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Re: Direct printing to a specific printer [message #46434 is a reply to message #46416]

Wed, 11 May 2016 00:37

Lance
Messages: 527
Registered: March 2007

Contributor

You should have no problem doing that. Maybe not out of box.

Look into Upp code PrinterJob.cpp, in particular Execute0()

bool PrinterJob::Execute0(bool dodlg)
{
	pdlg = new Win32PrintDlg_;
	PRINTDLG& dlg = *pdlg;
	dlg.Flags = PD_DISABLEPRINTTOFILE|PD_NOSELECTION|PD_HIDEPRINTTOFILE|PD_RETURNDEFAULT;
	dlg.nFromPage = current;
	dlg.nToPage = current;
	dlg.nMinPage = from;
	dlg.nMaxPage = to;
	if(from != to)
		dlg.Flags |= PD_ALLPAGES;
	dlg.hwndOwner = 0;
	dlg.Flags |= PD_RETURNDEFAULT;
	dlg.nCopies = 1;
	if(!PrintDlg(&dlg)) return false;
	if(dlg.hDevMode) {
		DEVMODE *pDevMode = (DEVMODE*)::GlobalLock(dlg.hDevMode);
		pDevMode->dmOrientation = landscape ? DMORIENT_LANDSCAPE : DMORIENT_PORTRAIT;
		::GlobalUnlock(dlg.hDevMode);
	}
	HDC hdc;
	if(dodlg) {
		dlg.Flags = PD_DISABLEPRINTTOFILE|PD_NOSELECTION|PD_HIDEPRINTTOFILE|PD_RETURNDC|PD_USEDEVMODECOPIESANDCOLLATE;
		Vector< Ptr<Ctrl> > disabled = DisableCtrls(Ctrl::GetTopCtrls());
		bool b = PrintDlg(&dlg);
		EnableCtrls(disabled);
		if(!b) return false;
		hdc = dlg.hDC;
	}
	else {
		DEVNAMES *p = (DEVNAMES *)::GlobalLock(dlg.hDevNames);
		const char *driver = (const char *)p + p->wDriverOffset;
		const char *device = (const char *)p + p->wDeviceOffset;
		if(dlg.hDevMode) {
			DEVMODE *pDevMode = (DEVMODE*)::GlobalLock(dlg.hDevMode);
			hdc = CreateDC(driver, device, NULL, pDevMode);
			::GlobalUnlock(dlg.hDevMode);
		}
		else
			hdc = CreateDC(driver, device, NULL, NULL);
	}
	if(dlg.hDevMode)
		::GlobalFree(dlg.hDevMode);
	if(dlg.hDevNames)
		::GlobalFree(dlg.hDevNames);
	if(hdc) {
		draw = new PrintDraw(hdc, Nvl(name, Ctrl::GetAppName()));
		page.Clear();
		if(!(dlg.Flags & PD_PAGENUMS)) {
			dlg.nFromPage = dlg.nMinPage;
			dlg.nToPage = dlg.nMaxPage;
		}
		for(int i = dlg.nFromPage - 1; i <= dlg.nToPage - 1; i++)
			page.Add(i);
		return true;
	}
	return false;
}

Pay attention to this line:

	if(hdc) {
		draw = new PrintDraw(hdc, Nvl(name, Ctrl::GetAppName()));

That says with a standard win32 HDC, you can create a PrintDraw, which speaks U++. So your task is how to use win32 api to create a HDC with a given device (printer) name. The above listed Execute0 also gives you a lots of clue, some of the relevant code can be boiled down to

		DEVNAMES *p = (DEVNAMES *)::GlobalLock(dlg.hDevNames);
		const char *driver = (const char *)p + p->wDriverOffset;
		const char *device = (const char *)p + p->wDeviceOffset;
		hdc = CreateDC(driver, device, NULL, NULL);

now remaining question is what dlg.hDevNames is, how to map your printer name to that particular handle. This is probably a viable path. This is not the say that it's the smartest or shortest path. Check with somebody who is really familiar with Win32 programming.

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