Need help with Printer code

I'm trying to write a printer code in C for a simple Windows multiline edit control application (like Notepad for example). What the code show below currently does is print multiple lines of text from the edit control within the pre-determined margins. What it does NOT do is wrap lines of text (horizontally) that are longer than space allocated within the margins. For example: if the space between the margins will hold only 50 characters horizontally, and the current string has 60 characters; the printer will not print the additional 10 characters to the next line. So, I would guess that I need some kinda loop that makes sure that all the characters on a line are printed.....And I don't have a clue as to how to accomplish this. Any help is welcome.

BTW, variables and such not show in the code are declared globally.

Code:

---

int APIENTRY Print (
    HWND    hWnd)
{
    HDC    hdc;                  // printer DC
    char    sz[32];
    int    cch;
    int    nChars;              // number of chars in line
    WORD    Offset;              // line offset into MLE buffer
    PSTR    pch;                  // current line
    PSTR    pchEOL;              // pointer to end of string from MLE
    PSTR    pNextLine;            // next bit of line to try printing; leftovers
    WORD    LineNum;              // current line number
    WORD    wpNumLines;          // number of lines to print
    HANDLE  hEditData;            // handle to MLE text
    DWORD  dy;
    int    yCurpos;              // current y-position rel. to top margin
    int    xCurpos;              // current x-position rel. to left margin
    int    nPixelsLeft;          // number of pixels left to print in
    int    nLinesPerPage;        // not inc. header and footer
    int    guess;                // number of chars that can print
    int    nPrintedLines;
    static const char letter[] = " ";
    WORD    fError = TRUE;
    HWND    hWndEdit = (HWND)GetWindowLong(hWnd, WL_HWNDEDIT);
    LPSTR  lpEditData;
    LONG    wLength;
    TEXTMETRIC Metrics;
    SIZE    sSize;
    fAbort = FALSE;


    // Create the job title by loading the title string from STRINGTABLE
    cch = LoadString ((HANDLE)GetModuleHandle (NULL), IDS_PRINTJOB, sz, sizeof(sz));
    szTitle = sz + cch;
    cch += GetWindowText (hWnd, sz + cch, 32 - cch);
    sz[31] = 0;

    // Initialize the printer
    hdc = GetPrinterDC();
    if (!hdc)
      AlertBox (hWnd, MB_OK | MB_ICONHAND,
                IDS_PRINTERROR,
                lpszYyz);

    // Width of the display, in pixels
    xPrintRes = GetDeviceCaps (hdc, HORZRES);

    // Height of the display, in raster lines
    yPrintRes = GetDeviceCaps (hdc, VERTRES);

    // pixels per inch for 1 inch margins
    xPixInch = 1 * GetDeviceCaps (hdc, LOGPIXELSX);
    yPixInch = 1 * GetDeviceCaps (hdc, LOGPIXELSY);

    // Offset of the printable area from top hand corner, in device units
    xPhysOff  = GetDeviceCaps (hdc, PHYSICALOFFSETX);
    yPhysOff  = GetDeviceCaps (hdc, PHYSICALOFFSETY);

    // compute margins in pixels
    dxLeft  = (xPixInch - xPhysOff);
    dxRight = (xPixInch - xPhysOff);
    dyTop  = (yPixInch  - yPhysOff);
    dyBottom = (yPixInch - yPhysOff);

    SetBkMode( hdc, TRANSPARENT );

    // Calculate necessary metrics for file
    GetTextMetrics (hdc, &Metrics);
    yPrintChar = Metrics.tmHeight + Metrics.tmExternalLeading ;

    tabSize = Metrics.tmAveCharWidth * 8; /* 8 ave char width pixels for tabs */

    // Number of lines on a page with margins
    nLinesPerPage = ((yPrintRes - dyTop - dyBottom) / yPrintChar);

    // Disable the main application window and create the Cancel dialog
    EnableWindow (hWnd, FALSE);
    hCancelDlg = CreateDialog ((HANDLE)GetModuleHandle (NULL),
                              IDD_CANCELDLG,
                              hWnd,
                              (DLGPROC) AbortDlgProc);
    if (!hCancelDlg)
        return IDS_CANCELDLGFAILED;

