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  • ANY material writen in/for DELPHI around the graphics topic?

    - by José Eduardo
    Does anyone knows ANY material writen in/for DELPHI around the graphics topic? Planning to build a software for medical imaging processing . Thinking in 3D UI to absorve the power of nvidias GTX graphics card, and some real-time 2D processing integrated with high-end scanners. Please dont take this as a "rant" but, we have zillions of C++ books writen about that kind of topic and nothing for pascal/delphi. If you have some experience could you comment about that? Is it better to learn c++, to have access to that material? Can i go with delphi? I have experience with delphi, but none with graphics... And i have a deadline... Thanks.

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  • External exception C000001E (STATUS_INVALID_LOCK_SEQUENCE)

    - by adnan
    I'm building a web service client. I've used many other functions from this web service, i've finished most of this work. But now i'm getting this error "External exception C000001E" as i try to use the function as example below. Var asi_ : Asi.MCCI_AR000001TR_PortType; asi_Istek : Asi.QUQI_IN000001TR01; asi_Cevap : Asi.QUQI_IN000002TR01; Begin // bla.. blaa. setting wsse header etc. giving httprio parameters .. // bla... blaa.. some code here , creating the asi_Istek, setting the values etc. Try asi_Cevap := asi_.MCCI_AR000001TR_QUQI_IN000001TR(asi_Istek); // **error** Except On e: Exception Do Begin ShowMessage(e.Message); // External exception C000001E End; End; that is sample code, my code is something like that, and i've many other smilar functions of this webservice, which are working without error, but here is missing something but what ? what is the "External exception C000001E" has anyone idea ? thanks.

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  • Variants recursively uses itself?

    - by Mason Wheeler
    I'm trying to build a debug version of rtl140.bpl to make debugging apps with runtime packages easier. I built the DPK and ran DCC32 on it, and it gets a ways in, then dies. C:\Program Files (x86)\Embarcadero\RAD Studio\7.0\source\Win32\rtl\sys\Variants.pas(1072) Fatal: F2092 Program or unit 'Variants' recursively uses itself But looking at Variants.pas, I can't see how. It only uses SysUtils and Types in the interface section, and neither of those use Variants, or use anything that uses Variants. Does anyone have any idea why this is breaking?

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  • THttprio onBeforeExecute changing the soapRequest

    - by adnan
    I've imported some wsdl for a project. i want to change the SoapRequest on HttpRio onBeforeExecute event, but as i changed the request, im getting some errors how can i change the request xml file with stringReplace function on this event. i've tried to change the size of stream, i ve changed the encoding etc. but anyway it didnt work. example procedure TForm1.RiomBeforeExecute(const MethodName: string; SOAPRequest: TStream); var sTmp : TStringList; begin sTmp:=TStringList.Create; SOAPRequest.Position := 0; sTmp.LoadFromStream(SOAPRequest); sTmp.Text := StringReplace(sTmp.Text,'blablaa','bla',[RfReplaceAll]); sTmp.SaveToStream(SOAPRequest); // blaa blaa... end;

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  • Auto sizing column in TVirtualStringTree

    - by Larry Lustig
    Climbing the learning mountain of TVirtualTreeView, I'm attempting to create a custom descendant that ensures that, when the control is resized, the width of the last column exactly fills control's width without requiring a horizontal scroll bar. I see a number of items (a method and a number of events) pertaining to "AutoFitColumns", but not documentation covering this feature. Can I use AutoFitColumns to automatically resize my last column and if so, how.

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  • BroadCast Messages to multiple client on the same machine

    - by Christopher Chase
    I need to have a server on one machine that broadcasts a message sever second or so, Kind of like a service discovery. The message needs to be received by multiple client processes that could be on the same machine or different machines. Im using delphi7, with indy 9.0.18 where im stuck is if i should be using UDP or IP MultiCast or if its even possible... Ive managed to get it to work with IP Multi Cast with one client per machine, but even after many trys with different bindings.. max/min ports etc, i cant seem to find a solution.

