char string to long conversion

Hello, I have the following question:

I am trying to fit a long variable into char string and then convert it back to long (need this to send that string over the network)

char cs[4];
long lv1=12345;
long lv2;

memcpy(cs, &lv1, 4);
lv2=(long)(tsC);

printf("lv2: %lu ", lv2);

for some reason this doesn't work

Thanks in advance,
Bill
:confused:

To change a long into a string, use sprintf. To change a string back into a long, use strtol. Nice and easy. :)

What about using sscanf( ) instead of strtol?

Thanks guys, seems to be working, just because of cuoriosity why the memcpy solution didn't work?

Thanks,
Bill:)

Quote:

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Originally posted by rastan
Thanks guys, seems to be working, just because of cuoriosity why the memcpy solution didn't work?

Thanks,
Bill:)

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Perhaps because...

Code:

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lv2=(long)(tsC);

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You have no 'tSC' variable in your example?

Oh, and because numbers aren't stored as strings. And if they were, the '1' in your example wouldn't be the first cell of your array, it would be the last to make math easier. Each digit wouldn't be a seperate character.

Quzah.

sorry I made a mistake while posting the code, actually I have "cs"
not "tsC"

Anyway I found the answer:
lv2=*(long*)&(cs);

Thanks to everybody,
Bill

with a few changes ur original code works

Code:

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char cs[4];
long lv1=12345;
long *lv2;

memcpy(cs, &lv1, 4);
lv2=(long*)(cs);

printf("lv2: %lu ", *lv2);

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Quote:

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Originally posted by rastan
I am trying to fit a long variable into char string and then convert it back to long (need this to send that string over the network)

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Is this any good for you:
http://www.ecst.csuchico.edu/~beej/g...t_old/#convert

Hammer, this is usefull staff but unfortunatelly not related to the question. Those functions convert byte orders in uint32_t /uint16_t variables but hey do not convert char[] to longs

Thanks,
Bill

Hammer's post was trying to help you further along the line since your question about string to long conversion was adequately answered previously.

>>long variable into char string and then convert it back to long (need this to send that string over the network)<<
This suggests to me your converting from a long to a char[] so that when you send it to the remote machine, it will receive a character based representation of a number. It will then convert it back to a long in its native form. Am I understanding you right? If so, the ntohl() type functions will take care of all that for you.