Rotating text in Mac

I want to rotate text.I am using a set of ATSUI API's for the same but it is failing at point (marked with arrow) mentioned below .Could you pls help me out.

void drawInclinedText(WindowRef windowRef)
{
     ATSUStyle     myStyle ;
     ATSUTextLayout myTextLayout ;
     char          strTypo = "Typography";
     CGContextRef     myCGContext ;
     OSStatus     osErr = 0;
     UniCharCount     count = 1;
     ItemCount     itemCount = 1 ;
     
     ATSUAttributeTag     theTags[] = {kATSUSizeTag} ;
     ATSUAttributeTag     theTags     Layout[] = {kATSUCGContextTag};
     ByteCount          theSizes[] = {sizeof(Fixed)};
     ByteCount          theSizesLayout[] = {sizeof(CGContextRef)};
     Fixed               atsuSize = 12 ;
     ATSUAttributeValuePtr     theValues[] = {&atsuSize};
     ATSUAttributeValuePtr     theValuesLayout[] = {&myCGContext};
     
     osErr     =     ATSUCreateStyle(&myStyle);
     osErr     =     ATSUSetAttributes(myStyle,1,theTags,theSizes,theValues);
     osErr     =     ATSUCreateTextLayout(&myTextLayout);
     osErr     =     ATSUSetRunStyle(myTextLayout,myStyle,1,strlen(strTypo)-1);   <---------------------------------------------------------->
     osErr     =     ATSUSetLayoutControls(myTextLayout,itemCount,theTagsLayout,theSizesLayout,theValuesLayout);
     
     osErr     =     ATSUSetTextPointerLocation(myTextLayout,(Unichar*)strTypo,kATSUFromTextBeginning,kATSUToTextEnd,strlen(strTypo));
     
     osErr     =     QDBeginCGContext(GetWindowPort(windowRef),&myCGContext);
     CGContextRotateCTM(myCGContext,60);
     osErr     =     ATSUDrawText(myTextLayout,kATSUFromTextBeginning,kATSUtoTextEnd,150,150);
     CGContextFlush(myCGContext);

     osErr     =     QDEndCGContext(GetWindowPort(windowRef),&myCGContext);
     ATSUDisposeStyle(myStyle);
}

The above code fails for the line marked with arrow and the textLayout object is set to invalid.
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