WHat is wrong here?

I cannot answer your question, but maybe someone else can in a forum related to MFC. This is a Non Visual C++ forum.

Memory for buffer doesn't appear to be allocated. What does writeToBuff do? What is sizebuf? Where does it get set?

Why are you even trying to use a CArchive to read when you didn't use one to write?

I am sorry for being uncomplete in my code. This is a more exactly code;

bool CTest::save(CMemFile *_f) {

unsigned char *buf = NULL;

//img is a representation of an image

savetiftobuffer(&buf,&img,0);

_f->write((void*)buf,(UINT)sizebuf);

return true;
}

Then somewhere else I try to read the content of that CMemFile through CArchive (this is only a simplified code)

CArchive ar(&mf,CArchive::load);

//sizeBuf is the size of the buffer, got this value just above this
//code snippet

unsigned char *buffer = new unsigned char[sizeBuf];

for (int i = 0; i < sizeBuf; i++) {
ar >> *(buffer+i);
}


This is not the right way to get the unsigned char* from the CArchive. What am I doing wrong here?

Should i get it more like this;

ar>>buffer;

The problem is anyway that the correct data doesnt come through!

Thanks for your input!

I used the CArchive to write some data, basically CString variables. These data have already been succesfully read. Remember, this is only an extract of the code, and above the code you can see I write to the CArchive as well!

So anyone with any tips?

Thanks for commenting!