I want to print data in text file out to the paper If my data in text file is 110011110 I want to change 1 in the above data to solid black (which have 2 pixel width and 4 pixel height) and 0 in the above data to solid white (which have 2 pixel width and 4 pixel height) This below is code but it does not work. The printer do not print anything.What wrong with my code? void CTestprint::OnPrintButton() { DOCINFO di ; CPrintInfo printInfo ; CDC dc ; CRect draw_area ; CPrintDialog dlg(FALSE) ; if (dlg.DoModal() == IDCANCEL) return ; HDC hDC = dlg.GetPrinterDC() ; if (hDC == NULL) return ; di.cbSize = sizeof(DOCINFO) ; di.lpszDocName = "Document name"; di.lpszOutput = NULL ; // prepare the print information structure dc.Attach(hDC) ; printInfo.m_bDirect = TRUE ; printInfo.m_rectDraw.left = 0 ; printInfo.m_rectDraw.right = dc.GetDeviceCaps(HORZRES) ; printInfo.m_rectDraw.top = 0 ; printInfo.m_rectDraw.bottom = dc.GetDeviceCaps(VERTRES) ; draw_area = printInfo.m_rectDraw ; dc.StartDoc(&di) ; CString testline = "101101001" ; int x = 0 ; int y = 0 ; int pos = 0 ; // start printing the document dc.StartPage() ; while (pos < testline.GetLength()) { if ((testline.GetAt(pos)) == 1) { CBrush brush; // Creation of the brush with a black color brush.CreateSolidBrush(RGB(0, 0, 0)); // Create a rectangle with coordinates x,y,x+2,y+4 corresponding with top, left, bottom, right CRect Rectangle(x, y, x + 2, y + 4) ; // Fill a rectangle in the current device context or DC dc.FillRect(&Rectangle , &brush); x += 2; } // fall through to '0' which just moves the position else if ((testline.GetAt(pos)) == 0){ x += 2 ; } pos++ ; } y += 4 ; x = 0 ; pos = 0 ; dc.EndPage() ; printInfo.m_rectDraw = draw_area ; dc.EndDoc() ; VERIFY(dc.DeleteDC()) ; }

I haven't gone through this thoroughly, but you are comparing the characters '0' and '1' to the integers 0 and 1, after calling testline.GetAt(pos). It's a common mishap, because characters are integers too, so no error occurs. Post back if that doesn't resolve it. Cheers