Access Violation in TMSFNCDataGrid

FNC TMS FNC UI Pack
1

Access Violation in TMSFNCDataGrid

Description

An Access Violation occurs when hovering the mouse over a `TMSFNCDataGrid` immediately after returning from another form that has been destroyed.

Steps to Reproduce

1. Click on the "ShowForm3" button.

2. Place Form3 in front of the `TTMSFNCDataGrid` to maximize the chances of reproducing the issue.

image-2
image-2975×652 11.7 KB

3. Click on "Close".

Annotations

This Access Violation is more reproducible in lower performance applications using the debugger helps lowering the performance.

When calling Application->CancelHint(), the bug does not appear.

Environment

  • IDE & Version: C++ builder 13

  • Operating System: Windows 11 pro

  • TMS Component Version: TMS FNC UI Pack v7.1.0.2

  • Framework: FMX

## Code Sample

`std::unique_ptr Unit3 =  std::make_unique(this);

Unit3->ShowModal();

Error Message

Project AvTMSfncDataGrid.exe raised exception class 0xc0000005 with message 'Access violation reading location 0xffffffffffffffff'.

Stack Trace

:00007FF643C8AF6F Fmx::Forms::TApplication::HideHint()()

:00007FF643C8AF29 Fmx::Forms::TApplication::CancelHint()()

:00007FF6440788BB System::Generics::Defaults::TDelegatedEqualityComparer__1Fmx::Tmsfncdatagridcell::TTMSFNCDataGridCellControlWrapper\*::TDelegatedEqualityComparer__1(System::DelphiInterface<System::Generics::Defaults::TEqualityComparison__1Fmx::Tmsfncdatagridcell::TTMSFNCDataGridCellControlWrapper\*>, System::DelphiInterface<System::Generics::Defaults::THasher__1Fmx::Tmsfncdatagridcell::TTMSFNCDataGridCellControlWrapper\*>)()

:00007FF644051639 Fmx::Tmsfncdatagridrenderer::TTMSFNCDataGridRenderer::HandleMouse(Fmx::Tmsfncdatagridcell::TTMSFNCDataGridMouseInfo&)()

:00007FF643D07A42 Fmx::Tmsfncdatagrid::TTMSFNCCustomDataGrid::HandleMouseMove(System::Set<System::Classes::TShiftStateItem, (System::Classes::TShiftStateItem)0, (System::Classes::TShiftStateItem)10>, float, float)()

:00007FF6440898BC Fmx::Tmsfnccustomcontrol::TTMSFNCCustomControlBase::MouseMove(System::Set<System::Classes::TShiftStateItem, (System::Classes::TShiftStateItem)0, (System::Classes::TShiftStateItem)10>, float, float)()

:00007FF643C9197C Fmx::Forms::TCommonCustomForm::MouseMove(System::Set<System::Classes::TShiftStateItem, (System::Classes::TShiftStateItem)0, (System::Classes::TShiftStateItem)10>, float, float)()

:00007FF64418A76C System::Generics::Defaults::TDelegatedEqualityComparer__1Fmx::Platform::Win::TImmManager\*::TDelegatedEqualityComparer__1(System::DelphiInterface<System::Generics::Defaults::TEqualityComparison__1Fmx::Platform::Win::TImmManager\*>, System::DelphiInterface<System::Generics::Defaults::THasher__1Fmx::Platform::Win::TImmManager\*>)()

:00007FF977F17846 CallWindowProcW()

:00007FF977F1730C CallWindowProcW()

Images

When the AV appers it shows this message:

![AVOnApp](image.png)

The embarcadero environment looks like this:

![C++ builder 13](image-1.png)

Project use for testing

AVTMSfncDataGrid.zip (12.7 KB)

2

we’ll investigate the access violation, please note in release mode the access violation does not occur can you confirm this?

3

In release mode is less likely to occur but it does occur.