Some guidance needed

[bostonmegarocker]

Hi to all?

For the past couples of weeks I have been programming to make a
program that reads a binary file and produces the equivalent text
file.

The idea is that each byte in the file represents a temperature that
can only go from 0 to 255. So I start by reading the file in to a
character array, and the do an int casting to obtain the value of each
file, so my code is something like this:

ifstream inFile("binary.dat");
ofstream outFile("binary.txt");

inFile.seekg(0, ios::end);
int size = inFile.tellg();
inFile.seekg(0, ios::beg);
char charArray[size];

inFile.read(charArray, size);

for(int= 0; i<size; i++)
{
outFile << (int)charArray[i] <<endl;
}

.... etc ...

I expected the output to range from 0 to 255, but I get values from
-128 to 127!!? and if I use (unsigned int) instead of (int) the output
is even worst.

Is there a better way to see what is the integer equivalent that each
byte holds ?

Regards,
Alexis
_______________________
bo**************@yahoo.com

[Min]

I assumed that 0-255 means, you don't have negative value.
Then try "unsigned char"

"bostonmegarocker" <bo**************@hotmail.com> wrote in message
news:6c**************************@posting.google.c om...

Hi to all?

For the past couples of weeks I have been programming to make a
program that reads a binary file and produces the equivalent text
file.

The idea is that each byte in the file represents a temperature that
can only go from 0 to 255. So I start by reading the file in to a
character array, and the do an int casting to obtain the value of each
file, so my code is something like this:

ifstream inFile("binary.dat");
ofstream outFile("binary.txt");

inFile.seekg(0, ios::end);
int size = inFile.tellg();
inFile.seekg(0, ios::beg);
char charArray[size];

inFile.read(charArray, size);

for(int= 0; i<size; i++)
{
outFile << (int)charArray[i] <<endl;
}

... etc ...

I expected the output to range from 0 to 255, but I get values from
-128 to 127!!? and if I use (unsigned int) instead of (int) the output
is even worst.

Is there a better way to see what is the integer equivalent that each
byte holds ?

Regards,
Alexis
_______________________
bo**************@yahoo.com

[bostonmegarocker]

Thanks Min,
That worked for me. I really appreciate your help.
- alexis

"Min" <no****@home.com> wrote in message news:<fY**********************@news2.calgary.shaw. ca>...

I assumed that 0-255 means, you don't have negative value.
Then try "unsigned char"

"bostonmegarocker" <bo**************@hotmail.com> wrote in message
news:6c**************************@posting.google.c om...

Hi to all?

For the past couples of weeks I have been programming to make a
program that reads a binary file and produces the equivalent text
file.

The idea is that each byte in the file represents a temperature that
can only go from 0 to 255. So I start by reading the file in to a
character array, and the do an int casting to obtain the value of each
file, so my code is something like this:

ifstream inFile("binary.dat");
ofstream outFile("binary.txt");

inFile.seekg(0, ios::end);
int size = inFile.tellg();
inFile.seekg(0, ios::beg);
char charArray[size];

inFile.read(charArray, size);

for(int= 0; i<size; i++)
{
outFile << (int)charArray[i] <<endl;
}

... etc ...

I expected the output to range from 0 to 255, but I get values from
-128 to 127!!? and if I use (unsigned int) instead of (int) the output
is even worst.

Is there a better way to see what is the integer equivalent that each
byte holds ?

Regards,
Alexis
_______________________
bo**************@yahoo.com