fstream

[kk tvm]

Hi In my program, i use read/write mode for file operation. But it not working properly. Code as follows fstream f("temp.txt",ios::app | ios::in ) kindly help thanks

KK

[Cedric Moonen]

kk.in wrote:

But it not working properly

Fine, and we are supposed to guess what is going wrong ? And what you are expecting ?

kk.in wrote:

ios::app | ios::in

You know that you will only be able to read the file (and I don't know why you used ios::app here, this is only usefull when writing to the file).

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Cédric Moonen Software developer
Charting control [Updated - v1.1]

[mpk1979]

i think you need to use fstream f("temp.txt",ios::out | ios::in ), then it will work i think mpk1979

[kk tvm]

Hi The real problem is I have a text file with some data, I want to edit data from a particular position,it without using temperory file. I try to edit the data and it will added to end of the file ? thanx

KK

[Cedric Moonen]

You need to use the ios::out flag if you want to write something to the file (otherwise it is read-only)

kk.in wrote:

I have a text file with some data, I want to edit data from a particular position,it without using temperory file.

You can't do that, you cannot insert data at a certain position (only write on it but you won't be able to insert extra characters).

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Cédric Moonen Software developer
Charting control [Updated - v1.1]

[David Crow]

kk.in wrote:

I have a text file with some data, I want to edit data from a particular position,it without using temperory file.

While you can certainly change text (e.g., replace dog with cat)without using a temporary file, you cannot make the file any smaller/larger without using a temporary file (there are a few exceptions to this).

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