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Could not convert variant of type (Array Byte) into type (Integer) |
Tue, May 26 2015 1:24 AM | Permanent Link |
Adam H. | Hi,
I'm in the process of trying to update one of my projects from Delphi 2007 to Delphi XE2 and have come across the following error: "Could not convert variant of type (Array Byte) into type (Integer)" The code which this is executing on is: if Q1.Fields[i].value <> Q2.Fields[i].value What's strange is that Q2 is simply an exact copy of the data before it's edited. ie: select * into Memory\Q2 from Mytable where ID = 123 Then Q1 is similar: select * from Mytable where ID = 123 I then compare the two to see if any changes have been made. This works fine as I go through the fields until I hit a field that is a blob. Then it errors out as per above. This script works fine in Delphi 2007. I know that XE2 has some changes to support unicode, etc but I'm not sure how that should affect this code. This is using DBISAM 4.41 b1 In my instance the process runs through the whole fieldcount of the dataset, so the datatype will be different from one to the next. (ie, integers, strings, dates and blobs). Thanks & Regards Adam. |
Tue, May 26 2015 2:34 AM | Permanent Link |
Roy Lambert NLH Associates Team Elevate | Adam
Since I'm still using D2006 I don't have direct experience but generally when I've had those types of errors its because the field is null. Roy Lambert |
Tue, May 26 2015 3:09 AM | Permanent Link |
Adam H. | Hi Roy,
> Since I'm still using D2006 I don't have direct experience but generally when I've had those types of errors its because the field is null. Yeah - I've already had issues with the way null's are handled differently. ie: length(table1field1.value) used to return 0 in D2007, and now raises an exception if the value is null in XE2. I swear Delphi 7 (with coderush ) was the best IDE I've had, and ever since then things have gotten buggier. I paid for XE2 primarily to get over the issues I had in D2007 and found more new bugs and issues than it corrected. Anyway - back to the question in hand, in this instance the value is not null. It contains the exact same value, but it's definitely not null. In my searches I've just come across QC 116168 which appears to have a very similar issue with XE2, XE3 and XE4 and is still open with no fix! Cheers Adam. |
Tue, May 26 2015 4:18 AM | Permanent Link |
Roy Lambert NLH Associates Team Elevate | Adam
What about trying .AsString rather than .Value. I think all of the field types coerce to a string. Roy Lambert |
Tue, May 26 2015 7:38 PM | Permanent Link |
Adam H. | Hi Roy,
> What about trying .AsString rather than .Value. I think all of the > field types coerce to a string. Thanks for that. I've put in code to use .asstring for the blob fields, but left the others as is (so the system can still tell differences between null values and those not null). I'm not sure just how many places in code this will effect, but I guess I'm going to find out. Once again, thanks for your help! Cheers Adam |
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