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vfbb

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vfbb last won the day on June 6

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  • Delphi-Version
    Delphi 10.4 Sydney

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  1. vfbb

    Cannot copy a TCard in the Structure Panel

    Yes. Sorry, I forgot to tell, I do the same. This occur randomly with any control. I believe they didn't fix it because it doesn't seem easy to replicate.
  2. vfbb

    Cannot copy a TCard in the Structure Panel

    This problem is old, it is at least 2 or 3 years old.
  3. The best strategy should be analyzed for each case, but I can tell you that 99% of the time the implementation of binary tree using a simple ordered list will be much faster than creating objects for nodes, because you need to balance the tree all over moment, while the simulation of the binary tree in a simple ordered list you don't have to balance anything (although the List.Insert or List.Delete can call a very large Move, the CPUs are already optimized for that and it will be much faster that go through node by node balancing the tree to maintain the ideal number of levels of a binary tree which is Log N in base 2, besides the costs of creating the objects of the nodes).
  4. The binary tree is essential in programming, especially when you want to insert, remove, search and maintain an ordered list at the same time, with an excellent performance. I use it, but on a day-to-day basis we don’t use it that much because generally what we need is just a simple sorting, example List.Sort, or a list with a fast search, example TDictionary, or inserting, removing and sorting small lists (for example example lists with less than 200 items). The ordering of delphi uses QuickSort which has the same complexity / performance as adding + ordering a binary tree O (N * (Log N)). Just like the dictionary has similar performance in the search. But as I said, when you want to add, remove, search quickly and sort the same list, you better use a binary tree. Delphi does have support for this in TList<T>, you don't need to create a class or make implementations as alcinoe did, you just need to use for example TList<Integer>, and use List.BinarySearch to add, remove or search. Note: To add you will use BinarySearch because although it returns False, which is what it should return when it cannot be found, it also returns the Index, which is where this item should be, so you will insert the item in the position of that index that BinarySearch returned. That way you will already insert sorted, the list will always be sorted, that is, any operation like this will be very fast, because it uses BinarySearch which has the complexity O (Log N), so your list will be a Binary Tree. 😉
  5. vfbb

    Your RAD Studio 10.4 Sydney issues

    The browsing path works fine. It just not work when the Code Insight is completing in background, then the Ctrl + Click may not work. But while this, you can simple click in the unit name in uses, and press Ctrl + Enter.
  6. vfbb

    Where to put SQLite/MDB database in UWP app

    I never tested it, but if you open the System.StartUpCopy.pas you will see that in Windows, always when your program run, it will try to copy files from ExtractFilePath(ParamStr(0)) + '\StartUp\' to TPath.GetHomePath (in windows it is AppData\Roaming\). So, you can try to put in Deployment remote path: .\StartUp\yourapp\database.sqlite3 And to load the database in runtime you can try to use TPath.GetHomePath + '\yourapp\database.sqlite3'
  7. vfbb

    Your RAD Studio 10.4 Sydney issues

    One more issue: memory leak using inline variables (just arc types, like strings, arrays and interfaces) + anonymous method. Ex: procedure TForm1.FormCreate(Sender: TObject); begin var S: string := 'Test leak'; TThread.Queue(nil, procedure() begin Showmessage(S); end); end; The report:
  8. vfbb

    10.3/10.4 Debug iOS?

