In the attached file there is a project on VC ++ 5 and the project on LabView 6.0 (I have got used to these versions). In DLL 2 functions actually for check of working capacity DLL (Summa, Multi) and working function readdata which is intended for reading a file with data double, definitions of its size (filesize), creations of a file double for a data storage bufdat and transfers of this file in LabView. I have created on disk directory c: \LabViewDLL\ also has written down there DLL, VI, has created in this directory subdirectory VC ++ and has written down there the project on VC ++. I have checked up, Summa and Multi work normally, the size of a file also is defined correctly so probably DLL works. I very much would like to learn to transfer files from DLL on C/C ++ in LabView, in the further it to be necessary for me. Probably, I incorrectly initialize a array. Help, please.