About the ContentStream

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   Hi professional:
	I find that the below two pieces of code get the same results when I open the pdf file by the software of  AI. why?  I also get one layer, what is the function NewOptionalContentGroup means?
thank you.  look forward to your reply.

int OCG1 = DPL.NewOptionalContentGroup(L"group1");

DPL.SelectPage(1);
DPL.SetOrigin(1);

int cs1 = DPL.NewContentStream();
DPL.SelectContentStream(cs1);
DPL.DrawText(100,100,L"CS1");
DPL.SetContentStreamOptional(OCG1);
DPL.SetOptionalContentGroupVisible(OCG1, 1);

int OCG2 = DPL.NewOptionalContentGroup(L"group2");

int cs2 = DPL.NewContentStream();
DPL.SelectContentStream(cs2);
DPL.DrawText(100, 200, L"CS2");
DPL.SetContentStreamOptional(OCG2);
DPL.SetOptionalContentGroupVisible(OCG2, 1);

DPL.SaveToFile(L"newLayer.pdf");


////////////////////////////////////////////////////////////////////////////////
int OCG1 = DPL.NewOptionalContentGroup(L"group1");

DPL.SelectPage(1);
DPL.SetOrigin(1);

int cs1 = DPL.NewContentStream();
DPL.SelectContentStream(cs1);
DPL.DrawText(100,100,L"CS1");
DPL.SetContentStreamOptional(OCG1);
DPL.SetOptionalContentGroupVisible(OCG1, 1);


int cs2 = DPL.NewContentStream();
DPL.SelectContentStream(cs2);
DPL.DrawText(100, 200, L"CS2");
DPL.SetContentStreamOptional(OCG1);
DPL.SetOptionalContentGroupVisible(OCG1, 1);

DPL.SaveToFile(L"newLayer.pdf");

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nieguizhi Members Profile Find Members Posts Beginner Joined: 12 Jan 16 Location: shanghai Status: Offline Points: 12	Post Options Post Reply Quote nieguizhi Report Post Thanks(0) Quote Reply Topic: About the ContentStream Posted: 12 Jan 16 at 2:30AM
	Hi professional: I find that the below two pieces of code get the same results when I open the pdf file by the software of AI. why? I also get one layer, what is the function NewOptionalContentGroup means? thank you. look forward to your reply. int OCG1 = DPL.NewOptionalContentGroup(L"group1"); DPL.SelectPage(1); DPL.SetOrigin(1); int cs1 = DPL.NewContentStream(); DPL.SelectContentStream(cs1); DPL.DrawText(100,100,L"CS1"); DPL.SetContentStreamOptional(OCG1); DPL.SetOptionalContentGroupVisible(OCG1, 1); int OCG2 = DPL.NewOptionalContentGroup(L"group2"); int cs2 = DPL.NewContentStream(); DPL.SelectContentStream(cs2); DPL.DrawText(100, 200, L"CS2"); DPL.SetContentStreamOptional(OCG2); DPL.SetOptionalContentGroupVisible(OCG2, 1); DPL.SaveToFile(L"newLayer.pdf"); //////////////////////////////////////////////////////////////////////////////// int OCG1 = DPL.NewOptionalContentGroup(L"group1"); DPL.SelectPage(1); DPL.SetOrigin(1); int cs1 = DPL.NewContentStream(); DPL.SelectContentStream(cs1); DPL.DrawText(100,100,L"CS1"); DPL.SetContentStreamOptional(OCG1); DPL.SetOptionalContentGroupVisible(OCG1, 1); int cs2 = DPL.NewContentStream(); DPL.SelectContentStream(cs2); DPL.DrawText(100, 200, L"CS2"); DPL.SetContentStreamOptional(OCG1); DPL.SetOptionalContentGroupVisible(OCG1, 1); DPL.SaveToFile(L"newLayer.pdf");