Read Blob Field Data Sizewith FileGDBAPI By C++

LiuYingying

Hai, i want to read blobs field data  size from my filegdb by fileGDBAPI with C++, But i  always get NULL Binary data, please check what is wrong;

 

## arcgis catlog

 

My C++ Code:

My Console Log:

How can i get the Blob Data Size! thank your for feedback！