Problem with reading a file

Rakesh5

Hi all, I want to read the content of the file.(say .txt) I am using Read method...But Its not reading the entire contents present in the file rather it reads around 50% of the file. ------------------------- Code Snippet: CStdioFile docfile; WCHAR* preadbuf; if(docfile.open(....)) docfile.read(preadbuf,docfile.getlength()); ------------ Please tell me how to solve this problem. please let me know if you have any queries.. Thanks, Rakesh.

_Superman_

Does CStdioFile have open and read methods? The length parameter to any read function is the amount of data to be read from the file. I believe there is some mistake here. The first parameter to the read function must be a buffer containing some memory and not just a pointer. Look at the example in the documentation of CFile::Read[^].

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Cedric Moonen

You never allocate preadbuf, so I'm really amazed that your code doesn't crash here...

Cédric Moonen Software developer
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shuzh

这个东西貌似很好弄袄

Michael Schubert

shuzh wrote:

这个东西貌似很好弄袄

Exactly.

Michael Schubert

First you should make up your mind if you want to read the file line by line or read the entire file into a buffer. In case of the former option use CStdioFile::ReadString() method, for the latter use CFile::Read().

David Crow

Rakesh5 wrote:

if(docfile.open(....)) docfile.read(preadbuf,docfile.getlength());

This will not even compile. If you want to know why a particular piece of code does not work, at least show the actual code.

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kakan

Just a thought. But here goes: You seems to read the file as Unicode, that way every character consists of two bytes in the file. If docfile.getlength() reports the file size in bytes, then you get your 50%. An example, suppose the file is 50 bytes. docfile.getlength() returns 50. But you can read 25 Unicode characters from it. Makes sense?

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