    It may not be your problem but I have to inform there is a very common bug with the iOS in 10.3 (not sure in 10.4), that the break points marked is pointing to an wrong line (usually 4~5 lines before or after) from the break point marked by you. It is very common for me to mark within the scope of a method but internally delphi marked on another line that is outside the scope of the method, and when you compile your breakpoint is marked as invalid. In this case I put several breakpoints in sequence, close to the method I want.
  9. vfbb

    ZXing Delphi for 10.4

    @MikeMon I forgot that in Delphi Rio there was a bug in the android permissions and I noticed that it is still in Delphi Sydney. You have to fix the FMX.Platform.Android.pas procedure TFMXNativeActivityListener.onRequestPermissionsResult(ARequestCode: Integer; APermissions: TJavaObjectArray<JString>; AGrantResults: TJavaArray<Integer>); // ----------------------------------------------------------------------------- // [iPub - github.com/viniciusfbb] - 28/05/2020 - Delphi 10.4 // The delphi messages system isn't thread-safe and this request result can be // called in background threads {$IFDEF DELPHI_FIXES} // ------------------------------------------------------- begin TThread.Queue(nil, procedure() var MsgData: TPermissionsRequestResultData; Msg: TPermissionsRequestResultMessage; begin MsgData.RequestCode := ARequestCode; MsgData.Permissions := APermissions; MsgData.GrantResults := AGrantResults; Msg := TPermissionsRequestResultMessage.Create(MsgData); TMessageManager.DefaultManager.SendMessage(nil, Msg); end); {$ELSE} // --------------------------------------------------------------------- var MsgData: TPermissionsRequestResultData; Msg: TPermissionsRequestResultMessage; begin MsgData.RequestCode := ARequestCode; MsgData.Permissions := APermissions; MsgData.GrantResults := AGrantResults; Msg := TPermissionsRequestResultMessage.Create(MsgData); TMessageManager.DefaultManager.SendMessage(nil, Msg); {$ENDIF} // -------------------------------------------------------------------- end;
  10. The Apple will remove the apps without storyboard or will not allow new updates without storyboard?
  11. vfbb

    ZXing Delphi for 10.4

    @MikeMon Today I don't have an android device to check it, but first I would check 2 things in andoird: 1) the Porject Options > Uses Permission > Camera = true. 2) Test if the "TFormMain.AccessCameraPermissionRequestResult" is executing in the main thread with LIsMainThread := TThread.Current.ThreadID = MainThreadID; About Delphi 10.3.3 I do not use anymore and the code of iOS that I posted will work only in 10.4 because the iOSapi.AVFoundation.pas of the 10.3.3 not have the apis of media permission.
  12. vfbb

    Chatbots on whatsapp. Freeware.

    The most common component of the city Recife-Brazil in the internet. @Mike Lustosa Would be better if you create a second readme in english
  13. vfbb

