CODEWITHSUNDEEP
c++file-iomfcbinaryfilescfile
Jakob
Jakob

Reputation: 808

How can I read a CLongBinary field from my database and write it into a CFile object?

im using a CRecordset to get data from my SQL Server. One table stores a binary file (pdf, odt, ...). My VisualStudio maps the columns to a CLongBinary field.

How can I read and open the file from the CLongBinary field?

im using some ancient version 4.2 of MFC, VisualStudio 6.0

Upvotes: 2

Views: 628

Answers (1)

Jabberwocky
Jabberwocky

Reputation: 50774

Do something like this. This will just give you an idea. I haven't tested the code.

CLongBinary myfield ;

... retrive myfield from database here


BYTE *dataptr = (BYTE*)GlobalLock(myfield.m_hData) ;

// now dataptr points to your raw data, and myfield.m_dwDataLength is the length of that data

CString tempname = ... create temporary filename somewhere
CFile myfile ;
myfile.Open(tempfilename, CFile::modeCreate|CFile::modeWrite);
myfile.Write(dataptr, myfield.m_dwDataLength) ,
myfile.Close() ;
GlobalUnlock(myfield.m_hData) ;

ShellExecute(NULL, _T("open"), tempfilename, NULL, NULL, SW_SHOW) ;

Upvotes: 4

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