Not re-writing to a text file.

I have had a small program written for me that writes information to a text file and then uses it again later. I have tried to contact the original programmer but haven't been successful :(

My problem is that the text file is open at the start of the program

Code:

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fp = fopen("C:\\info.txt", "w");  //'W' should wipe any info already in file, 'A' is for append

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but the following code is used to put the information into the text file

Code:

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fflush(fp);
char *szData = g_Data.GetString();
fprintf(fp, szData);

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which results on the information being appended to info.txt, not what I was after!

My problem is - How do I delete what's in the file before I write the data to the file?

Use fseek() to move the 'cursor' for the next read/write operation.

> fprintf(fp, szData);
If your data contains a % character, you're sunk!

I'm sorry but I don't know how to program this :( I have tried to learn from google and the best I have got is

Quote:

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char *szData = g_Data.GetString();
fseek(szData, 0, SEEK_SET);
fprintf(fp, szData); //Print to file
fflush(fp);

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but this returns the error

Quote:

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error C2664: 'fseek' : cannot convert parameter 1 from 'char *' to 'struct _iobuf *'

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use rewind(FILE *file)...

Also, "w" stands for "write", not "wipe".. You could also try using "r+", but rewind should be enough for you.

Code:

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char *szData = g_Data.GetString();
fseek(szData, 0, SEEK_SET);
fprintf(fp, szData); //Print to file
fflush(fp);

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What are you trying to do? As far as I remember(forgive me if Im wrong), the first parameter should be a FILE pointer. So fseek(FILE *, 0, SEEK_SET). Isnt szData the data to be written using fprintf?

Got it working now, thanks for the help :)