Writing std::iostream to MemoryStream

  • Thread starter Thread starter Guest
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G

Guest

Hi,

I have an unmanaged iostream type that I need to copy to MemoryStream
(managed). Will appreciate if somebody can provide me the best/fastest
approach. This is what I have.

std::iostream *pStream = getStream();

//I need to copy the data pointed by pStream to MemoryStream
System::IO::MemoryStream ^mStream = gcnew System::IO::MemoryStream()

Thanks for the help.
 
Haxan said:
I have an unmanaged iostream type that I need to copy to MemoryStream
(managed). Will appreciate if somebody can provide me the best/fastest
approach.
Click to expand...

Probably you could call SetLength to set the MemoryStream's size, and
then pin its buffer and use iostream to read directly into MemoryStream.
Something like this should work:

System::IO::MemoryStream ^ mStream = gcnew System::IO::MemoryStream;
mStream->SetLength(bytes_to_read);
pin_ptr<unsigned char> pp(&mStream->GetBuffer()[0]);
std::iostream * pStream = getStream();
pStream->read(reinterpret_cast<char*>(pp), bytes_to_read);

I've done the opposite before: I was writing to MemoryStream from
managed code, pinned it, and read its content from native code, and it
worked fine.

Tom
 
Thanks Tamas, that is really helpful.

Tamas Demjen said:
Haxan said:
I have an unmanaged iostream type that I need to copy to MemoryStream
(managed). Will appreciate if somebody can provide me the best/fastest
approach.
Click to expand...

Probably you could call SetLength to set the MemoryStream's size, and
then pin its buffer and use iostream to read directly into MemoryStream.
Something like this should work:

System::IO::MemoryStream ^ mStream = gcnew System::IO::MemoryStream;
mStream->SetLength(bytes_to_read);
pin_ptr<unsigned char> pp(&mStream->GetBuffer()[0]);
std::iostream * pStream = getStream();
pStream->read(reinterpret_cast<char*>(pp), bytes_to_read);

I've done the opposite before: I was writing to MemoryStream from
managed code, pinned it, and read its content from native code, and it
worked fine.

Tom
Click to expand...
 
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