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How to read a .xls file?

Posted on 2004-08-10
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I need to open an excel file and then read each row of the file, how do I do this?
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Question by:prasen120998
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7 Comments
 
LVL 55

Expert Comment

by:Jaime Olivares
ID: 11769039
Need to be in pure C?
There are many examples in Visual C++:
http://www.codeproject.com/database/cspreadsheet.asp
http://www.codeproject.com/cpp/miniexcel.asp
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LVL 55

Expert Comment

by:Jaime Olivares
ID: 11769048
More:
http://www.codeproject.com/database/excel_odbc.asp

Also you can save a spreadsheet in Comma-Separated-Values format (.csv) and read as a simple text easily.
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LVL 22

Expert Comment

by:grg99
ID: 11771616
Above you'll see several ways to do it, mostly very cumbersome.

It's not easy to directly read the file, as it's ina rather convoluted BIFF format.  Plus there are about 8 different Excel file formats, it seems each version of Excel has changed things around a bit.

If you gotta do it, get the BIFF document from www.msdn.com and read up on the various file formats.  Plan to spend a good week writing code.

Alternatives include:  send DDE commands to a copy of Excel, have Excel write out a comma-delimited text file, or forget the whole thing.

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LVL 1

Expert Comment

by:ladwein
ID: 11774296
The best possibility (as jaime olivares already said) is to save the Excel file as .csv (with ';'  or 'tab' as field separator.)
Then you could simply read the file character by character to the end of each line. (line end has ascii code 10 or 13 - whatever excel uses; tab has ascii code 9)

#include <stdio.h>
#include <stdlib.h>

main()
{
   FILE *in;
   in = fopen ("yourfile.csv","r");
   while ((c=getc(in))!=EOF)  //read to EndOfFile
   {
      i=c;      //get ASCII value of current letter
      if (i!=10)      //read to end of line
      {
         if (i!=9) //read to next tab
         {
            ...
         }
         else
         {
            ...
         }
      }
      else //end of line reached
      {
         ...
      }
   }
   fclose(in);
}

Maybe you could tell what you want to do with the Excel File (Copy its content to the console, copy to another file, ...)

Michael
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Author Comment

by:prasen120998
ID: 11815530
The excel file would be provided by another system, & my program needs to read that file and create an output
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Accepted Solution

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modulo earned 0 total points
ID: 12902868
PAQed with points refunded (50)

modulo
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