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PORandom Access Violations in my code
 

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  1. PORandom Access Violations in my code
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    <p>I have been modifying, debugging, modifying, debugging (you know the drill) and I just can't figure out what is causing these Access Violations!</p> <p>The most typical one is with "<em>Read of adress 80000000</em>" in the Skype4COM.dll, however I don't suspect it is the code in there that is causing it.</p> <p>My first suspicion was that I was sending too many commands to the Skype API (through Skype4COM), but after adding some pausing logic, to make sure that Skype and the COM-object could keep up, I realized that was not it - it's still occuring!</p> <p>I am using Threads to perform this, and even without using Threads, it still provokes an AV. (I only use one thread at a time)</p> <p>Here is my Thread Execute method:</p> <pre><code>procedure TMyThread.Execute; Var I : Integer; User : PUser; ReceiverName : String; FullMessage : String; PauseEvent : TEvent; TimesToPause : Integer; iPause : Integer; J : Integer; FExit : Boolean; begin inherited; if Terminated then Exit; FreeOnTerminate := True; CoInitialize(Nil); FExit := True; UserList := TList.Create; SkypeThr := TSkype.Create(Nil); PauseEvent := TEvent.Create(True); Try try SkypeThr.Attach(10,False); Synchronize(SyncBegin); iMax := UserList.Count; Synchronize(SyncSetMax); LogID := 'N/A'; TimesToPause := Round(UserList.Count / 300); // For Loop for I := 0 to UserList.Count - 1 do begin FullMessage := sMessage; if (Trim(sFooter) &lt;&gt; '') and (bFooter) then FullMessage := FullMessage+sLineBreak+sFooter; User := PUser(UserList.Items[I]); ReceiverName := User.DisplayName; if Trim(ReceiverName) = '' then ReceiverName := User.SkypeID; FullMessage := ParseMessage(FullMessage,ReceiverName); LogId := User.SkypeID; try SkypeThr.CreateChatWith(User.SkypeID).SendMessage(FullMessage); PauseEvent.WaitFor(10); if TimesToPause &gt;= 1 then Begin for iPause := 1 to TimesToPause do begin J := iPause*300; if J = I then begin Synchronize(SyncPauseBegin); PauseEvent.WaitFor(3000); Synchronize(SyncPauseEnd); end; end; end; Except on E:Exception do begin ExErr := E.Message; ExLog := 'Sending message to user "'+User.SkypeID+'" failed: '; ExMsg := 'Error: Sending message to user "'+User.SkypeID+'" failed: '; Synchronize(Procedure Begin Log(ExMsg+ExErr+sLineBreak+' - Last logged Handle: '+LogID); if not AnsiContainsText(ExErr,'contact is disabled') then Begin ErrMsg(ExMsg+ExErr); FExit := True; End else FExit := False; End ); if FExit then Exit; end; End; iProgress := I+1; Synchronize(SyncProgress); end; // End my for loop // Except Except on E:Exception do begin ExErr := E.Message; ExLog := 'Error while broadcasting: '; ExMsg := 'An error has occured while broadcasting: '; Synchronize( Procedure Begin Log(ExMsg+ExErr); ErrMsg(ExMsg+ExErr); End ); Exit; end; end; // Fínally Finally PauseEvent.Free; FreeList; SkypeThr.Free; Synchronize(SyncFinalize); CoUninitialize; End; end; </code></pre> <p>The access violation occurs in the middle of the whole process - I know because if it was in the end, the progressbar that shows the progress would be full, and it's not, it's usually around 10-80%.