Converting Hex data to Decimal in WAVE files.

Alright so what I'm trying to do is read the data chunks from a .WAV file and convert each chunk to decimal (0 - 65535 was the original range) so that I can manipulate it and use it with my micro controller. Anyway, I'm using fstream and reading the entire contents to a memory block, then unloading the file and transferring data from the memory block to the new file. There only seems to be one problem, the strtol function is not converting the hex data to decimal. I believe it may be because the hex data is being read as ASCII rather than hex values, i.e.  ÷¾ instead of f7be. This is the code I am using to process the data.

for (int i=44; i<dloop; i=i+2)
    {
        // Prepare hex values
        temp[0] = memblock[i+1];
        temp[1] = memblock[i];
        temp[2] = 0;

        // Convert hex to dec
        conv = strtol(temp,&pEnd,16);
        save << temp << " " << conv << "\n";
    }

It outputs the raw hex code then puts a space, then outputs the converted decimal values. This is the output.

ök 0
÷ 0
÷¾ 0
ø+ 0
øT 0

etc
Any suggestions? Also the reversing of the hex bytes before converting is intentional.

I know this is a slow moving board, but can I get some help with this? Surely someone knows an easy way around this?

HOW ABOUT NO

this board is not about programming, it just appears to be.

>>4
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>>5
fuck off and die in a fire you cock sucking faggot.

>>6
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>>7
WATCH YOUR PRIVILEGE, MALE PROGRAMMER.

Wow stop being arseholes, this dude comes in asking for help and none of you comply?
You wonder why we don't get much traffic.
Also I cannot help you as I do not do C related languages, sorry.

>>9
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>>10
I AM a FEM PROGRAMMER you WORTHLESS PIECE OF SHIT, now shut the fuck up.

>>11
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>>12
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wow fuck you all I'm going to go ask /g/, cunts.

>>14
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fucking slow ass spambot

>>16
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>>14
ask anyone you want fucking faggot, now GTFO already.

>>1
I'm not so sure I understand what you're trying to do. According to this:
http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/WAVE/WAVE.html

.wav stores binary binary data in the little endian order, rather than text data. So you have no reason to use strtol, which converts text data to long ints.

Typically you'd just read the data into an array of char (with the assumption that CHAR_BIT == 8) using a function like fread(), then convert the data from the array of char to an unsigned integer (in the host format) which is large enough to store the result.

Consider using the following macros for packing an integer in the host format, into an array 2 of char in the little endian order (which can be used with fwrite()):


#define packle16(b, n) \
        do {                                    \
                (b)[0] = (n) & 0xff;            \
                (b)[1] = (n) >> 8 & 0xff;       \
        } while(0)

And this one for unpacking an array 2 of char in the little endian order into the host format:


#define unpackle16(b) ((unsigned int) (b)[1] << 8 | (unsigned int) (b)[0])

>>19
don't help him!

>>20
WATCH YOUR PRIVILEGE, MALE PROGRAMMER.

Here's an example of reading a 16-bit little endian integer from stdin, converting it to the host order, then printing it in hexadecimal and decimal.


#include <stdio.h>

#define unpackle16(b) ((unsigned int) (b)[1] << 8 | (unsigned int) (b)[0])

int main(void)
{
    unsigned char data[2];
    unsigned int n;

    if (fread(data, sizeof data, 1, stdin) != 1)
        return 0;
    n = unpackle16(data);
    printf("%u %x\n", n, n);
    return 0;
}

>>20
It's nice to have a balance of helpful posts and shitposts. ^_^

>>22
WATCH YOUR PRIVILEGE, MALE PROGRAMMER.

>>23
WATCH YOUR PRIVILEGE, MALE PROGRAMMER.

thanks for nothing!

fuck this board is dead as fuck

Hey OP here, glad I didn't close this tab, /g/ was no help. So thanks to the guy/girl who actually posted an example!

>>28
fuck you faggot im not a girl

please kindly read this site:
http://geekfeminism.wikia.com/wiki/Male_Programmer_Privilege_Checklist
thanks for your cooperation

>>29
People on here are bitching about men so what ever, had to accommodate for both.
>>30
Is this a joke?

>>31
JUST BE SURE TO CHECK YOUR PRIVILEGE FAGGOT

>>33
nice doubles, faggot

>>32
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>>32
Fuck off, I do what I want.

>>33
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>>35
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Oh shit the spambot is spamming itself

>>37
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>>38
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FUCKING SEXIST PIGS. WOMEN CAN BE PROGRAMMERS TOO.

>>40
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>>41
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>>42
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>>43
WYPMP

WATCH YOUR PRIVILEGE, FEMINIST SPAMMER.

NYJMUA

>>40
WATCH YOUR PRIVILEGE, FEMALE PROGRAMMER.

save << temp << " " << conv << "\n";
This is what happens when we teach high-level languages before basic stuff like data representation.

OP needs to learn a whole lot more of the latter first.