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Reading a file...

Posted on 2004-04-05
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Last Modified: 2013-11-20
Using MFC VC++6, I created a file which has the character 'a' at position 1.  I want to read the file and convert it  to a CString  and then display it to a message box.

Here is the code I have been working with.

const int MAX_STRING_LENGTH = 10;
CString MyString;
CFile MyFile;
MyFile.Open("...MyfilePath", CFile::modeNoTruncate | CFile::modeRead   );

char* TempBuf = MyString.GetBuffer(MAX_STRING_LENGTH);
UINT NumChars = MyFile.Read((void FAR*) TempBuf, MAX_STRING_LENGTH - 1);
 MyString.ReleaseBuffer(NumChars);

 AfxMessageBox(MyString);

I get a run time exception error when I run this code.

Is there an easier way to do this?

Thanks,
RABMissouri
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Comment
Question by:rabmissouri
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5 Comments
 
LVL 48

Accepted Solution

by:
AlexFM earned 400 total points
ID: 10756677
Add 0 to the end of string:

UINT NumChars = MyFile.Read((void FAR*) TempBuf, MAX_STRING_LENGTH - 1);
TempBuf[NumChars] = 0;
0
 
LVL 48

Expert Comment

by:AlexFM
ID: 10756686
Another way is using CStdioFile Class which has ReadString member:

BOOL ReadString(CString& rString);
0
 

Author Comment

by:rabmissouri
ID: 10762285
It works.  Thanks.  I think my main difficulty was converting a char array to a CString.  Is there an easy way to do this?  Why did you have me add the line "TempBuff[NumChars]=0"

Thanks again,
RABMissouri
0
 

Expert Comment

by:palani_vs
ID: 10764669
Hi
if u want to just assign a char array to cstring, u can use Format function.

vs
0
 
LVL 48

Expert Comment

by:AlexFM
ID: 10766133
Why did you have me add the line "TempBuff[NumChars]=0"

Because 0 means end of string. Without 0 in the end any string function may fail continuing to read memory block.
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