Question

I have this Structure the elements of which that I need to write in a text file

struct Stage3ADisplay
{
    int nSlot;
    char *Item;
    char *Type;
    int nIndex;
    unsigned char attributesMD[17]; //the last character is \0
    unsigned char contentsMD[17]; //only for regular files - //the last character is \0
};  

buffer = malloc(sizeof(Stage3ADisplayVar[nIterator]->nSlot) + sizeof(Stage3ADisplayVar[nIterator]->Item) + sizeof(Stage3ADisplayVar[nIterator]->Type) + sizeof(Stage3ADisplayVar[nIterator]->nIndex) + sizeof(Stage3ADisplayVar[nIterator]->attributesMD) + sizeof(Stage3ADisplayVar[nIterator]->contentsMD) + 1);

sprintf (buffer,"%d %s %s %d %x %x",Stage3ADisplayVar[nIterator]->nSlot, Stage3ADisplayVar[nIterator]->Item,Stage3ADisplayVar[nIterator]->Type,Stage3ADisplayVar[nIterator]->nIndex,Stage3ADisplayVar[nIterator]->attributesMD,Stage3ADisplayVar[nIterator]->contentsMD);

How do I make sure the rows in the file are properly aligned.
Thank you.

Answer 1

If your question relates to sprintf ,

Change

 sprintf (buffer,"%d %s %s %d %x %x"

to

 sprintf (buffer,"%22.22d %22.22s %22.22s %22.22d %22.22x %22.22x"

to see how %nn.nn works.