My VC++ application sometimes closes with an "Access violation - code c0000005" exception, right in the moment when selecting a TabPage in a windows form TabControl. This access violation occurs at below line m__mychrtPtr->raw_Import( Cfx62::FileFormat_Binary, variant1 );
Sample Tab View code
void CGraphDlg::ViewChartFXGraph(Cfx62::_ChartPtr pMyChart)
{
IStreamPtr pMyStream = NULL;
VARIANT variant1;
if ( SUCCEEDED( CreateStreamOnHGlobal( NULL, TRUE, &pMyStream ) ) )
{
V_VT( &variant1 ) = VT_STREAM;
V_UNKNOWN( &variant1 ) = pMyStream;
pMyChart->PutFileMask( (Cfx62::FileMask)( Cfx62::FileMask_All ) );
pMyChart->raw_Export( Cfx62::FileFormat_Binary, variant1 );
LARGE_INTEGER large;
ULARGE_INTEGER ularge;
large.LowPart = 0;
large.HighPart = 0;
pMyStream->Seek( large, STREAM_SEEK_SET, &ularge );
m__mychrtPtr->raw_Import( Cfx62::FileFormat_Binary, variant1 );
VariantClear(&variant1);
}
}
The faulting module seems to be a COM object (ChartFX Client Server 6.2)
Using WinDbg, I caught it on the unmanaged side, inside ChartFX.ClientServer.Core.dll (that's a COM charting component we are using)
(1068.10bc): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=0d41e770 ebx=00000001 ecx=0022dcc8 edx=0000000e esi=00000007 edi=00000012
eip=3172b8d7 esp=0022dca0 ebp=0022dcc0 iopl=0 nv up ei ng nz ac po cy
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010293
*** WARNING: Unable to verify checksum for D:\x\y\z\bin\ChartFX.ClientServer.Core.dll
*** ERROR: Symbol file could not be found. Defaulted to export symbols for D:\x\y\z\bin\ChartFX.ClientServer.Core.dll -
ChartFX_ClientServer_Core!Ordinal2826+0x41:
3172b8d7 ff30 push dword ptr [eax] ds:0023:0d41e770=????????
I have several Chart instances in several TabPages, and this usually happens while I am switching the tabs. If someone could point me to the next step I should do to find the actual cause or solution, I would be very grateful.
Thanks
Vallikumar
