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Delphi Error Invalid Variant Type Conversion

All rights reserved. If this resolves the exception, I'll explain why. Get Started Now Suggested Solutions Title # Comments Views Activity How to properly Free class instances created as actual parameters to methods in Delphi 6 70 348d Need to allow the The following code demonstrates the use of variants and some of the automatic conversions performed when variants are mixed with other types: var V1, V2, V3, V4, V5: Variant; I: Integer; news

The Crazy One 0 Message Author Comment by:styleress2002-08-29 PickZoneDM.PickZoneQry.FieldByName('WWS_MAXLDVOL').AsFloat := null; Is there a problem with the conversion? Warren Ashma Delphi Developer Wed, 18 Jun 1902 08:00:00 GMT Re:"Invalid variant conversion" error There is nothing wrong with your code except that you do not need to call edit immediately Variants that contain strings cannot be indexed. Quote> Hello everyone, > when I modify a field in my Delphi app: > with Table1 do > begin > Append; > http://www.delphigroups.info/2/00/242771.html

Using the Copy function on FastScript (that converts to Variant), if you do a Copy( var, 1, 2 ), the expected result is '00', but it will return '12', theorically... Thanks, WS 0 Question by:Waterstone Facebook Twitter LinkedIn Google LVL 5 Best Solution bydelphized I can't help you with the ADO (probably it returns a nil value in the function ) Fast Reports forum > Fast Reports Products > FastReport 3.0 GRFrones Mar 1 2005, 10:04 AM I'm having trouble with variables on FastReport...I added the function AnsiReplaceStr to my FastReport, using Your Privacy - Legal Statements Copyright © 1998-2015 Developer Express Inc.All trademarks or registered trademarks are property of their respective owners

Should it be: AsFloat := 0; 0 LVL 44 Overall: Level 44 Delphi 4 Message Expert Comment by:CrazyOne2002-08-29 Try this PickZoneDM.PickZoneQry.FieldByName('WWS_MAXLDVOL').AsVariant:= null; or PickZoneDM.PickZoneQry.FieldByName('WWS_MAXLDVOL').Clear; 0 LVL 27 Now I use MSSQL with BDE (for the moment) and I continue using the system tables (with the stored procedures) to retrieve information about indexes and users and ... 0 Featured Post Looking for New Ways to Advertise? The same is true when passing a Variant to an OleVariant function parameter.

Join & Ask a Question Need Help in Real-Time? Except for comparisons, which always return a Boolean result, any operation on a variant value returns a variant result. But the ability to create custom scanning profiles al… Document Imaging Document Management OCR Images and Photos Photos / Graphics Software Embedded vs hosted images in email signatures Video by: Exclaimer have a peek here Other standard routines that operate on variant arrays include VarArrayDimCount, VarArrayLowBound, VarArrayHighBound, VarArrayRef, VarArrayLock, and VarArrayUnlock.

Code compiles and work correctly. Moreover, illicit operations on variants often result in run-time errors, where similar mistakes with regular variables would have been caught at compile time. How to find position where a sequence drops off to zero Tenant claims they paid rent in cash and that it was stolen from a mailbox. sad herman Peter Batte Delphi Developer Wed, 18 Jun 1902 08:00:00 GMT Re:"Invalid variant conversion" error Try removing the EDIT line.

GRFrones Apr 6 2005, 10:59 AM Hi... https://www.experts-exchange.com/questions/20343829/Invalid-Variant-Type-Conversion-Error.html Join & Ask a Question Need Help in Real-Time? Term for "professional" who doesn't make their living from that kind of work How did night fighter aircraft manage to shoot down their foes in World War II? For example: V: Variant; ...

Out-of-range assignments often result in the target variable getting the highest value in its range. navigate to this website the Table1.ReadOnly is set to false. Please refer to the DevExpress.com Website Terms of Use for more information. Get 1:1 Help Now Advertise Here Enjoyed your answer?

Why don't you connect unused hot and neutral wires to "complete the circuit"? Emb certainly do not release low quality code so that they can just fix it later and charge for an upgrade. –David Heffernan Dec 6 '10 at 13:07 1 @The Standard integer fields work fine in this situation.Thanks, Serge// TEST CODEprocedure TfrmGrids.Button1Click(Sender: TObject); var KeyValues: Variant; i64: int64; i: Integer; begin i64 := 1; i := 1;// THIS WORKS keyValues := http://completeprogrammer.net/delphi-error/delphi-error-array-type-required.html In fact it is better for everyone (vendor and customer) that this is the case.

Join them; it only takes a minute: Sign up Invalid variant type error Delphi 2010 up vote 0 down vote favorite // interface iccItem = class ID : String; DATA : It will return '12'... I appreciate this... –Focker Dec 6 '10 at 2:59 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using

For example: if Null > -3 then ...

WS 0 LVL 27 Overall: Level 27 Delphi 26 Message Expert Comment by:kretzschmar2004-02-10 well, i have d5, but no mssql-server, so i can't check your problem, but maybe there are Using Delphi 5 with the same form it works perfectly. Covered by US Patent. Variants in Expressions All operators except ^, is, and in take variant operands.

Find all posts by digitiger « Previous Thread | Next Thread » Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Use the VarArrayRedim function to resize a variant array. Join Now For immediate help use Live now! click site Converts real formats.

Is there already a persistent field component and handle the event OnChange? -- Lluis Turr, Barcelona. Do not perform such operations unnecessarily, since they are memory-inefficient. I get an error "Invalid variant conversion".