How to write a unicode text in pdf file

Dear Friends,
I am a beginner in acrobat pdf plug-in development. I was trying to write a unicode text (Tamil text) into pdf file.
Using same api I am able to write english text in time-roman, areal etc fonts. But I am not able to write tamil texts.
The code is as below:
        memset(&pdeFontAttrs, 0, sizeof(pdeFontAttrs));
        pdeFontAttrs.name = ASAtomFromString("Latha");
        pdeFontAttrs.type = ASAtomFromString("TrueType");
        pdeFont    = PDEFontCreateFromSysFont(                                        \
                        PDFindSysFont(&pdeFontAttrs, sizeof(pdeFontAttrs), 0),    \
                        kPDEFontCreateEmbedded);
        pdeText = PDETextCreate();
        PDETextAdd(pdeText, kPDETextRun, 0, (ASUInt8 *)buffer, _tcslen(buffer),
                                pdeFont, &gState, sizeof(gState), NULL, 0, &textMatrix, NULL);
        PDEContentAddElem(pdeContent, kPDEAfterLast, (PDEElement)pdeText);
        PDPageSetPDEContent(pdPage, gExtensionID);
        PDPageReleasePDEContent (pdPage, gExtensionID);
KIndly assume that PDEGraphicsState and PDETextMatrix are set properly set, I am not pasting entire code to avoid complexity.
Thank you,
Safiq

Dear lrosenth,
I went through some codes/suggestions in internet and I found that I need to have cmap file and cid font file for the respective font since pdf doesn't support unicode fonts directly.
Can you help me to know where can I get cmap file and cid font file for tamil language font Latha(TrueType) microsoft font.
Regards,
Safiq

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