    // job started, so display cancel dialog
    ShowWindow (hCancelDlg, SW_SHOW);
    UpdateWindow (hCancelDlg);

    // set AbortProc callback
    SetAbortProc (hdc, AbortProc);
    if (!AbortProc)
        {
        // on error, clean up and go away
        DestroyWindow (hCancelDlg);
        DeleteDC (hdc);
        return IDS_SETABORTPROCFAILED;
        }

    // Initialize the document
    if (Escape (hdc, STARTDOC, cch, (LPSTR)sz, NULL) < 0)
        {
        // on error, clean up and go away
        DestroyWindow (hCancelDlg);
        DeleteDC (hdc);
        return IDS_STARTDOCFAILED;
        }

    // Get the height of one line and the height of a page
    {
    SIZE sLine;
    GetTextExtentPoint (hdc, letter, 1, &sLine);
    dy = sLine.cy;
    }

    // Get the lines in document and a handle to the text buffer
    LineNum          = 0;
    yCurpos          = 0;
    xCurpos          = 0;
    nPrintedLines = 0;
    wpNumLines = (WORD)SendMessage (hWndEdit, EM_GETLINECOUNT, 0, 0L);
    hEditData = (HANDLE)SendMessage (hWndEdit, EM_GETHANDLE, 0, 0L);

    // length in bytes of edit control text
    wLength = SendMessage (hWndEdit, WM_GETTEXTLENGTH, 0, 0L);

    hEditData = LocalAlloc (LHND, wLength+1);
    lpEditData = (LPSTR)LocalLock (hEditData);
    GetWindowText (hWndEdit, lpEditData, wLength+1);

    // Print text line by line from top to bottom
    while (LineNum < wpNumLines) {
        // If at end of page, start a new page
        if (yCurpos + (int)dy > yPrintRes) {
            // Reached the end of a page. Tell the device driver to eject a
            // page
            //
            if (Escape (hdc, NEWFRAME, 0, NULL, NULL) < 0 || fAbort) {
                DestroyWindow (hCancelDlg);
                LocalUnlock (hEditData);
                LocalFree (hEditData);
                DeleteDC (hdc);
                return IDS_PRINTABORTED;
            }
            yCurpos = 0;
        }

        // Get the length and position of the line in the buffer
        // and lock from that offset into the buffer
        Offset = (WORD)SendMessage (hWndEdit, EM_LINEINDEX, LineNum, 0L);
        nChars = (WORD)SendMessage (hWndEdit, EM_LINELENGTH, Offset, 0L);
        pch = (PSTR)LocalLock(hEditData) + Offset;
        pchEOL = ((PSTR)LocalLock(hEditData) + Offset) + nChars;

      // find what to print - up to EOL
      pNextLine = pch;    // find end of line
      while (pNextLine != pchEOL)
      pNextLine++;

      // find out how many characters will fit on line
      nPixelsLeft = xPrintRes - dxRight - dxLeft - xCurpos;
      GetTextExtentExPoint( hdc, pch, pNextLine-pch,
                      nPixelsLeft, &guess, NULL, &sSize );

      if (guess) {
          // Print the current line and unlock the text handle
        TabbedTextOut (hdc, dxLeft+xCurpos, yCurpos+dyTop, (LPSTR)pch, guess,
                        0, NULL, dxLeft+xCurpos);
        LocalUnlock (hEditData);
      }

        // Test and see if the Abort flag has been set. If yes, exit.
        if (fAbort)
            goto getout2;

        // Move down the page
        yCurpos += dy;
        LineNum++;
        nPrintedLines++;
        xCurpos = 0;
    }  // end of while (LineNum < wpNumLines) loop

    // Eject the last page.
    if (Escape (hdc, NEWFRAME, 0, NULL, NULL) < 0)
        goto getout2;

    // Complete the document.
    if (Escape (hdc, ENDDOC, 0, NULL, NULL) < 0) {
getout2:
        // Ran into a problem before NEWFRAME? Abort the document
      Escape (hdc, ABORTDOC, 0, NULL, NULL);
    }
    else
        fError=FALSE;

    // Error? make sure the user knows...
    if (fError)
      AlertBox (hWnd, MB_OK | MB_ICONEXCLAMATION, IDS_PRINTERROR, (LPSTR)szTitle);

    // end cancel dialog box, clean up, re-enable main app. window and exit
    DestroyWindow (hCancelDlg);
    DeleteDC(hdc);
    LocalUnlock (hEditData);
    LocalFree (hEditData);
    EnableWindow (hWnd, TRUE);
    return TRUE;
}

---

So I don't feel like looking things up right this minute: GetTextExtentExPoint tells you where to stop printing, right? Why not check to see if that's in the middle of the line?

