WPF, C# , Open Printer Settings , does not work as expected

[naschd]

Hallo all ,

I am using code what I found because I have to implement functionality that at beginning of application , user sets printer settings and then just using visual. print

This is code which opens the dialog but does not keep the settings saved for next printing :
Next printing is done without printing dialog ...


[DllImport("winspool.Drv", EntryPoint = "DocumentPropertiesW", SetLastError = true,
ExactSpelling = true, CallingConvention = CallingConvention.StdCall)]
static extern int DocumentProperties(IntPtr hwnd, IntPtr hPrinter,
[MarshalAs(UnmanagedType.LPWStr)] string pDeviceName,
IntPtr pDevModeOutput, IntPtr pDevModeInput, int fMode);

[DllImport("winspool.drv")]
private static extern int OpenPrinter(string pPrinterName, out IntPtr hPrinter, IntPtr pDefault);
[DllImport("winspool.drv")]
private static extern int ClosePrinter(IntPtr phPrinter);

[DllImport("kernel32.dll")]
static extern IntPtr GlobalLock(IntPtr hMem);
[DllImport("kernel32.dll")]
static extern bool GlobalUnlock(IntPtr hMem);
[DllImport("kernel32.dll")]
static extern bool GlobalFree(IntPtr hMem);

private const int DM_PROMPT = 4;
private const int DM_OUT_BUFFER = 2;
private const int DM_IN_BUFFER = 8;


private void printDialog()
{
System.Windows.Controls.PrintDialog pDialog = new System.Windows.Controls.PrintDialog();
pDialog.PageRangeSelection = PageRangeSelection.AllPages;
pDialog.UserPageRangeEnabled = true;
string name = printerAvailable.SelectedValue.ToString();

PrintTicketConverter ptc = new PrintTicketConverter(name.ToString(), pDialog.PrintQueue.ClientPrintSchemaVersion);
IntPtr mainWindowPtr = new WindowInteropHelper(this).Handle;
byte[] myDevMode = ptc.ConvertPrintTicketToDevMode(pDialog.PrintQueue.DefaultPrintTicket, BaseDevModeType.UserDefault);
GCHandle pinnedDevMode = GCHandle.Alloc(myDevMode, GCHandleType.Pinned);
IntPtr pDevMode = pinnedDevMode.AddrOfPinnedObject();

DocumentProperties(mainWindowPtr, IntPtr.Zero, name.ToString(), pDevMode, pDevMode, 14);
pDialog.PrintQueue.DefaultPrintTicket = ptc.ConvertDevModeToPrintTicket(myDevMode);
pinnedDevMode.Free();


}
And printing apporach:


if (main_ViewModel.SelectedImageStr != string.Empty)
{
PrintingCustomDialog_View pcd = new PrintingCustomDialog_View();
pcd.Closing += Pcd_Closing;
var res = pcd.ShowDialog();
/// not needed double cmToUnits = 100 / 2.54;
if (res == true)
{
///can get out this cond.
if (main_ViewModel.SelectedImageStr != string.Empty)
{
var bi = new BitmapImage();
bi.BeginInit();
bi.CacheOption = BitmapCacheOption.OnLoad;
bi.UriSource = new Uri(main_ViewModel.SelectedImageStr);

bi.EndInit();

var vis = new DrawingVisual();
using (var dc = vis.RenderOpen())
{
dc.DrawImage(bi, new Rect { Width = bi.Width, Height = bi.Height });
}

var dlg = new System.Windows.Controls.PrintDialog();
//dlg.PrintQueue = "abc" ; // this will be your printer. any of these: new PrintServer().GetPrintQueues()
dlg.PrintTicket.CopyCount = TempCopies;
//dlg.ShowDialog();

dlg.PrintVisual(vis, Properties.Settings.Default.SelectedPrinter);
}
}

else
{

}
}





I find a variations of solutions with similar code but different settings but none of them worked ...
For instance , one person has different DocumentProperties parameters , another one suggest last parameter fMode to zero (I found 14 in it and I have absolutely no idea what does it mean)

Also In one forum I found this line with dm promt, buffer ... I change that but with no success.

Can I please ask for short or longer explanation ? not to some another forums but someting else. I would like to understand it quite more ...

Also I would like to ask , if someone can test my code or suggest (test first) changes , it would be also helpful for other people searching this....

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