    ZXing Delphi for 10.4

    Mike, the "PermissionsService .RequestPermissions" works only in Android, in others platforms it have not been implemented, will simple skip. The code I gave you will work perfectly, but I think you are having trouble adapting it. So I simplified things for you: {$IFDEF iOS} type TipPermissionStatusProc = reference to procedure(AStatus: TPermissionStatus); { TipiOSUtils } TipiOSUtils = class private type { IipRequestCameraPermissionDelegate } IipRequestCameraPermissionDelegate = interface(IipInterface) procedure RequestAccessResult(AAuthorized: Boolean); end; { TipRequestCameraPermissionDelegate } TipRequestCameraPermissionDelegate = class(TipInterfacedObject, IipRequestCameraPermissionDelegate) private FStatusProc: TipPermissionStatusProc; public constructor Create(AStatusProc: TipPermissionStatusProc); procedure RequestAccessResult(AAuthorized: Boolean); end; end; uses System.Classes, FMX.Dialogs, iOSapi.AVFoundation; { TipiOSUtils.TipRequestCameraPermissionDelegate } constructor TipiOSUtils.TipRequestCameraPermissionDelegate.Create( AStatusProc: TipPermissionStatusProc); begin inherited Create; FStatusProc := AStatusProc; end; procedure TipiOSUtils.TipRequestCameraPermissionDelegate.requestAccessResult( AAuthorized: Boolean); begin if AAuthorized then FStatusProc(TPermissionStatus.Granted) else FStatusProc(TPermissionStatus.Denied); end; { TipiOSUtils } class procedure TipiOSUtils.RequestAccessResult(AAuthorized: Boolean); begin TThread.Queue(nil, procedure() var LRequestCameraPermissionDelegate: IipRequestCameraPermissionDelegate; begin LRequestCameraPermissionDelegate := FRequestCameraPermissionDelegate; FRequestCameraPermissionDelegate := nil; if Assigned(LRequestCameraPermissionDelegate) then LRequestCameraPermissionDelegate.RequestAccessResult(AAuthorized); end); end; procedure TipiOSUtils.RequestCameraPermission(AStatusProc: TipPermissionStatusProc); begin case TAVCaptureDevice.OCClass.authorizationStatusForMediaType(AVMediaTypeVideo) of AVAuthorizationStatusNotDetermined: begin FRequestCameraPermissionDelegate := TipRequestCameraPermissionDelegate.Create(AStatusProc); TAVCaptureDevice.OCClass.requestAccessForMediaType(AVMediaTypeVideo, RequestAccessResult); end; AVAuthorizationStatusDenied: AStatusProc(TPermissionStatus.Denied); AVAuthorizationStatusAuthorized: AStatusProc(TPermissionStatus.Granted); AVAuthorizationStatusRestricted: AStatusProc(TPermissionStatus.PermanentlyDenied); else AStatusProc(TPermissionStatus.Denied); end; end; {$ENDIF} And to use, replace your TFormMain.FormActivate by this: {$IFDEF iOS} var LiOSUtils: TipiOSUtils.Create; {$ENDIF} procedure TFormMain.FormActivate(Sender: TObject); begin {$IFDEF ANDROID} FPermissionCamera := JStringToString(TJManifest_permission.JavaClass.CAMERA); PermissionsService.RequestPermissions([FPermissionCamera], AccessCameraPermissionRequestResult, DisplayRationale); {$ELSEIF defined(iOS)} LiOSUtils: TipiOSUtils.Create; LiOSUtils.RequestCameraPermission( procedure(AStatus: TPermissionStatus) begin if AStatus = TPermissionStatus.Granted then CreateCamera() else Showmessage('You need to enable the Camera permission in system Settings. Please go to the Settings > MyApp > enable Camera.'); end); {$ENDIF} end; Note: To test the permission you need to unistall your app before compile.
  14. vfbb

    ZXing Delphi for 10.4

    What I doing? If the status is not determined (first time) I request the access (you can request just if the status is not determined). If is denied I simple show a message informing to go to the Settings and enable the permission manually (all aps do this, example: Telegram).
  15. vfbb