Since this thread has had a fair amount of reviews I figured I post my somewhat "fix" for the problem I had. Remember, I'm a novice when it comes to programming.

Code:

---

int APIENTRY Print (
    HWND    hWnd)
{
    HDC    hdc;                  // printer DC
    char    sz[32];
    int    cch;
    int    nChars;              // number of chars in line
    WORD    Offset;              // line offset into MLE buffer
    PSTR    pch;                  // current line
    PSTR    pchEOL;              // pointer to end of string from MLE
    PSTR    pNextLine;            // next bit of line to try printing; leftovers
    WORD    LineNum;              // current line number
    WORD    wpNumLines;          // number of lines to print
    HANDLE  hEditData;            // handle to MLE text HGLOBAL
    DWORD  dy;
    int    yCurpos;              // current y-position rel. to top margin
    int    xCurpos;              // current x-position rel. to left margin
    int    nPixelsLeft;          // number of pixels left to print in
    int    nLinesPerPage;        // not inc. header and footer
    int    guess;                // number of chars that can print
    int    nPrintedLines;
    double  xDl;                  // stuff for calculating margins
    double  xDr;                  //            "
    double  yDt;                  //            "
    double  yDb;                  //            "
    double  xLpix;                //            "
    double  xRpix;                //            "
    double  yTpix;                //            "
    double  yBpix;                //            "
    char    *stopstring;          //            "
    int    count;                // counter for strings larger than margins
    static const char letter[] = " ";
    WORD    fError = TRUE;
    HWND    hWndEdit = (HWND)GetWindowLong(hWnd, WL_HWNDEDIT);
    LPSTR  lpEditData;
    LONG    wLength;  // WPARAM
    TEXTMETRIC Metrics;
    SIZE    sSize;
    fAbort = FALSE;


    // Create the job title by loading the title string from STRINGTABLE
    cch = LoadString ((HANDLE)GetModuleHandle (NULL), IDS_PRINTJOB, sz, sizeof(sz));
    szTitle = sz + cch;
    cch += GetWindowText (hWnd, sz + cch, 32 - cch);
    sz[31] = 0;

    // Initialize the printer
    hdc = GetPrinterDC();
    if (!hdc)
      AlertBox (hWnd, MB_OK | MB_ICONHAND,
                IDS_PRINTERROR,
                lpszYyz);

    // Retrieve margin strings from pagesetup dialog and convert to double
    xDl = strtod (szLft, &stopstring); // convert char string to double
    xDr = strtod (szRt, &stopstring);
    yDt = strtod (szTop, &stopstring);
    yDb = strtod (szBtm, &stopstring);

    // Width of the display, in pixels
    xPrintRes = GetDeviceCaps (hdc, HORZRES);

    // Height of the display, in raster lines
    yPrintRes = GetDeviceCaps (hdc, VERTRES);

    // Pixels per inch for margins
    xLpix = xDl * GetDeviceCaps (hdc, LOGPIXELSX);
    xRpix = xDr * GetDeviceCaps (hdc, LOGPIXELSX);
    yTpix = yDt * GetDeviceCaps (hdc, LOGPIXELSY);
    yBpix = yDb * GetDeviceCaps (hdc, LOGPIXELSY);

    // Round off double so we can store as integer
    lMargin = (int)floor(xLpix + 0.5);
    rMargin = (int)floor(xRpix + 0.5);
    tMargin = (int)floor(yTpix + 0.5);
    bMargin = (int)floor(yBpix + 0.5);