</p> <p>The ErrMsg(); is basically just a MessageDlg routine, so I would not have to do all the mbOk and stuff.</p> <p>The Log(); adds the error to my Log memo.</p> <p>If you need more information, do not hesitate to ask!</p> <p>EDIT: I forgot to mention that debugging is kinda hard, because the AV is occuring on my clients PC, not mine. I will try to log every suspicious action however, by placing Log(); before/after each suspicious line.</p> <p>EDIT2: I just tested it on another buddy's PC, and his works flawlessly. I have a few testers, and it's like 50% of them that reports the AV's..</p> <p>Here's one of the madExcept logs:</p> <pre><code>date/time : 2011-03-29, 02:01:51, 590ms computer name : MTPOCKETS-PC user name : mtpockets registered owner : mtpockets operating system : Windows 7 Starter build 7600 system language : English system up time : 1 day 3 hours program up time : 3 hours 12 minutes processors : 2x Intel(R) Atom(TM) CPU N270 @ 1.60GHz physical memory : 105/1014 MB (free/total) free disk space : (C:) 100.42 GB display mode : 1024x600, 32 bit process id : $1ac8 allocated memory : 111.87 MB executable : xSky.exe exec. date/time : 2011-03-27 20:15 version : 0.9.2.448 compiled with : Delphi 2010 madExcept version : 3.0l contact name : david gilyeat contact email : admin@matriscruiser.com Reproducable : no callstack crc : $280a264a, $5b090a2b, $5b090a2b exception number : 2 exception class : EAccessViolation exception message : Access violation at address 280A264A in module 'Skype4COM.dll'. Read of address 00B5E000. main thread ($f8c): 280a264a +000 Skype4COM.dll 76cc8e97 +00a USER32.dll DispatchMessageW 75643e73 +0a4 oleaut32.dll DispCallFunc 76cc8e97 +00a USER32.dll DispatchMessageW 00550079 +11d xSky.exe Forms TApplication.ProcessMessage 005500be +00a xSky.exe Forms TApplication.HandleMessage 005503e9 +0c9 xSky.exe Forms TApplication.Run 007b3771 +085 xSky.exe xSky 49 +10 initialization 75e61192 +010 kernel32.dll BaseThreadInitThunk thread $a54: 76ea5caa +0a ntdll.dll NtWaitForMultipleObjects 75e61192 +10 kernel32.dll BaseThreadInitThunk thread $1824: 76ea5cca +000a ntdll.dll NtWaitForSingleObject 75031796 +0066 KERNELBASE.dll WaitForSingleObjectEx 75e5effe +003e kernel32.dll WaitForSingleObjectEx 75e5efad +000d kernel32.dll WaitForSingleObject 0057a8f2 +16c6 xSky.exe VirtualTrees .TBaseVirtualTree 004a1526 +0042 xSky.exe Classes ThreadProc 00406cf0 +0028 xSky.exe System 152 +0 ThreadWrapper 75e61192 +0010 kernel32.dll BaseThreadInitThunk thread $12f4: 76cc8fbd +26 USER32.dll GetMessageW 75e61192 +10 kernel32.dll BaseThreadInitThunk thread $10c8: &lt;suspended&gt; 76ea588a +00a ntdll.dll