[求助]：二进制数据块加入实体xdata时失败。

dayback

int nBufferLength=12001;
        resbuf* pRes= acutBuildList(1001,"AppName",1000,"XXXX",0);
        pRes->rbnext->restype= AcDb::kDxfXdBinaryChunk;
        pRes->rbnext->resval.rbinary.clen= nBufferLength;


        acdbRegApp("AppName");
        ads_name entlast;
        acdbEntLast(entlast);
        acdbGetObjectId(m_idLayer0,entlast);
        AcDbObject* pObj;
        if (Acad::eOk == acdbOpenObject(pObj,m_idLayer0,AcDb::kForWrite))
        {
                Acad::ErrorStatus es=pObj->setXData(pRes);
                pObj->close();
        }
        if (Acad::eOk == acdbOpenObject(pObj,m_idLayer0,AcDb::kForRead))
        {
                resbuf* pGetRes;
                pGetRes=pObj->xData("AppName");
                pObj->close();
        }

这个小小的测试程序都失败了？为什么呢？

binbin

有长度限制，不记得了，查查

wwddzz

不错！

cadrd

pRes->rbnext 的数据没有准备好，resval.rbinary 只给其中一个值初始化了！

binbin

struct resbuf* res;
res = acutNewRb(AcDb::kDxfBinaryChunk);
ads_binary bin;
bin.clen = ....
bin.buf = (char*) ....
res->resval.rbinary = bin;
res->rbnext = 0;


For resbufs, binary data can only be up to 127 bytes.  And, the size field of an ads_binary structure is a short not a long since it only has to handle values up to 127.

If your binary data is larger than 127 bytes, then you'll have to break it up across multiple resbufs.