copy string from one file to another

[rtnMichael]

hey,
I have a simple question, and I've been looking at this code for too long. I want to open up three seperate files, one to read, the other two to update. I have structures in the files that need to be changed from file1 to both file2 and file3. Now, file3 doesn't have the same structure, but I need to get the date in file1 to go to both of these other files...how can I do this?

Thanks
M

 

[marsd]

I'm not quite sure how your data structures are built or
what the file layout is, but it should be trivial to grab
the time you want ,cast to char *, and fprintf().

I get the idea that what you want is more complicated
for some reason tho...

 

[rtnMichael]

sorry for being so broad, I read my post after, and I came up with stuff I missed.

Here's the portion of code:

struct Header
{
char time_stamp[12];
char node_name[8];
int num_records;
int num_dotds;
char reserved[228];
};

static int getTimestamp(file1_path, file2_path, file3_path)
char *file1_path, *file2_path, *file3_path;
{
FILE *file1_fp, *file2_fp, *file3_fp;
struct Header file1_header, file2_header;

memset((char *)&file1_header, ' ', sizeof(file1_header));

if(!(file1_fp = fopen(file1_path, "rb&quot))
{
printf("Unable to open %s file.", file1_path);
return(1);
}

if(fread((char *)&file1_header, 1, 256, file1_fp) <= 0)
{
printf(&quot;Can not read file %s&quot;, dcutoken_path);
fclose(dcutoken_fp);
return(1);
}

................same code for files 2 and 3

strncpy(file1_header.time_stamp,file2_header.time_stamp, 12);

fclose(dcutoken_fp);
fclose(splitdata_fp);
fclose(splitstrtsend_fp);

so would I go about it with fprintf instead?

Would it look like this:
fprintf(file2_fp, &quot;%s&quot;, file1_header.time_stamp);


BTW file3's contains only the date so the whole file looks like this:
mmddyyhhmmss

Thanks

 

[rtnMichael]

ok, I think I got it, but I'm pretty sure there's a cleaner way to do it. Let me know what you guys think:

same code as before, then:

//open to read only//
if(!(file2_fp = fopen(file2_path, &quot;rb&quot))
{
printf(&quot;Unable to update %s file.&quot;, file2_path);
return(1);
}

strncpy(file2_header.time_stamp,file1_header.time_stamp, 12);

fprintf(file3_fp,&quot;%12.12s&quot;, file1_header.time_stamp);

//do I need to close before I reopen, or can I do a freopen
without having to close?//
fclose(file2_fp);

//now open it up to write//
if(!(file2_fp = fopen(file2_path, &quot;wb&quot))
{
printf(&quot;Unable to update %s file.&quot;, file2_path);
return(1);
}

if(!fwrite((char *)&file2_header, 1, sizeof(file2_header), file2_fp) )
{
printf(&quot;Can't write to file %s.&quot;, file2_path);
fclose(file1_fp);
fclose(file2_fp);
fclose(file3_fp);
return(1);
}

fclose(file1_fp);
fclose(file2_fp);
fclose(file3_fp);

...
}

Let me know if there's a better way to do it, or if this way, although I know not clean, is good enough.

Thanks
M