transfer custom data

[Anonymous]

for example, the readString() and writeString() and transefer data of ACHAR in custom entity,but I want to transfer the data of myself struct or class.how can i do? because the data is somehow complex.the data maybe array.

[Alexander.Rivilis]

You can use pair of method readBChunk() and writeBChunk()

[Anonymous]

how to use the readBchunk() and writeBchunk(),can make an example? my class or struct contain AcGePoint3d and char * and double type. and i have 1000 more this struct to transfer in my custom entity;tks!!!

[Balaji_Ram · Accepted solution]

Hello,

For example, to write the BChunk from a "lpsrc" of "len" bytes :

ads_binary binbuf;
binbuf.buf = (char*)malloc( len * sizeof(char));
binbuf.clen = len;
memcpy(binbuf.buf, lpsrc, len);
pFiler->writeBChunk(binbuf); 

 To read the saved BChunk :

ads_binary binbuf;
pFiler->readBChunk(&binbuf); 
int len = binbuf.clen;
void *lpsrc=binbuf.buf;

 But, in general you should try avoid using it for datatypes that have other alternatives. As an example, you can use "AcDbDwgFiler::readPoint3d" and "AcDbDwgFiler::writePoint3d" for AcGePoint3d data. So, try finding the appropriate methods for the data types that you have and only resort to BChunk if there is no other way.