TRODynamicRequest.DoWriteParams requires System.Variants.NullStrictConvert

Data Abstract
1

I just spent several hours chasing a crash in RO/DA TRORequestParam

It only occured in one of my RO/DA applications and it only occured in case it was a master/child table (due to MethodName switch and RefreshParams)

After a lot of debugging I found out it was caused by global System.Variants.NullStrictConvert setting.

Are there any plans of removing this constraint?

2

Hi,

hmm, nobody for the latest 17 years complained about this case…

Can you specify what exactly line(s) in Data Abstract affects to NullStrictConvert settings, pls?

also a small testcase will be appreciated.

you can drop email to support@ for keeping privacy

3

Hi,

It is line 1129 of uRODynamicRequest.pas in my case
l_unicodeString := aParam.AsWideString;

It’s DA3, don’t know if it is specific to DA3

4

FYI:

The fSimpleValue:=Null is the culprit
from
procedure TRORequestParam.CopyRODLParam(aSourceParam: TRODLOperationParam; aPersistValues: Boolean; aOldParams: TRORequestParamCollection);
var
l_param: TRORequestParam;
begin
Name := aSourceParam.Name;
Flag := aSourceParam.Flag;
DataType := StrToDataType(aSourceParam.DataType);

fSimpleValue := Null;
if DataType = rtUserDefined then
TypeName := aSourceParam.DataType
else
TypeName := ‘’;

FYI: The AsString function does not suffer from the same issue.
I can imagine that most people use string (which is also a 16bit string nowadays)

5

Hi,

DA3 was released ages ago …

try to change uRODynamicRequest.pas as

function TRORequestParam.GetAsWideString: UnicodeString;
begin
  Result := VarToUnicodeStrDef(fSimpleValue, ''); // or VarToWideStrDef for DA3
end;

hmm, it already has code like

function TRORequestParam.GetAsString: string;
begin
  Result := VarToStrDef(fSimpleValue, '');
end;

so it shouldn’t depend on NullStrictConvert setting

6

FTR, we really do not support DA3 anymore, it is was released so long ago that even our download page that goes back to 2009 doesn’t have it anymore ;).

Please update to a newer version of DA.