Passing void parametre

[BorlandDave]

I have some code to edit which I don't fully understand. Here it is...

struct TDelrecs_tbl{
int table_no;
int pk1, pk2;
};

void function1(void){
TDelrecs_tbl delrec;

delrec.table_no=1;
delrec.pk1=2;
delrec.pk2=3;

function2(&delrec);
}

void function2(void *dbstruct){
pFile = fopen("C:\\DAVE_function2.txt","a+");
fprintf(pFile,"%i,%i,%i\n",dbstruct.table_no,dbstruct.pk1,dbstruct.pk2);
fclose(pFile);
}

I'm just trying to write out the variables of the struct to a file in the second function. The way the struct is passed between functions can't be changed. Can anyone make this work? Cheers.

 

[BorlandDave]

Just noticed I missed the line: FILE *pFile; at the top of the second function. Just letting you know that isn't the cause of the problem! I've never seen a void parametre used before.

 

[BorlandDave]

Nevermind. I think I've just worked it out! By recieving the parametre as a void, the program just recognises it as a raw pointer to a memory address.

To access the struct data, I must first cast the pointer as a pointer to a TDelrecs_tbl structure by:

*(TDelrecs_tbl *) dbstruct

 

[Totte]

There you go! Is there anything more i can help with? ;-)

Totte
Keep making it perfect and it will end up broken.

 

[BorlandDave]

I'm sure there will be. Just give it time!