    // Offset of the printable area from top hand corner, in device units
    xPhysOff  = GetDeviceCaps (hdc, PHYSICALOFFSETX);
    yPhysOff  = GetDeviceCaps (hdc, PHYSICALOFFSETY);

    // Error handling for margins just in
    // case someone inputs an invalid character
    if (lMargin <= xPhysOff)
      lMargin = xPhysOff * 2;
    if (rMargin <= xPhysOff)
      rMargin = xPhysOff * 2;
    if (tMargin <= yPhysOff)
      tMargin = yPhysOff * 2;
    if (bMargin <= yPhysOff)
      bMargin = yPhysOff * 2;

    // compute margins in pixels
    dxLeft  = (lMargin - xPhysOff);
    dxRight = (rMargin - xPhysOff);
    dyTop  = (tMargin  - yPhysOff);
    dyBottom = (bMargin - yPhysOff);

    SetBkMode (hdc, TRANSPARENT);

    // Calculate necessary metrics for file
    GetTextMetrics (hdc, &Metrics);
    yPrintChar = Metrics.tmHeight + Metrics.tmExternalLeading ;  // the height

    tabSize = Metrics.tmAveCharWidth * 8;  // 8 ave char width pixels for tabs

    // Number of lines on a page with margins
    nLinesPerPage = ((yPrintRes - dyTop - dyBottom) / yPrintChar);

    // Disable the main application window and create the Cancel dialog
    EnableWindow (hWnd, FALSE);
    hCancelDlg = CreateDialog ((HANDLE)GetModuleHandle (NULL),
                              IDD_CANCELDLG,
                              hWnd,
                              (DLGPROC) AbortDlgProc);
    if (!hCancelDlg)
        return IDS_CANCELDLGFAILED;

    // job started, so display cancel dialog
    ShowWindow (hCancelDlg, SW_SHOW);
    UpdateWindow (hCancelDlg);

    // set AbortProc callback
    SetAbortProc (hdc, AbortProc);
    if (!AbortProc)
        {
        // on error, clean up and go away
        DestroyWindow (hCancelDlg);
        DeleteDC (hdc);
        return IDS_SETABORTPROCFAILED;
        }

    // Initialize the document
    if (Escape (hdc, STARTDOC, cch, (LPSTR)sz, NULL) < 0)
        {
        // on error, clean up and go away
        DestroyWindow (hCancelDlg);
        DeleteDC (hdc);
        return IDS_STARTDOCFAILED;
        }

    // Get the height of one line and the height of a page
    {
    SIZE sLine;
    GetTextExtentPoint (hdc, letter, 1, &sLine);
    dy = sLine.cy;
    }

    // Get the lines in document and a handle to the text buffer
    LineNum  = 0;
    yCurpos          = 0;
    xCurpos          = 0;
    nPrintedLines = 0;
    wpNumLines = (WORD)SendMessage (hWndEdit, EM_GETLINECOUNT, 0, 0L);

    // length in bytes of edit control text
    wLength = SendMessage (hWndEdit, WM_GETTEXTLENGTH, 0, 0L);
    wLength++;
    hEditData = (HANDLE)LocalAlloc (LHND, (DWORD)wLength);
    lpEditData = (LPSTR)LocalLock (hEditData);
    SendMessage (hWndEdit, WM_GETTEXT, wLength, (LPARAM)lpEditData);

    // Print text line by line from top to bottom
    while (LineNum < wpNumLines) {
      count = 0;  // reset counter for textout handling strings larger than margins
      // If at end of page, start a new page
      if (yCurpos + (int)dy > (yPrintRes - dyTop - dyBottom)) {
          // Reached the end of a page. Tell the device driver to eject a
          // page
          //
          if (Escape (hdc, NEWFRAME, 0, NULL, NULL) < 0 || fAbort)
            {
            DestroyWindow (hCancelDlg);
            LocalUnlock (hEditData);
            LocalFree (hEditData);
            DeleteDC (hdc);
            return IDS_PRINTABORTED;
            }
          yCurpos = 0;
          nPrintedLines = 0;  // reset lines printed
      }

