append data to memory mapped file in MapViewOfFile

Question

0.00/5 (No votes)

See more:

Hello guys,
I'm using MapViewOfFile to map a file and try to edit its data and save it on the file.
The problem I have extra data to the file required to expand its size.
So, how to append data to the end of memory mapped file using CreateFileMapping and MapViewOfFile?

Posted 24-May-13 6:30am

Rasool Ahmed

Add a Solution

Comments

Santhosh G_ 24-May-13 16:27pm

Do you want to change the file contents, by appending some data at the end of mapped file, right ?

Rasool Ahmed 24-May-13 23:18pm

Yes, I want to edit the middle of the content and append additional data to the end of the file, this will expand its size.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Santhosh G_ · Accepted Answer · 2013-05-24T18:33:00

Try to use the below method it create file mapping with large size and update the contents.

C++

DWORD nSize = GetFileSize( hFile, &nSizeH );
    int nRequiredSize = nSize + nAddedSize;// New size is calculated for file mapping.
    HANDLE hMapping = CreateFileMapping( hFile, 0, PAGE_READWRITE, 0,nRequiredSize,0 );
    CHAR* pData = (CHAR*)MapViewOfFile( hMapping, FILE_MAP_ALL_ACCESS, 0,0, 0 );
    // Append data to pData
    UnmapViewOfFile(pData);
    CloseHandle(hMapping);