Read & display file in vc++ mfc

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5.00/5 (1 vote)

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VC6

C++

How to read and display .txt file on client area in vc++ mfc?

Posted 28-Mar-11 17:56pm

virus131

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Albert Holguin 29-Mar-11 0:08am

this question is pretty simple... not going to try google first?

3 solutions

Solution 3

My solution from me:
{
long lSize;
char * buffer;
size_t result;

pFile = fopen ( "C:\\examan.txt" , "rb" );
if (pFile==NULL) {fputs ("File error",stderr); exit (1);}

// obtain file size:
fseek (pFile , 0 , SEEK_END);
lSize = ftell (pFile);
rewind (pFile);

// allocate memory to contain the whole file:
buffer = (char*) malloc (sizeof(char)*lSize);
if (buffer == NULL) {fputs ("Memory error",stderr); exit (2);}

// copy the file into the buffer:
result = fread (buffer,1,lSize,pFile);
if (result != lSize) {fputs ("Reading error",stderr); exit (3);}

/* the whole file is now loaded in the memory buffer. */
UpdateData(true);
Edit1=buffer;
UpdateData(false);
// terminate
fclose (pFile);
free (buffer);
}

Posted 12-Mar-12 17:12pm

ve2vdi

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hansen303 · Accepted Answer · 2011-03-28T19:20:00

Hello,
First, you need to read the text from the file. One way to do this would be to use the CFile class to open and read the file data.

CFile file;
CFileException ex;
CString fileText;
// open the source file for reading
if (!file.Open(_T("Hello.txt"),
    CFile::modeRead | CFile::shareDenyWrite, &ex))
{
  // complain if an error happened
  // no need to delete the ex object
  TCHAR szError[1024];
  ex.GetErrorMessage(szError, 1024);
  TRACE1("Couldn't open source file: %s\n", szError);
}
else
{
  UINT nBytes = (UINT)file.GetLength();
  int nChars = nBytes / sizeof(TCHAR);
  nBytes = file.Read(fileText.GetBuffer(nChars), nBytes);
  fileText.ReleaseBuffer(nChars);
}

Then you have a few options for displaying the text.
If you are working on a dialog app the easiest thing might be to add a static control to the dialog and just set the text for the window

C#

CWnd *pwndStatic = this->GetDlgItem(IDC_LABEL);
if (pwndStatic)
{
    pwndStatic->SetWindowText(m_fileText);
}

Or, if you are trying something more sophisticated you can override the OnPaint method for the window you want the text in and draw the text yourself:

CPaintDC dc(this);
CRect rect;
GetClientRect(&rect);
dc.DrawText(m_fileText, &rect, DT_LEFT | DT_NOCLIP);

Hope this helps!

Prerak Patel · Accepted Answer · 2011-03-28T18:34:00

Solution 1

Hints for you.
Use CFile, open .txt file in read mode, read the text using Read() and display where you want.

Posted 28-Mar-11 18:34pm

Prerak Patel

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Member 12374036 7-Mar-16 5:18am

How to diaplay in other controls