      // Print out header if we are about to print
      // the first line on the page
      if (nPrintedLines == 0) {
        // print header if one exists
        yCurpos = 0;
        if (PrintHeader(hdc))
            yCurpos = 0;
            xCurpos = 0;
      }

      // Get the length and position of the line in the buffer
      // and lock from that offset into the buffer
      Offset = (WORD)SendMessage (hWndEdit, EM_LINEINDEX, LineNum, 0L);
      nChars = (WORD)SendMessage (hWndEdit, EM_LINELENGTH, Offset, 0L);  // length in bytes=chars
      pch = (PSTR)LocalLock(hEditData) + Offset;
      pchEOL = ((PSTR)LocalLock(hEditData) + Offset) + nChars;

      // find what to print - up to EOL
      pNextLine = pch;    // find end of line
      while (pNextLine != pchEOL)
      pNextLine++;  // increment till EOL

      // find out how many characters will fit on line
      nPixelsLeft = xPrintRes - dxRight - dxLeft - xCurpos;  // in logical units
      GetTextExtentExPoint (hdc, pch, pNextLine-pch,
                      nPixelsLeft, &guess, NULL, &sSize);

      do {
        if (nChars > guess) {
            // Print the current line and unlock the text handle
            TabbedTextOut (hdc, dxLeft+xCurpos, yCurpos+dyTop, (LPSTR)pch, guess,
                          0, NULL, dxLeft+xCurpos);

            pch += guess;  // add quantity of guess to pch; limit set by nPixelsLeft
            nChars -= guess;  // how many chars left to print in current line
            yCurpos += dy;  // move down the page one line
            xCurpos = 0;  // reset x position to zero
            count++;      // increment by one every time string is larger than margins

        if (nChars <= guess) {
            guess = nChars;  // put remaining char count in guess

            // print remaining characters on next line
            TabbedTextOut (hdc, dxLeft+xCurpos, yCurpos+dyTop, (LPSTR)pch, guess,
                          0, NULL, dxLeft+xCurpos);

            pch  += guess;
            nChars -= guess;

            // since string was larger than the margin
            // calculate the x starting point for the
            // next string on this current line
            xCurpos += (sSize.cx - nPixelsLeft*count);  // account for printing

            LineNum++;  // increment line count by one here since
                        // string was larger than horizontal margin
        }

        }
        else {
            // If string is smaller or equal to nPixelsLeft
            TabbedTextOut (hdc, dxLeft+xCurpos, yCurpos+dyTop, (LPSTR)pch, guess,
                          0, NULL, dxLeft+xCurpos);
            xCurpos = 0;    // reset x position to zero
            yCurpos += dy;  // move down the page one line
            LineNum++;      // increment line count by one
        }

        LocalUnlock (hEditData);

        // Test and see if the Abort flag has been set. If yes, exit.
        if (fAbort)
          goto getout2;

        // Increment line count and line printed
        nPrintedLines++;  // increment lines printed by one

        // If remaining chars is still larger than margins
        if (nChars > guess)
          guess = guess;

      } while (guess < nChars);  // end while/do loop

    }  // end of while (LineNum < wpNumLines) loop

    // Eject the last page.
    if (Escape (hdc, NEWFRAME, 0, NULL, NULL) < 0)
        goto getout2;

    // Complete the document.
    if (Escape (hdc, ENDDOC, 0, NULL, NULL) < 0) {
getout2:
        // Ran into a problem before NEWFRAME? Abort the document
      Escape (hdc, ABORTDOC, 0, NULL, NULL);
    }
    else
        fError=FALSE;

    // Error? make sure the user knows...
    if (fError)
      AlertBox (hWnd, MB_OK | MB_ICONEXCLAMATION, IDS_PRINTERROR, (LPSTR)szTitle);

    // end cancel dialog box, clean up, re-enable main app. window and exit
    DestroyWindow (hCancelDlg);
    DeleteDC(hdc);
    LocalUnlock (hEditData);
    LocalFree (hEditData);
    EnableWindow (hWnd, TRUE);
    return TRUE;
}

---

In addition, I posted this code just in case some of the people who viewed this post where looking for answers to there own printer code problems in C.
BTW, I'm still open to suggestions regarding my original problem even though I created that somewhat terrible looking fix.