Version 2.10e creates blank PDF's

[tpohlman]

We sometimes create several PDF's with one print call. With Version 2.10 the first PDF doc is fine but all additional documents are blank.

Our code basically

LPCTSTR szPrinter = "LL PDF Generator";
m_DC.CreateDC("WINSPOOL", szPrinter, NULL, NULL);
EnablePrinter

DOCINFO di;
::ZeroMemory (&di, sizeof (DOCINFO));
di.cbSize = sizeof (DOCINFO);
di.lpszDocName = "Winflex Doc";
di.lpszOutput = file(n).pdf

m_PrintingOK = m_DC.StartDoc(&di);
m_DC.StartPage();
// printing

m_DC.EndPage();
...
m_DC.EndDoc();

HDC createdDC = m_DC.Detach(); // detach the printer DC}
DeleteDC(createdDC);
m_DC.DeleteDC();


Then I basically do the exact same thing with a different filename
(ie file1.pdf file2.pdf ...)


This code worked fine in version 2.04 and earlier.

[Jose]

Hello,

The situation you are encountering typically happens when the EnablePrinter() function is not called each time output is sent to the PDF Converter.

In the code snippet you sent, I do not see where that function is used.

Thanks

[tpohlman]

I call enable printer right after I create the DC. line 3 in the snippet.

(I also call enableprinter when I init the code which happens before this)

Thanks.

[tpohlman]

I've also called activate right before I called createDC, didn't seem to make a difference. I also tried calling activate on each print page, also didn't make a difference.

Thanks.

Troy

[Jose]

Hello Troy,

Attached is a snippet of code that is very similar to what you are doing. Hope this helps.

void CPDFsampleView::OnPdfPrint()
{
// TODO: Add your command handler code here
HFONT font, oldFont;
HDC dc;
DOCINFO di;

// create a printer device context
dc = CreateDC( "winspool", theApp.m_szPrinter, NULL, NULL );
if ( NULL == dc )
{
ASSERT( FALSE );
return;
}

// init the DOCINFO structure, set the output file name
memset( &di, 0, sizeof(di) );
di.cbSize = sizeof( di );
di.lpszDocName = "Test document";

//using the DOCINFO filename
di.lpszOutput = "c:\\test.pdf";

theApp.m_icd.SetDefaultPrinter();
theApp.m_icd.SetFileNameOptionsEx (0x8000001);

// activate printer before starting to print
theApp.m_icd.EnablePrinter("Evaluation Version Developer", "07EFCDAB01000100584F8296EDE2DB671EE2564605C79BD0F9AEB6BDBA542926639B79ECC556F310DB8592F1C68BF146A4D4E86EB8C0E7824CE83E1E8DC2244454F2F7CA64FC6CF3CC82B6221CF4FDE37CB45301E0EF96E5D0200FD36A0E276889666828B1AACE0364E11C1C5632F9E2B4" );

// start printing
StartDoc( dc, &di );
StartPage( dc );
MoveToEx( dc, 100, 100, NULL );
LineTo( dc, 400, 100 );
MoveToEx( dc, 100, 100, NULL );
LineTo( dc, 100, 400 );

font = CreateFont( -24, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, _T("Verdana") );
oldFont = (HFONT)SelectObject( dc, font );
TextOut( dc, 100, 100, _T("Hi There"), 8 );
if ( oldFont ) SelectObject( dc, oldFont );
DeleteObject( font );

font = CreateFont( -24, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, _T("Wingdings") );
oldFont = (HFONT)SelectObject( dc, font );
TextOut( dc, 100, 200, _T("Hi There"), 8 );
if ( oldFont ) SelectObject( dc, oldFont );
DeleteObject( font );

EndPage( dc );
EndDoc( dc );

DeleteDC( dc );
// printing ended, no need to disactivate printer
// the printer will be disactivated automatically

}

[tpohlman]

After some more research I found out it wasn't in the creating of the pdf files at all. They are going blank when I'm adding the encryption.

when I create the pdf files I create an array of strings of all the pdf file I've created.

Now here is my code for adding encryption. (normally I save to the same file but when I wrote to a different file the originals are fine but the 2-nth encrypted file are blank - the first encrypted file is fine too.)

IDIDocument amyuni;
CoInitialize(NULL);
COleException oe;
bool dispOK = amyuni.CreateDispatch("CDIntfEx.Document",&oe);
if (dispOK)
{
try
{
for (int i=0; i < m_PDFFiles.GetSize(); i++)
{
amyuni.Open(m_PDFFiles.GetAt(i));
amyuni.SetLicenseKey(company, key);
amyuni.Encrypt("password", "", -64+4);
amyuni.Save("c:\\pdftest\\encrypted" + LConvertType::toString(i) + ".pdf");
}
}
catch(CException* e)
{
char message[1024];
e->GetErrorMessage(message, sizeof(message)-1);
MessageBox(0, message, "Error while Creating PDF", MB_OK|MB_ICONEXCLAMATION);
e->Delete();
}
}
else
{
char tmp[1024];
oe.GetErrorMessage(tmp, 1023);
MessageBox(0, "Cannot create dispatch!!!\n" + tmp, "test", MB_OK);
}

[tpohlman]

I moved the creation of the IDIDocument inside of the loop. And now it works!!! I'm just wondering why this doesn't work the other way? Creating the IDIDocument for every file seems very inefficient. Please let me know if there is any way I can do this better?

Thanks

Troy