i want to set paper size on printer preferences UI iam getting error response = -2147024809

narsi.rao16

hi All,

void CMFCApplication2Dlg::TestFinal()
{
// --- A. Define Printer Name and Paper Size ---
CString strPrinterName = _T("Microsoft Print to PDF");
const WORD nPaperEnumA4 = 9; // DMPAPER_A4

CPrintDialogEx dlg;

// --- B. Get hDevNames for the Selected Printer using the Helper ---
HGLOBAL hDevNames = GetDevNamesForPrinter(strPrinterName); // Assumes this helper is correct

if (hDevNames == NULL)
{
	AfxMessageBox(_T("Failed to get hDevNames for the printer."));
	return;
}

// --- C. Get and Modify the DEVMODE for the Printer (A4 Enforcement) ---
HGLOBAL hDevMode = NULL;
DEVMODE* pDevMode = NULL;

// 1. Get required size
long lSize = ::DocumentProperties(NULL, NULL, strPrinterName.GetBuffer(), NULL, NULL, 0);

if (lSize > 0)
{
	// 2. Allocate and lock DEVMODE
	hDevMode = ::GlobalAlloc(GHND, lSize);
	if (hDevMode)
	{
		pDevMode = (DEVMODE*)::GlobalLock(hDevMode);
		// 3. Populate
		::DocumentProperties(NULL, NULL, strPrinterName.GetBuffer(), pDevMode, NULL, DM_OUT_BUFFER);

		// 4. Force A4
		pDevMode->dmFields |= DM_PAPERSIZE;
		pDevMode->dmPaperSize = nPaperEnumA4;

		// 5. Re-validate
		::DocumentProperties(NULL, NULL, strPrinterName.GetBuffer(), pDevMode, pDevMode, DM_IN_BUFFER | DM_OUT_BUFFER);

		::GlobalUnlock(hDevMode);
	}
}

// --- D. Pass Handles and Show Dialog ---
if (hDevMode)
{
	dlg.m_pdex.lStructSize = sizeof(PRINTDLGEX);

	// *** CRITICAL FIX 1: RESTORE hDevNames ASSIGNMENT ***
	dlg.m_pdex.hDevMode = hDevMode;
	dlg.m_pdex.hDevNames = hDevNames;


	// Set flags to tell the dialog to return a DC, use the handles provided, 
	// and use the copies and collate settings from the DEVMODE.
	dlg.m_pdex.Flags = PD_RETURNDC | PD_USEDEVMODECOPIESANDCOLLATE;

	// *** CRITICAL FIX 2: RESTORE PAGE RANGE (use a non-restrictive range) ***
	dlg.m_pdex.nMinPage = 1;
	dlg.m_pdex.nMaxPage = 9999;

	// --- FIX: Removed the first redundant DoModal() call. ---
	// dlg.DoModal();

	INT_PTR response = dlg.DoModal(); // <-- Single, correct call to show the dialog

	if (response == S_OK) // S_OK is returned on success for PrintDlgEx
	{
		AfxMessageBox(_T("Print Confirmed."));
		// If successful, the returned hDevMode and hDevNames in m_pdex 
		// contain the final settings selected by the user.
	}
}

// --- E. Cleanup ---
// The framework or the subsequent printing code must take responsibility for
// freeing the handles returned in dlg.m_pdex.hDevMode and hDevNames.
// If DoModal failed, we free the handles we allocated.
// NOTE: This cleanup logic needs to be safe against double-free if DoModal succeeded
// and transferred ownership. For a test, this simple cleanup is acceptable.
if (hDevMode) ::GlobalFree(hDevMode);
if (hDevNames) ::GlobalFree(hDevNames);

}

please help me on this i tried different ways but not setting on UI printer preferences dialog its always showing letter.