无法实现像BufferReaderInterface
这样的本机C ++接口。 有人遇到过吗?
任何意见,将不胜感激!
如何使用抽象类而不是接口?
public ref class ManagedBufferReaderInterface abstract
{
private public: // internal
BufferReaderInterface * native_interface;
public:
ManagedBufferReaderInterface(BufferReaderInterface * nativeinterface)
: native_interface(nativeinterface)
{ ... }
//...
};
public ref class ManagedBufferParser
{
BufferParser * parser;
public:
ManagedBufferParser()
: parser(new BufferParser())
{ ... }
void ReadNextBuffer(ManagedBufferReaderInterface ^ reader)
{
parser->ReadNextBuffer(reader->native_interface);
}
void ParseBuffer()
{
parser->ParseBuffer();
}
//...
};
添加的代码:
#include <msclr\marshal_cppstd.h>
public ref class ManagedFileStreamBufferReader : public ManagedBufferReaderInterface
{
public:
ManagedFileStreamBufferReader(System::String ^ filename)
: ManagedBufferReaderInterface(new FileStreamBufferReader( msclr::interop::marshal_as<std::string>(filename) ) )
{ ... }
// ....
};
//Example
ManagedBufferReaderInterface ^ br = gcnew ManagedFileStreamBufferReader("test.binary");
ManagedBufferParser ^ parser = gcnew ManagedBufferParser();
parser->ReadNextBuffer(br);
parser->ParseBuffer();
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