How do I get DeviceN colorants? How do I edit coloants in an existing PDF page?

[Support]

Q:

 I have a device_n colorspace.  Fillcolorspace returns device_n which contains an array of names but how do I find what are there colorants? 

Also, can I use PDFNet to edit/change PDF content stream from

 ... /CS1 cs 1 1 1 1 1 1 1 1 scn

to 

... /CS1 cs 0 0 0 0 0 0 0 0 scn

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A:

To extract DeviceN colorant names you can use the following snippet:

// The names parameter shall be an array of name objects specifying the individual
// colour components. The length of the array shall determine the number of components in the
// DeviceN colour space, which is subject to an implementation limit.
ColorSpace device_n = ....
Obj cs = device_n.GetSDFObj();
Obj names = cs.GetAt(1);
int component_num = names.Size();
for (int i=0; i< component_num; ++i) {
   string n = names.GetAt(i).GetName()
}



> Also is there a way to change ... /CS1 cs ...

Yes, use the approach shown in ElementEdit sample (i.e. you would change the fill colorants to ColorPt(0,0,0,...)).