Forms in C 1

[DanJC]

I am attempting to create a form in C using the following concept.

I create a field struct:

struct field
{
  int index;
  void *point_to_data;
  char *caption;
  int hor_pos, ver_pos;
} myform[15];

I also create a record struct to store data;

struct myrec
{
  char *item1;
  char *item2;
  struct myrec *next;
} *rec1;

Can I point the void item 'point_to_data' to item1, item2 etc..? to transfer data from screen to an input segment?

If anyone can tell me how to point 'point_to_data' to the data item I would be a very happy bunny.

Dan.

'All good things might seem good at first but at the end of the day they are just things...'

 

[Jay1Roy]

Hey Dan,

Well, generic pointers can be used to work with any data type but proper precaution needs to be taken. I hope the following code snippet would help.

	void *vp;
	char *s="This is a string!";
	int len;

len=strlen(s)-1;

vp = (char *)s;

for(;len>=0;len--)
	printf("%c",*((char *)vp+len));

This code prints the string message in Reverse (!gnirts a...) Let me know if it was helpful!

have fun coding... ;-)

Roy.

 

[rjr9999]

Is this what you meant?

struct field
{
  int index;
  struct myrec *point_to_data;
  char *caption;
  int hor_pos, ver_pos;
} myform[15];

struct myrec
{
  char *item1;
  char *item2;
  struct myrec *next;
} *rec1;

struct field *MyField;

MyField->point_to_data.item1

Rob
"Programming is like art...It makes me feel like chopping my ear off."

Http://www.thisisrisk.com/

- Currently down

 

[DanJC]

Not quite, I want point_to_data to point to one of the data members of the rec1, not the whole record.

The idea is to have the form showing one record at a time.

This means that each field in the form should be one part of struct myrec.

If only my assignment would allow me to use C++!!!

"Flying by the seat of your pants is fun, but it's much safer by aircraft..."

DanJC

 

[rjr9999]

Well useing RoyOboy's meathod...

struct myrec *MyRecord;
struct field *MyField;

MyRecord.item1 = (char *)MyField[index].point_to_data;

Does that work for ya? Sorry if this is sloppy, i'm at work so it's quick responses ;-)



Rob
"Programming is like art...It makes me feel like chopping my ear off."

Http://www.thisisrisk.com/

- Currently down

 

[DanJC]

That makes sense,

thanks.

 

[rjr9999]

There's a star for ya RoyOBoy... Rob
"Programming is like art...It makes me feel like chopping my ear off."

Http://www.thisisrisk.com/

- Currently down