Re: memory pool?

I wrote some code and I have a problem that I can't open the picture.
Here is the simplified code:
----------------------------
//This part of the code pushes back every character to myPhoto vector

for(unsigned long i=0; i < Length; i++)
{
myPhoto.push_back(srcData[i]);
}
if(complete) //Write myPhoto vector to a file
{
ofstream outf("C:\\test_0.jpg");
for ( pos=myPhoto.begin()
; pos!=myPhoto.end()
; ++pos)
{
outf << *pos;
}
outf.close();
  }

//This part of the code append every chunk to the file
//It's for testing only
ofstream myFile ("C:\\test_1.jpg", ios::out | ios::binary | ios::app);
myFile.write ((char *)pProgress->pbData, pProgress->lLength);
myFile.close();
-----------------------------
What happens is that the first photo has 8 or 9 KB more than the second
one and it can't be opened.