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Topic: PDDrawCosObjToWindow, etc.
Conf: (P-PDF) Developers, Msg: 132198
From: drolevar
Date: 5/4/2005 08:07 PM

I need to draw an image from a PDF document onto a window. As I know, the right function for this is PDDrawCosObjToWindow. I followed the hints and constructed a form XObject. The function does not raise an exception, but gives no output. Maybe I'm wrong with the matrix?
Can anyone advise me?
Below I give the code I used.

/*Begin Preparing Resource Dictionary*/
CosObj ResDict = CosNewDict(g_document, false ,5);
CosObj XObjDict = CosNewDict(g_document, false,1);
CosDictPut(XObjDict,ASAtomFromString("Im0"),obj);
CosObj cosProcSet = CosNewArray(g_document, false, 3);
CosArrayPut(cosProcSet, 0, CosNewName(g_document, false, ASAtomFromString("PDF")));
CosArrayPut(cosProcSet, 1, CosNewName(g_document, false, ASAtomFromString("Text")));
CosArrayPut(cosProcSet, 2, CosNewName(g_document, false, ASAtomFromString("ImageC")));

CosDictPut(ResDict,ASAtomFromString("XObject"), XObjDict);
CosDictPut(ResDict,ASAtomFromString("ProcSet"), cosProcSet);

/*End Preparing Resource Dictionary OK*/

CosObj FormType = CosNewInteger(g_document, false, 1);
CosObj Filter = CosNewName(g_document, false, ASAtomFromString("FlateDecode"));
CosObj Type = CosNewName(g_document, false, ASAtomFromString("XObject"));
CosObj Subtype = CosNewName(g_document, false, ASAtomFromString("Form"));
CosObj CosAttribute = CosNewDict(g_document, false,7);

/*Begin Creating BBOX*/
CosObj cosBBox = CosNewArray(g_document, false, 4);
ASFixedRect bboxRec;
memset(&bboxRec, 0, sizeof(bboxRec));

bboxRec.left = ASInt32ToFixed(0);
bboxRec.bottom = ASInt32ToFixed(0);
bboxRec.right = ASInt32ToFixed(1000);
bboxRec.top = ASInt32ToFixed(1000);

CosArrayPut(cosBBox, 0, CosNewFixed(g_document, false, bboxRec.left));
CosArrayPut(cosBBox, 1, CosNewFixed(g_document, false, bboxRec.bottom));
CosArrayPut(cosBBox, 2, CosNewFixed(g_document, false, bboxRec.right));
CosArrayPut(cosBBox, 3, CosNewFixed(g_document, false, bboxRec.top));
/*End Creating BBOX

/*Begin Creating Matrix*/
CosObj cosMatrix = CosNewArray(g_document, false, 6);
CosArrayPut(cosMatrix, 0, CosNewInteger(g_document, false, 1));
CosArrayPut(cosMatrix, 1, CosNewInteger(g_document, false, 0));
CosArrayPut(cosMatrix, 2, CosNewInteger(g_document, false, 0));
CosArrayPut(cosMatrix, 3, CosNewInteger(g_document, false, 1));
CosArrayPut(cosMatrix, 4, CosNewInteger(g_document, false, 0));
CosArrayPut(cosMatrix, 5, CosNewInteger(g_document, false, 0));
/*End Creating BBOX*/
CosDictPut(CosAttribute, ASAtomFromString("BBox"), cosBBox);
CosDictPut(CosAttribute, ASAtomFromString("Matrix"), cosMatrix);
CosDictPut(CosAttribute, ASAtomFromString("FormType"), FormType);
CosDictPut(CosAttribute, ASAtomFromString("Filter"), Filter);
CosDictPut(CosAttribute, ASAtomFromString("Type"), Type);
CosDictPut(CosAttribute, ASAtomFromString("Subtype"), Subtype);
CosDictPut(CosAttribute, ASAtomFromString("Resources"), ResDict);

char buff[50];
sprintf(buff,"q 1 0 0 1 0 0 /Im0 Do Q");
ASStm OpenedStream = ASMemStmRdOpen(buff, strlen(buff));

CosObj cosImgStrm = CosNewStream(g_document, true, OpenedStream, 0, false, CosAttribute, Filter, -1);
// I suppose it should be the user space to device space transformation matrix
ASFixedMatrix m = {7281, 0, 0, -7281, -65529, 5766552};

PDDrawCosObjToWindow(cosImgStrm, NULL, dc, 0, &m, NULL, NULL, NULL);


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