ifstream read binary data issue 0x00 byte

Question

Hi everyone i have an issue while reading binary data from a binary file as following:

File Content: D3 EE EE 00 00 01 D7 C4 D9 40

char * afpContentBlock = new char[10];
ifstream inputStream(sInputFile, ios::in|ios::binary);

if (inputStream.is_open()))
{
    inputStream.read(afpContentBlock, 10);

    int n = sizeof(afpContentBlock)/sizeof(afpContentBlock[0]); // Print 4

    // Here i would like to check every byte, but no matter how i convert the 
    // char[] afpContentBlock, it always cut at first byte 0x00.
}

I know this happens cause of the byte 0x00. Is there a way to manage it somehow ? I have tried to write it with an ofstream object, and it works fine since it writes out the whole 10 bytes. Anyway i would like to loop through the whole byte array to check bytes value.

Thank you very much.

The usual reply is "why aren't you using vector?" (and I'm quite certain sizeof(afpContentBlock)/sizeof(afpContentBlock[0]) is not 7, but 4 or 8). — R. Martinho Fernandes
– R. Martinho Fernandes, Commented Aug 8, 2012 at 11:01
I had fixed the file content (it was wrong).A code snippet would really be helpful and appreciated since i am really not used yet to vector. — Duncan_McCloud
– Duncan_McCloud, Commented Aug 8, 2012 at 12:11

steveg89 · Accepted Answer · 2012-08-08 12:13:05Z

2

It's much easier to just get how many bytes you read from the ifstream like so:

if (inputStream.is_open()))
{
   inputStream.read(afpContentBlock, 10);
   int bytesRead = (int)inputStream.gcount();

   for( int i = 0; i < bytesRead; i++ )
   {
      // check each byte however you want
      // access with afpContentBlock[i]
   }
}

edited Aug 8, 2012 at 12:13

answered Aug 8, 2012 at 11:06

steveg89

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1 Comment

steveg89 Over a year ago

@Duncan_McCloud You're right, edited to fix that. Been a while lol.

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