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  • Project links in RAD Studio Welcome page do not work

    - by vcldeveloper
    Hi, As you know, welcome page in RAD Studio shows a list of recent projects, and you can open each project by clicking on its name. My problem is that if the project is located somewhere My Documents folder, then the link in welcome page does not work! It works fine for projects which are located outside My Documents, but no links to anything inside My Documents work. It's been a while I am having this problem both in RAD Studio 2009 and RAD Studio 2010 on Windows Vista and Windows 7 (64-bit). I tried running the IDE as administrator to see if it works, but it didn't. I think it must be something related to IE security settings. Any idea? Thanks

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  • TIdTCPClient to SSL

    - by waza123
    When I connect to 80 port, plain text web site using TIdTCPClient component, all works fine, data is received without a problem, but, when I connect to 443 port, SSL web site, data not always came. Maybe something with my receive data block ? Need advice. while not Terminated do begin SetLength(data, 0); ws.IOHandler.ReadBytes(data, -1); if Length(data) = 0 then break; // processing_my(data); end; Thanks

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  • Strange rare out-of-order data received using Indy

    - by Jim
    We're having a bizarre problem with Indy10 where two large strings (a few hundred characters each) that we send out one after the other are appearing at the other end intertwined oddly. This happens extremely infrequently. Each string is a complete XML message terminated with a LF and in general the READ process reads an entire XML message, returning when it sees the LF. The call to actually send the message is protected by a critical section around the call to the IOHandler's writeln method and so it is not possible for two threads to send at the same time. (We're certain the critical section is implemented/working properly). This problem happens very rarely. The symptoms are odd...when we send string A followed by string B what we received at the other end (on the rare occasions where we have failure) is the trailing section of string A by itself (i.e., there's a LF at the end of it) followed by the leading section of string A and then the entire string B followed by a single LF. We've verified that the "timed out" property is not true after the partial read - we log that property after every read that returns content. Also, we know there are no embedded LF characters in the string, as we explicitly replace all non-alphanumeric characters in the string with spaces before appending the LF and sending it. We have log mechanisms inside the critical sections on both the transmission and receiving ends and so we can see this behavior at the "wire". We're completely baffled and wondering (although always the lowest possibility) whether there could be some low-level Indy issues that might cause this issue, e.g., buffers being sent in the wrong order....very hard to believe this could be the issue but we're grasping at straws. Does anyone have any bright ideas?

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  • DUnit: How to run tests?

    - by Ian Boyd
    How do i run TestCase's from the IDE? i created a new project, with a single, simple, form: unit Unit1; interface uses Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls; type TForm1 = class(TForm) private public end; var Form1: TForm1; implementation {$R *.DFM} end. Now i'll add a test case to check that pushing Button1 does what it should: unit Unit1; interface uses Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls; type TForm1 = class(TForm) Button1: TButton; procedure Button1Click(Sender: TObject); private public end; var Form1: TForm1; implementation {$R *.DFM} uses TestFramework; type TForm1Tests = class(TTestCase) private f: TForm1; protected procedure SetUp; override; procedure TearDown; override; published procedure TestButton1Click; end; procedure TForm1.Button1Click(Sender: TObject); begin //todo end; { TForm1Tests } procedure TForm1Tests.SetUp; begin inherited; f := TForm1.Create(nil); end; procedure TForm1Tests.TearDown; begin f.Free; inherited; end; procedure TForm1Tests.TestButton1Click; begin f.Button1Click(nil); Self.CheckEqualsString('Hello, world!', f.Caption); end; end. Given what i've done (test code in the GUI project), how do i now trigger a run of the tests? If i push F9 then the form simply appears: Ideally there would be a button, or menu option, in the IDE saying Run DUnit Tests: Am i living in a dream-world? A fantasy land, living in a gumdrop house on lollipop lane?

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  • getwindowtext not retrieving text

    - by omair iqbal
    I tried the following code but it does not retrieve text from foreground window! procedure TForm1.Button1Click(Sender: TObject); var title : pansichar; s : string; begin GetWindowText(GetForegroundWindow(), title,GetWindowTextLength(GetForegroundWindow()) + 1); s := title; showmessage(s); end;

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  • TArray<Byte> VS TBytes VS PByteArray

    - by Ken Bourassa
    Those 3 types are very similar... TArray is the generic version of TBytes. Both can be casted to PByteArray and used as buffer for calls to Windows API. (with the same restrictions as string to Pchar). What I would like to know: Is this behavior "by design" or "By Implementation". Or more specifically, could it break in future release?

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  • Handling update errors in multiple records in the TClientDataset's ReconcileError method

    - by Fabio Gomes
    I'm trying to use the ReconcileError event to allow the user to correct the data after an update error which occurred in a specific record among others. Example: I have a dataset with one field and 3 records, this field have a unique constraint on the database, then I change one value to conflict when it reaches the database, then I call ApplyUpdates on the Dataset. This will generate an error (violation of unique constraint) in the provider and abort the applyupdates process, returning raAbort in the Action var of the ReconcileError method. In the ReconcileError method I tryied to use: Action := HandleReconcileError(aDataSet, UpdateKind, E); ** EDIT ** After debugging and dumping the DataSet records which were returned from the server, I noticed that there are 2 records in this Dataset, the first is the Old record and the second have all the changes I made to the first record. I'm a bit confused, will I always get this DataSet with 2 records? I thought that it should have only one record with the Old/New values. Thanks.