NtSetEvent 76e8fb6e +020 ntdll.dll RtlpUnWaitCriticalSection 76e8fb3f +000 ntdll.dll RtlLeaveCriticalSection 004a1d06 +11e xSky.exe Classes TThread.Synchronize 004a1dd5 +029 xSky.exe Classes TThread.Synchronize 005f2e42 +03a xSky.exe pngimage TChunkIDAT.CopyNonInterlacedRGBAlpha16 004a1526 +042 xSky.exe Classes ThreadProc 00406cf0 +028 xSky.exe System 152 +0 ThreadWrapper 75e61192 +010 kernel32.dll BaseThreadInitThunk thread $12bc: 76ea5caa +00a ntdll.dll NtWaitForMultipleObjects 7503686c +000 KERNELBASE.dll WaitForMultipleObjectsEx 75e5f145 +089 kernel32.dll WaitForMultipleObjectsEx 004a4cd6 +056 xSky.exe SyncObjs THandleObject.WaitFor 0052f368 +468 xSky.exe Controls TCustomHintShowHideThread.Execute 004a1526 +042 xSky.exe Classes ThreadProc 00406cf0 +028 xSky.exe System 152 +0 ThreadWrapper 75e61192 +010 kernel32.dll BaseThreadInitThunk thread $1da0: 76cc8fbd +26 USER32.dll GetMessageW 00466549 +0d xSky.exe madExcept CallThreadProcSafe 004665b3 +37 xSky.exe madExcept ThreadExceptFrame 75e61192 +10 kernel32.dll BaseThreadInitThunk &gt;&gt; &gt;&gt; created by thread $e24 at: 75da480b +00 SHLWAPI.dll thread $604: &lt;suspended&gt; 76ea5cca +00a ntdll.dll NtWaitForSingleObject 75031796 +066 KERNELBASE.dll WaitForSingleObjectEx 75e5effe +03e kernel32.dll WaitForSingleObjectEx 75e5efad +00d kernel32.dll WaitForSingleObject 004a1d22 +13a xSky.exe Classes TThread.Synchronize 004a1dd5 +029 xSky.exe Classes TThread.Synchronize 005f2e42 +03a xSky.exe pngimage TChunkIDAT.CopyNonInterlacedRGBAlpha16 004a1526 +042 xSky.exe Classes ThreadProc 00406cf0 +028 xSky.exe System 152 +0 ThreadWrapper 75e61192 +010 kernel32.dll BaseThreadInitThunk thread $1ee4: 76ea5cda +0a ntdll.dll NtWaitForWorkViaWorkerFactory 75e61192 +10 kernel32.dll BaseThreadInitThunk thread $ff4: &lt;priority:-1&gt; 76cc8e97 +0a USER32.dll DispatchMessageW 004a1526 +42 xSky.exe Classes ThreadProc 00406cf0 +28 xSky.exe System 152 +0 ThreadWrapper 75e61192 +10 kernel32.dll BaseThreadInitThunk thread $8ec: 76cc8fbd +26 USER32.dll GetMessageW 75e61192 +10 kernel32.dll BaseThreadInitThunk modules: 00400000 xSky.exe 0.9.2.448 C:\Program Files\xSky Software LLC\xSky 28000000 Skype4COM.dll 1.0.36.0 C:\Program Files\xSky Software LLC\xSky 66980000 mso.dll 12.0.6545.5004 C:\Program Files\Common Files\Microsoft Shared\office12 67a00000 olmapi32.dll 12.0.6550.5001 C:\Program Files\Microsoft Office\Office12 69660000 SearchFolder.dll 6.1.7600.16385 C:\Windows\system32 69c40000 NetworkExplorer.dll 6.1.7600.16385 C:\Windows\system32 6a190000 StructuredQuery.dll 7.0.7600.16587 C:\Windows\System32 6a3c0000 davclnt.dll 6.1.7600.16723 C:\Windows\System32 6a7f0000 ntlanman.dll 6.1.7600.16385 C:\Windows\System32 6abb0000 EhStorAPI.dll 6.1.7600.16385 C:\Windows\system32 6bbc0000 mlang.dll 6.1.7600.16385 C:\Windows\system32 6bf20000 ieproxy.dll 8.0.7600.16722 C:\Program Files\Internet Explorer 6d890000 ieframe.DLL 8.0.7600.16723 C:\Windows\system32 6eba0000 msls31.dll 3.10.349.0 C:\Windows\system32 6ef40000 