Convert between IBuffer and Char*

Question

I want know how to convert form IBuffer to Char* And from Char* to IBuffer,waiting for the anwser:-)

Answer 1

To access the data in the buffer query the IBuffer for its IBufferByteAccess interface.

You can also read it out by loading it into a DataReader with DataReader.FromBuffer.

--Rob

Answer 2

How to query the  IBufferByteAccess interface?I mean I don't know its GUID... 

Answer 3

The linked documentation includes the appropriate header files. You can use the IID_PPV_ARGS Macro for the query

IUnknown* pUnk = reinterpret_cast<IUnknown*>(buffer);
	
IBufferByteAccess* pBufferByteAccess = nullptr;
HRESULT hr = pUnk->QueryInterface(IID_PPV_ARGS(pBufferByteAccess);

--Rob

Answer 4

This is the way to convert fro IBuffer to char*.

How to convert from char* to IBuffer?

Answer 5

You can copy the char* into the IBuffer with a DataWriter.

--Rob

Answer 6

Can you please explain how that can be done?

What stream object should be used to initialize DataWriter (stream object)?

After it is initialized, then I should write it byte by byte?

Thanks.

Answer 7

Sorry, my mistake. I got the DataWriter and DataReader capabilities mixed up.

To copy the char* in you'll have to get the Buffer with IBufferByteAccess .

--Rob

Answer 8

Hii,  Could you please give an illustrative example of convert from char* to IBuffer?

Thanks