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  • AContext.data can be nil?

    - by waza123
    In this code, as you see on Connect, AContext.Data is filled with something TmyTThreadList = class(TThreadList) id: integer; end; var unique_id:integer; procedure TfrmTestIdTCPServer.IdTCPServerConnect(AContext: TIdContext); begin CS.Enter; try inc(unique_id); finally CS.Leave; end; AContext.Data := myTThreadList.Create; list := myTThreadList(AContext.Data).LockList; try myTThreadList(AContext.Data).id := my_unique_id; list.Add(myTThreadList(AContext.Data)); finally myTThreadList(AContext.Data).UnlockList; end; end; then on disconnect, coder is checking here for Acontext.Data < nil procedure TfrmTestIdTCPServer.IdTCPServerDisconnect(AContext: TIdContext); var begin if AContext.Data <> nil then begin The question is, why he is checking for nil ? Thanks. EDIT: I'm asking this, because when I do the same, onExecute I access AContext.Data , and sometimes (when in same time is connecting many clients) AContext.Data is empty, access violation appears.

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  • MultiCast Messages to multiple clients on the same machine

    - by Christopher Chase
    Im trying to write a server/service that broadcasts a message on the lan ever second or so, Kind of like a service discovery. The message needs to be received by multiple client programs that could be on the same machine or different machines. But there could be more than one program on each machine running at the same time. Im using delphi7, with indy 9.0.18 where im stuck is if i should be using UDP or IP MultiCast or if its even possible... Ive managed to get it to work with IP Multi Cast with one client per machine, but even after many trys with different bindings.. max/min ports etc, i cant seem to find a solution.

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  • Ho to convert classname as string to a class ?

    - by Roland Bengtsson
    I have classnames in a stringlist. For example it could be 'TPlanEvent', 'TParcel', 'TCountry' etc. Now I want to find out the sizes by looping the list. It works to have: Size := TCountry.InstanceSize; But I want it like this: for i := 0 to ClassList.Count - 1 do Size := StringToClass(ClassList[i]).InstanceSize; Obviously my question is what to write instead of method StringToClass to convert the string to a class.

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  • Components for creating Archives

    - by John
    Hello, I'm searching for a simple,free component for creating archives with the capability of adding files to an already existing archive.Compressions is not a matter as much as performance so even "store" will be useful. Please help me find one.

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  • Lock-Free, Wait-Free and Wait-freedom algorithms for non-blocking multi-thread synchronization.

    - by GJ
    In multi thread programming we can find different terms for data transfer synchronization between two or more threads/tasks. When exactly we can say that some algorithem is: 1)Lock-Free 2)Wait-Free 3)Wait-Freedom I understand what means Lock-free but when we can say that some synchronization algorithm is Wait-Free or Wait-Freedom? I have made some code (ring buffer) for multi-thread synchronization and it use Lock-Free methods but: 1) Algorithm predicts maximum execution time of this routine. 2) Therad which call this routine at beginning set unique reference, what mean that is inside of this routine. 3) Other threads which are calling the same routine check this reference and if is set than count the CPU tick count (measure time) of first involved thread. If that time is to long interrupt the current work of involved thread and overrides him job. 4) Thread which not finished job because was interrupted from task scheduler (is reposed) at the end check the reference if not belongs to him repeat the job again. So this algorithm is not really Lock-free but there is no memory lock in use, and other involved threads can wait (or not) certain time before overide the job of reposed thread. Added RingBuffer.InsertLeft function: function TgjRingBuffer.InsertLeft(const link: pointer): integer; var AtStartReference: cardinal; CPUTimeStamp : int64; CurrentLeft : pointer; CurrentReference: cardinal; NewLeft : PReferencedPtr; Reference : cardinal; label TryAgain; begin Reference := GetThreadId + 1; //Reference.bit0 := 1 with rbRingBuffer^ do begin TryAgain: //Set Left.Reference with respect to all other cores :) CPUTimeStamp := GetCPUTimeStamp + LoopTicks; AtStartReference := Left.Reference OR 1; //Reference.bit0 := 1 repeat CurrentReference := Left.Reference; until (CurrentReference AND 1 = 0)or (GetCPUTimeStamp - CPUTimeStamp > 0); //No threads present in ring buffer or current thread timeout if ((CurrentReference AND 1 <> 0) and (AtStartReference <> CurrentReference)) or not CAS32(CurrentReference, Reference, Left.Reference) then goto TryAgain; //Calculate RingBuffer NewLeft address CurrentLeft := Left.Link; NewLeft := pointer(cardinal(CurrentLeft) - SizeOf(TReferencedPtr)); if cardinal(NewLeft) < cardinal(@Buffer) then NewLeft := EndBuffer; //Calcolate distance result := integer(Right.Link) - Integer(NewLeft); //Check buffer full if result = 0 then //Clear Reference if task still own reference if CAS32(Reference, 0, Left.Reference) then Exit else goto TryAgain; //Set NewLeft.Reference NewLeft^.Reference := Reference; SFence; //Try to set link and try to exchange NewLeft and clear Reference if task own reference if (Reference <> Left.Reference) or not CAS64(NewLeft^.Link, Reference, link, Reference, NewLeft^) or not CAS64(CurrentLeft, Reference, NewLeft, 0, Left) then goto TryAgain; //Calcolate result if result < 0 then result := Length - integer(cardinal(not Result) div SizeOf(TReferencedPtr)) else result := cardinal(result) div SizeOf(TReferencedPtr); end; //with end; { TgjRingBuffer.InsertLeft } RingBuffer unit you can find here: RingBuffer, CAS functions: FockFreePrimitives, and test program: RingBufferFlowTest Thanks in advance, GJ

