string & stringstream issue/Q?

hi,

I'm trying to improve some file loading & have the following;

Code:

        fHandle.seekg(0,std::ios::end); ////fHandle is fstream.
        std::streampos length = fHandle.tellg();
        fHandle.seekg(0,std::ios::beg);

        vector<char> buffer(length);
        fHandle.read(&buffer[0],length);

        stringstream streambuffer;
        //streambuffer.rdbuf()->pubsetbuf(&buffer[0],length); //1.0 crashes with this on large files ? Memory usage also increases substantially.

        //2.0 compiles & loads file except has issue with extracting data beyond first lot of bytes.
        string stringtemp = &buffer[0];
        streambuffer.str(stringtemp);


//data extraction
	unsigned int Data = 0;
	int filepos = 0;
	streambuffer.seekg(filepos);
        streambuffer.read((char*)&Data,4);
//data beyond this can not get extracted ? i.e. following will not extract data properly.

	filepos = 4;
	streambuffer.seekg(filepos);
        streambuffer.read((char*)&Data,4);

Problem is, one (1) alternative crashes on large files. The second (2) method has an issue with extracting data. So I'm wondering what am I doing wrong; or even, if there's a better/more efficient way of handling this.

Cheers

If this file is record based, you should focus on extracting all the records one at a time.

Originally Posted by whiteflags

If this file is record based, you should focus on extracting all the records one at a time.

The data is not records based, it varies between all different sorts of file types. And the large(er) file(s) where it crashes, is 700MB~ or so.