How to read text file?

Hello:
I study use VC++ 6.0 MFC ScrollView Class read a
text file .How to open the text file and read it use
VC++ program.I think it different with C program.
Can VC++ only read binary file?
How to start?
Would you help me ?
Thank you!

Yoh-Hei.

To read a text file, construct a CStdioFile object. Call its Open() method with the filename and CFile::modeRead|CFile::typeText as the attributes. Then call its ReadString() method until it returns FALSE (end of file). Then call its Close() method. Like this:

---
BOOL bReadOK ;
CStdioFile filInput ;
CString strText ;

if (filInput.Open("c:\\text\\somefile.txt",
CFile::modeRead|CFile::typeText) )
{
while (TRUE)
{
bReadOK = filInput.ReadString(strText);
if (!bReadOK)
break ; // EOF.

// Do something with the string read here...
}

filClose();
}


---

How's that?

Hello:
Mr. Jason Teagle Thank you very much!
I'm testing your advice.But I first time use the CStdioFile.
It'S need study (Exp:How to control the read one data of
one time,endln...)
If are there examples about use this on internet?
I use VC++ 6.0 MFC ScrollView class.
Thank you again!

Yoh-Hei.

I'm not quite sure what you mean, but if it helps, each call to ReadString() reads just one line of the text file at a time - up to the <CR><LF> at the end of the line.

If you want more help with CStdioFile, CString and text files, e-mail me at [email protected] and I'll gladly help you.

Hi, Jason Teagle

I'm using readstring command to read in data from textfile too.But for my case my data are separated by tab . But Readstring only allows me to read in the data before tab and ignore the rest.
Eg.

fmap famp1 famp2.

It can only managed to read in famp.

What shld i do? thanks

I'm not sure what has gone wrong for you, but I just ran a quick test to confirm what I believed - ReadString() should and does (for me) read in the whole line, tabs and all - all pieces of data from that one line in the file appear.

I attach a GIF showing my VC environment, proving it should work - notice that the tabs show as little blocks in "strLine" in the variable window.

Can you perhaps create a completely new project and test JUST that part (open a file and read a line), and if it still fails, show us the code to open the file and read it?

Hi, i've got that part working already.. Thanks..
But the tab are represented by a small block. Can i know how to
extract out the data that are separated by the tab.
eg for your case
This|is|a|test // | represent tab
i need the word "this" to go to 1 edit box
"is" to another, etc.

Thank U for ur precious help

Assuming the string with tabs is in a CString object called strLine:

Code:

---

CString  strNextToken ;

strNextToken = strLine.SpanExcluding("\t");

---

The above line, if called repeatedly, will break off one word at a time for you.

Quote:

---

Originally posted by zephyr79
Hi, i've got that part working already.. Thanks..
But the tab are represented by a small block. Can i know how to
extract out the data that are separated by the tab.
eg for your case
This|is|a|test // | represent tab
i need the word "this" to go to 1 edit box
"is" to another, etc.

Thank U for ur precious help

---

Use AfxExtractSubString as explained over here. I use it to read files with data separated with tabs. If you have any questions, feel free to ask.

Hi, thanks.
i've found another method is to use Find and ReverseFind method. might not be very efficient but it does works too. Thanks. :)