    ZXing Delphi for 10.4

    Mike, but the ZXing don't ask the permission. You need to do this by your self. I don't know why it is working for you in 10.3, probably the TCamera did it internally. I can't send you my entire code, but you will understand how it works by seeing part of the code: TipiOSUtils = class(TipFMXUtils, IipiOSUtils) private type { IipRequestCameraPermissionDelegate } IipRequestCameraPermissionDelegate = interface(IipInterface) procedure RequestAccessResult(AAuthorized: Boolean); end; { TipRequestCameraPermissionDelegate } TipRequestCameraPermissionDelegate = class(TipInterfacedObject, IipRequestCameraPermissionDelegate) private FStatusProc: TipPermissionStatusProc; public constructor Create(AStatusProc: TipPermissionStatusProc); procedure RequestAccessResult(AAuthorized: Boolean); end; {$IFDEF DELPHI_FIXES} private class var FCurrentAlert: UIAlertController; FRequestCameraPermissionDelegate: IipRequestCameraPermissionDelegate; class procedure AlertCancel(AAction: UIAlertAction); class procedure AlertSettings(AAction: UIAlertAction); class procedure RequestAccessResult(AAuthorized: Boolean); {$ENDIF} // .... {$IFDEF DELPHI_FIXES} class procedure TipiOSUtils.AlertCancel(AAction: UIAlertAction); var LRequestCameraPermissionDelegate: IipRequestCameraPermissionDelegate; begin LRequestCameraPermissionDelegate := FRequestCameraPermissionDelegate; FRequestCameraPermissionDelegate := nil; if Assigned(LRequestCameraPermissionDelegate) then LRequestCameraPermissionDelegate.RequestAccessResult(False); end; class procedure TipiOSUtils.AlertSettings(AAction: UIAlertAction); var LRequestCameraPermissionDelegate: IipRequestCameraPermissionDelegate; begin GiOSUtils.OpenAppSettings; LRequestCameraPermissionDelegate := FRequestCameraPermissionDelegate; FRequestCameraPermissionDelegate := nil; if Assigned(LRequestCameraPermissionDelegate) then LRequestCameraPermissionDelegate.RequestAccessResult(False); end; {$ENDIF} {$IFDEF DELPHI_FIXES} class procedure TipiOSUtils.RequestAccessResult(AAuthorized: Boolean); begin TipTask.Queue( procedure() var LRequestCameraPermissionDelegate: IipRequestCameraPermissionDelegate; begin LRequestCameraPermissionDelegate := FRequestCameraPermissionDelegate; FRequestCameraPermissionDelegate := nil; if Assigned(LRequestCameraPermissionDelegate) then LRequestCameraPermissionDelegate.RequestAccessResult(AAuthorized); end); end; {$ENDIF} procedure TipiOSUtils.RequestCameraPermission(const ADescription: string; AStatusProc: TipPermissionStatusProc); {$IFDEF DELPHI_FIXES} var LCancelAction: UIAlertAction; LWindow: UIWindow; {$ENDIF} begin if not Assigned(AStatusProc) then Exit; {$IFDEF DELPHI_FIXES} case TAVCaptureDevice.OCClass.authorizationStatusForMediaType(AVMediaTypeVideo) of AVAuthorizationStatusNotDetermined: begin FRequestCameraPermissionDelegate := TipRequestCameraPermissionDelegate.Create(AStatusProc); TAVCaptureDevice.OCClass.requestAccessForMediaType(AVMediaTypeVideo, RequestAccessResult); end; AVAuthorizationStatusDenied: begin LWindow := TiOSHelper.SharedApplication.keyWindow; if (LWindow = nil) or (LWindow.rootViewController = nil) then begin AStatusProc(TPermissionStatus.Denied); Exit; end; FRequestCameraPermissionDelegate := TipRequestCameraPermissionDelegate.Create(AStatusProc); FCurrentAlert := TUIAlertController.Wrap(TUIAlertController.OCClass.alertControllerWithTitle( StrToNSStr(FMXLanguage.GetPermissionTitle), StrToNSStr(ADescription + #13#10 + FMXLanguage.GetiOSPermissionMessageText), UIAlertControllerStyleAlert )); FCurrentAlert.addAction(TUIAlertAction.Wrap(TUIAlertAction.OCClass.actionWithTitle(StrToNSStr(FMXLanguage.GetPermissionSettingsButtonText), UIAlertActionStyleDefault, AlertSettings))); LCancelAction := TUIAlertAction.Wrap(TUIAlertAction.OCClass.actionWithTitle(StrToNSStr(FMXLanguage.GetPermissionCancelButtonText), UIAlertActionStyleCancel, AlertCancel)); FCurrentAlert.addAction(LCancelAction); FCurrentAlert.setPreferredAction(LCancelAction); LWindow.rootViewController.presentViewController(FCurrentAlert, True, nil); end; AVAuthorizationStatusAuthorized: AStatusProc(TPermissionStatus.Granted); AVAuthorizationStatusRestricted: AStatusProc(TPermissionStatus.PermanentlyDenied); else AStatusProc(TPermissionStatus.Denied); end; {$ELSE} AStatusProc(TPermissionStatus.Denied); {$ENDIF} end;
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