replace

[giahan]

Hi,

I have a txt file (inFile.txt) that has int_1 int_2 int_3 .... ... int_n where n is unknown. Is there anyway that I can replace value int_3 by (int_3-100) without using a temporary file? Any hint/help would be appreciated.

Thanks
GH

 

[Zyrenthian]

If you read it all into a buffer made from CString it should work with the CString::Replace function.

CString str;
LPTSTR ptr = str.GetBuffer(LENGTH);
read the file into the buffer
str.ReleaseBuffer();
str.Replace("int_3","int_3-100);


That should do it.

Matt

 

[giahan]

Thanks Matt.

Because my infile.txt is too big and I also need to copy and rename infile.txt as outfile.txt, I use fgets function to get line by line and use the "sscanf" to assign the value and change the variable as well as its value.

GH

 

[cami58]

There is many ways to do what you want and I think the simple is do it whith a CString cause it facilitate the search. Here is ,at the glance what could it be like.
I hope it will be helpfull.

Suppose you have opened your textfile Using a CFile file

CString str;
LPSTR wherToRead=str.GetBuffer(file.GetLength()); // define memory where to read the file


file.Read(whereToRead,file.GetLength()); // reading the file


str.ReleaseBuffer();

// Do what you want to do with the file
// And now the search
int startSearch=0; // where to start the search , first from the begining 0
int positionFound=0; // The position of the found occurence

while(1)
{
positionFound=str.Find("int_",startSearch);
if(positionFound==-1) break; // if not found go out
str.Insert(positionFound+5,"-100" // insert what you want at the position found + number of the occurence here int_x=5 characters modify it as you like
startSearch=positionFound+5;
}

// now writing the new file
LPSTR fromToWrite=str.GetBuffer(str.GetLength());
file.Write(fromToWrite,str.GetLength());
str.ReleaseBuffer();
.........
c.ami@caramail.com