strcat problem

[javaeyes]

Seems so simple but I have been pulling my hair out:
I'm just trying to create one long char from 2 short chars. Looks like this:

 // IN STRUCT DEFINITION 
// char imagename[30];

char dir[40];
dir = strcat( "pngimg/", option.imagename );

Compiler: incompatible types when assigning to type âchar[40]â from type âchar *â

I feel its some kind of pointer dereferencing thing, but I'm still a noob with pointers. Thanks!

[jimblumberg]

You are trying to use a constant string for your destination string ("pngimg/"), you probably have your parameters reversed.

Jim

[javaeyes]

Tried reversing parameters, same problem. Any other ideas? Thank you.

[rags_to_riches]

You can't assign to an array like that.

#include <stdio.h>
...
char dir[40]; // Probably too small
sprintf("pngimg/%s", option.imagename);

[jimblumberg]

How is option.imagename defined? You probably need to copy the first part of your "new" string to your dir variable with strcpy(), then use strcat() to append option.imagename to dir. Something like:

char dir[40];
strcpy(dir, "pngimg/");
strcat( dir, option.imagename );

Make sure "dir" is big enough to hold your two strings.

Jim

[javaeyes]

Thank you jim blumberg!!! You're the man.

[rags_to_riches]

Damn, I hosed that code...

#include <stdio.h>
...
char dir[40]; // Probably too small
sprintf(dir, "pngimg/%s", option.imagename);