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  • How to execute a program on PostBuild event in parallel?

    - by John
    I managed to set the compiler to execute another program when the project is built/ran with the following directive in project options: call program.exe param1 param2 The problem is that the compiler executes "program.exe" and waits for it to terminate and THEN the project executable is ran. What I ask: How to set the compiler to run both executables in paralel without waiting for the one in PostBuild event to terminate? Thanks in advance

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  • How to show scrollbars in TScrollBox after it has been made visible again?

    - by aleluja
    Hi, I've ran into one small problem. I am dynamicaly generating some controls and place them on a TScrollbox component. But i noticed that if scrollbox is visible, user can clearly see each of the controls being created and placed. So it looksl ike lots of work is being done and it is slow. I hid the scrollbox and generated all the controls on it, which took much less time and no flickering and alike. But here's the problem. When i unhide the scrollbox, its' scrollbar doesn't appear untill i actually resize the form. (The alignment of scrollbox is alClient) Any ideas on how to fix this? Tried repainting, but it didn't work. Refresh didn't work either. Thank you

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  • How to make this OO?

    - by John
    Hello, Sorry for the poor title,I'm new to OOP so I don't know what is the term for what I need to do. I have, say, 10 different Objects that inherit one Object.They have different amount and type of class members,but all of them have one property in common - Visible. type TObj1=class(TObject) private a:integer; ...(More members) Visible:Boolean; end; TObj2=class(TObject) private b:String; ...(More members) Visible:Boolean; end; ...(Other 8 objects) For each of them I have a variable. var Obj1:TObj1; Obj2:TObj2; Obj3:TObj3; ....(Other 7 objects) Rule 1: Only one object can be initialized at a time(others have to be freed) to be visible. For this rule I have a global variable var CurrentVisibleObj:TObject; //Because they all inherit TObject Finally there is a procedure that changes visibility. procedure ChangeObjVisibility(newObj:TObject); begin CurrentVisibleObj.Free; //Free the old object CurrentVisibleObj:=newObj; //assign the new object CurrentVisibleObj:= ??? //Create new object CurrentVisibleObj.Visible:=true; //Set visibility to new object end; There is my problem,I don't know how to initialize it,because the derived class is unknown. How do I do this? I simplified the explanation,in the project there are TFrames each having different controls and I have to set visible/not visible the same way(By leaving only one frame initialized). Sorry again for the title,I'm very new to OOP.

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  • Passing an Object as an Interface

    - by Christopher Chase
    This should be a simple answer, i believe its going to be a no, but taken from a larger project, i have an interface and the procedure iMyUnknown= interface(IInterface) ['..GUID..'] end; procedure WorkObject(iObj :iMyUnknown); i know this works var MyUnknown : iMyUnknown; begin if supports(obj, iMyUnknown, MyUnknown) then WorkObject(MyUnknown); But is it possible to do something like this? if supports(obj, iMyUnknown) then WorkObject(obj as iMyUnknown);

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  • Repeating procedure for every item in class

    - by Hendriksen123
    Data.XX.NewValue := Data.XX.SavedValue; Data.XX.OldValue := Data.XX.SavedValue; I need to do the above a large number of times, where XX represents the value in the class. Pretending there were 3 items in the list: Tim, Bob, Steve. Is there any way to do the above for all three people without typing out the above code three times? (Data is a class containing a number of Objects, each type TList, which contain OldValue, NewValue and SavedValue)

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