Where do you get the error? In the substr() loop?

Also, have you tried assigning the blob to a variable and referencing the var in the substr()?

Gary

>>>>>>>>How to copy the contents of a blob field in a table into an array of bytes.
>>>>>>>>
>>>>>>>
>>>>>>>VFP doesn't have byte data type. Please clarify.
>>>>>>
>>>>>>It does *sortof*. I've defined arrays as byte (DIME aTest[100] as BYTE, aTest = 'X') to pass to COM servers and they are recognized as VT_UI1. TYPE() in VFP returns 'N'. I guess it depends on what the array is to be used for.
>>>>>
>>>>>
>>>>>Sergey & Gary,
>>>>>
>>>>>Thanks for responding to my posting.
>>>>>
>>>>>Actually, my purpose has to do with COM. I'm developing a COM server. The client will pass a reference (pointer) to a byte array to the COM sever. The COM server will transfer the data from the blob field into the byte array.
>>>>>
>>>>>So, how, in my VFP COM server can I transfer the data from the blob into the byte array?
>>>>>
>>>>>Looks like VFP Dimension statement knows about the Byte data type, by the CAST function does not.
>>>>>
>>>>>Thanks,
>>>>>Jim
>>>>
>>>>
>>>>Does something like the following work?
>>>>
>>>>DIME MyPassedArray[LEN(MyBlob)]
>>>>
>>>>FOR nInc = 1 TO LEN(MyBlob)
>>>> MyPassedArray[nInc]=SUBSTR(MyBlob,nInc,1)
>>>>ENDFOR
>>>
>>>Gary,
>>>I just got to try your suggestion. The blob field is part of a view. When I try the code you suggest:
>>>
>>> FOR nIx = 1 TO nBlobSize
>>> nBlobData[nIx] = SUBSTR(BlobData, nIx, 1)
>>> ENDFOR
>>>
>>>Where, BlobData is the name of the blob field in the view. I get the following error message:
>>>
>>> Function argument value, type, or count is invalid
>>>
>>>I get the sam error if I use vMyView.BlobData as the first argument.
>>>Again, thanks for your suggestions.
>>>Jim
>>
>>What is the type of the BlobData field?
>
>Naomi,
>It is a blob in the original database from which I create the view. BlobData is the name of the field in the VFP view. VARTYPE(BlobData) returns "G". Does that mean that it is no longer a blob?
>In any case, I am trying to get the binary data out of that blob field.
>In the view, I just changed the field to say CAST(myBlobField AS BLOB) AS BlobData.But, VARTYPE(BlobData) still returns "G:
>
>The original database is Firebird.I use a VFP parametrized view to get a specific record in the table, and now want to get the blob field in that record.
>
>Hmmm
>
>Jim