Urgent !!! : how to read a text file in vc++

[Guest_imported]

how to read a text file in vc++.

Thanks

 

[SteveD73]

Hi

You can read a file in C++ in many ways. One of the ways I use is as follows (this also works in C).

FILE *fPtr;

fPtr.fopen("filename", "r"
.
.
fPtr.close();

To access the data in the file you can use:

char c = fgetc(fPtr); // gets a byte at a time

or

fread(...); // reads into a buffer setup by you

If you need any extra info just reply to this.

Good luck

 

[TGM]

Hi

You can use MFC base class to do it:

CString strContent = "";
CFile fRec;
CFileException e;
CString strUnit;

if ( !fRec.Open( strFile, CFile::modeRead | CFile::shareDenyNone, &e))
{
CString strMsg;

strMsg.Format( "Unable to Open File %s: error %d", strFile, e.m_cause);

AfxMessageBox( strMsg);

return .... what you want .. FALSE, ...
}

int nLength = ( int) fRec.GetLength();

// Allocate Memory to Read File

char* pszBuffer = new char [nLength + 1];

if ( pszBuffer == ( char*) NULL)
{
fRec.Close();

AfxMessageBox( "Memory Allocation Error !!! Unable to Read ..."

return .... what you want .. FALSE, ...
}

// Read File

fRec.Read( pszBuffer, nLength);

// Clean Up

fRec.Close();

You can store it in a CString

strContent = CString( pszBuffer, nLength);

Do not Forget to Clean up memory ...

// Free Memory

delete [] pszBuffer;

HTH

Thierry
EMail: Thierry.Marneffe@swing.be

 

[Cagliostro]

You can also use STL:
#include<fstream>
int main()
{
ifstream oneFile(&quot;OneFile.txt&quot;
go on;
return 0;
} John Fill

ivfmd@mail.md

 

[Cagliostro]

You can also use STL:
#include<fstream>
using namespace std;
int main()
{
ifstream oneFile(&quot;OneFile.txt&quot;
go on;
return 0;
} John Fill

ivfmd@mail.md

 

[pipk]

If you want to read it in char by char then use the get() method.
or line by line with getline()

 

[wduty]

You can also use plain win32 calls. For example, this will read in a file &quot;C:\test.txt&quot; and display it in a message box:

#include <windows.h>

int main()
{
DWORD dwSize, dwBytesRead;
HANDLE hFile = CreateFile(&quot;c:\\test.txt&quot;, GENERIC_READ, FILE_SHARE_READ, NULL,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (hFile != INVALID_HANDLE_VALUE)
{
dwSize = GetFileSize(hFile, NULL);
char* pFileText = new char[dwSize + 1];
pFileText[dwSize] = 0;
if (ReadFile(hFile, pFileText, dwSize, &dwBytesRead, NULL))
MessageBox(0, pFileText, &quot;&quot;, 0);
delete pFileText;
}
CloseHandle(hFile);
return 0;
}
--Will Duty
wduty@radicalfringe.com