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Converting a struct to a char* (EASY)

Posted on 2002-07-17
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Last Modified: 2012-06-21
If have a struct of arrays.

struct myStruct
{
 char One[5];
 char Two[5];
 char Three[5];
 char Four[5];
};

How would I convert myStruct into a char* containing everything concatinated into one long string?  I can do it with repeated strcat() calls but thought there must be a much cleaner way to do it.

Thanks in advance.
-m
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Question by:mudface061200
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Accepted Solution

by:
kamarey earned 200 total points
ID: 7160295
struct myStruct
{
char One[5];
char Two[5];
char Three[5];
char Four[5];
};

int main()
{
    myStruct struct;

    char *p = (char*)&struct;

    ...
}
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Expert Comment

by:jkr
ID: 7160344
>>I can do it with repeated strcat() calls

This is in fact the way to do it, as every member of the struct is a zero-terminated C-style string, so that e.g. 'char *p = (char*)&struct;' would only render the 1st member...

Alternatively, you could use 'sprintf()' or a stringstream, e.g.

struct myStruct
{
char One[5];
char Two[5];
char Three[5];
char Four[5];
};

char* StringFromStruct ( struct myStruct* p, char* buf, unsigned long bufsize) {

 if ( bufsize < sizeof ( struct myStruct)) return NULL;

 sprintf ( buf, "%s %s %s %s", p->One, p->Two, p->Three, p->Four);

 return buf;
}
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Author Comment

by:mudface061200
ID: 7160392
Great!  That's exactly what I needed. Thanks for the quick reply!

-m
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Expert Comment

by:jkr
ID: 7160397
Er, ????
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Expert Comment

by:jkr
ID: 7160406
>>That's exactly what I needed

If you mean 'char *p = (char*)&struct;' - that won't work...
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Expert Comment

by:jkr
ID: 7160677
No response?
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Author Comment

by:mudface061200
ID: 7160953
char *p = (char*)&struct;

Works just fine.
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Expert Comment

by:jkr
ID: 7161060
*shrug* :o)
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Expert Comment

by:jkr
ID: 7161061
BTW, sorry to have bothered you - if it works for you, it is just fine :o)
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