How to solve this??convert CMYKBlack to grayscale

Question

Hi i need to convert CMYKBlack to grayscale.here is the code im using....
in case of textart..
if(style.fillPaint==1)
if( style.fill.color.kind == kFourColor &&
((style.fill.color.c.f.black>0 && style.fill.color.c.f.cyan==0 &&
style.fill.color.c.f.yellow==0 && style.fill.color.c.f.magenta==0) ||
(style.fill.color.c.f.black==0 && style.fill.color.c.f.cyan==0 &&
style.fill.color.c.f.yellow==0 && style.fill.color.c.f.magenta==0)))
style.fill.color.kind=kGrayColor;
percentageOfGray=0;
percentageOfGray=(style.fill.color.c.f.cyan) * 30/100;
percentageOfGray=percentageOfGray + ((style.fill.color.c.f.magenta) * 59/100);
percentageOfGray=percentageOfGray + ((style.fill.color.c.f.yellow) * 11/100);
percentageOfGray=percentageOfGray + (style.fill.color.c.f.black);
if (percentageOfGray*100 >100)
percentageOfGray=1;
style.fill.color.c.g.gray=percentageOfGray;
error = sAITextRun->SetTextRunPathStyle (line,&style );
error = sAITextRun->SetTextRunPathStyle (line,&style )---------This syntax is used in illustrator 10 for setting the converted color..what is the similar syntax to be used in illustrator cs2.
Please someone help me.......
Thanks in advance......
Subha.....

Answer 1

Sorry, I've been sick for a few days, just got back. Hopefully this will still be useful to you (or someone else!).
First, I just want to mention that there's a suite for doing this kind of thing, the AIColorConversionSuite (AIColourConversion.h). I'd take a look at that; it might simply your conversion code.
As for setting the text colour in CS on, here's the code we use in our application for setting text's stroke colour:
------------- snip --------------
ASSERT(sATEPaint);
ASSERT(sAITextFrame);
TextRangeRef textRangeRef = 0;
// this code is inside an object that represents
// text art, so it has a member that has the art
// handle. This handle is retrieved using GetHandle()
// so just replace 'GetHandle()' with your AIArtHandle
// variable
AIErr error = sAITextFrame->GetATETextRange(GetHandle(), &textRangeRef);
THROW_EXCEP_IF(error);
ATE::ITextRange textRange(textRangeRef);
ATE::ICharFeatures charFeatures = textRange.GetUniqueLocalCharFeatures();
// colour is a pointer to our own colour object; its
// a pointer so that a 'null' stroke can be set
if (colour) {
ATE::ApplicationPaintRef paintRef = 0;
AIColor aiColour;
// this is the colour model of the document,
// which is either CMYK or RGB
EColourModel model = CDocumentList::GetCurrentDocument().GetColourModel();
// we have classes, CRGBColour & CCMYKColour that automatically do
// colour conversion for us -- they use the AIColorConversionSuite
if (eColourModelRGB == model) {
aiColour = (AIColor)(*colour);
} else if (eColourModelCMYK == model) {
aiColour = (AIColor)(CCMYKColour(*colour));
error = sATEPaint->CreateATEApplicationPaint(&aiColour, &paintRef);
THROW_EXCEP_IF(error);
ATE::IApplicationPaint paint(paintRef);
// obviously you'd use SetFillColor here if you wanted fill
charFeatures.SetStrokeColor(paint);
charFeatures.SetStroke(true);
} else {
charFeatures.SetStroke(false);
textRange.SetLocalCharFeatures(charFeatures);
------------- snip --------------
Note that THROW_EXCEP_IF is a macro of ours that throws an exception if error != kNoErr.