SHDOCVW.dll 6.1.7600.16385 C:\Windows\system32 6ef70000 actxprxy.dll 6.1.7600.16385 C:\Windows\system32 6f050000 LINKINFO.dll 6.1.7600.16385 C:\Windows\system32 6f220000 MSMAPI32.DLL 12.0.6413.1000 C:\Program Files\Common Files\SYSTEM\MSMAPI\1033 6f320000 pnrpnsp.dll 6.1.7600.16385 C:\Windows\system32 6f340000 napinsp.dll 6.1.7600.16385 C:\Windows\system32 6f350000 winrnr.dll 6.1.7600.16385 C:\Windows\System32 6f3b0000 sfc_os.DLL 6.1.7600.16385 C:\Windows\system32 6f3c0000 SFC.DLL 6.1.7600.16385 C:\Windows\system32 6f4b0000 PortableDeviceApi.dll 6.1.7600.16385 C:\Windows\system32 6f840000 DAVHLPR.dll 6.1.7600.16385 C:\Windows\System32 6f8f0000 ntshrui.dll 6.1.7600.16385 C:\Windows\system32 6f9c0000 CSCDLL.dll 6.1.7600.16385 C:\Windows\System32 6f9f0000 cscui.dll 6.1.7600.16385 C:\Windows\System32 6fa60000 EhStorShell.dll 6.1.7600.16385 C:\Windows\system32 6ffa0000 msi.dll 5.0.7600.16385 C:\Windows\system32 70300000 winspool.drv 6.1.7600.16385 C:\Windows\system32 70760000 MPR.dll 6.1.7600.16385 C:\Windows\system32 70dc0000 rasadhlp.dll 6.1.7600.16385 C:\Windows\system32 70dd0000 cscapi.dll 6.1.7600.16385 C:\Windows\system32 70ee0000 drprov.dll 6.1.7600.16385 C:\Windows\System32 70ef0000 mapi32.dll 1.0.2536.0 C:\Windows\system32 70fa0000 winmm.DLL 6.1.7600.16385 C:\Windows\system32 71080000 olepro32.dll 6.1.7600.16385 C:\Windows\system32 71140000 msimg32.dll 6.1.7600.16385 C:\Windows\system32 711b0000 MSVCR80.dll 8.0.50727.4927 C:\Windows\WinSxS\x86_microsoft.vc80.crt_1fc8b3b9a1e18e3b_8.0.50727.4927_none_d08a205e442db5b5 71990000 wsock32.dll 6.1.7600.16385 C:\Windows\system32 719a0000 oleacc.dll 7.0.0.0 C:\Windows\system32 73120000 dhcpcsvc6.DLL 6.1.7600.16385 C:\Windows\system32 73130000 dhcpcsvc.DLL 6.1.7600.16385 C:\Windows\system32 731a0000 Fwpuclnt.dll 6.1.7600.16385 C:\Windows\system32 73340000 WINNSI.DLL 6.1.7600.16385 C:\Windows\system32 73350000 IPHLPAPI.DLL 6.1.7600.16385 C:\Windows\system32 734a0000 slc.dll 6.1.7600.16385 C:\Windows\system32 73570000 mssprxy.dll 7.0.7600.16385 C:\Windows\system32 73690000 NLAapi.dll 6.1.7600.16385 C:\Windows\system32 736c0000 ntmarta.dll 6.1.7600.16385 C:\Windows\system32 73720000 samcli.dll 6.1.7600.16385 C:\Windows\system32 73730000 wkscli.dll 6.1.7600.16385 C:\Windows\system32 73740000 netutils.dll 6.1.7600.16385 C:\Windows\system32 738d0000 WindowsCodecs.dll 6.1.7600.16385 C:\Windows\system32 73a30000 xmllite.dll 1.3.1000.0 C:\Windows\system32 73a60000 dwmapi.dll 6.1.7600.16385 C:\Windows\system32 73b40000 DUser.dll 6.1.7600.16385 C:\Windows\system32 73b70000 DUI70.dll 6.1.7600.16385 C:\Windows\system32 73c30000 gdiplus.dll 6.1.7600.16385 C:\Windows\WinSxS\x86_microsoft.windows.gdiplus_6595b64144ccf1df_1.1.7600.16385_none_72fc7cbf861225ca 73dc0000 uxtheme.dll 6.1.7600.16385 C:\Windows\system32 73e00000 propsys.dll 7.0.7600.16385 C:\Windows\system32 74010000 SAMLIB.dll 6.1.7600.16385 C:\Windows\system32 74050000 comctl32.dll 6.10.7600.16661 C:\Windows\WinSxS\x86_microsoft.windows.common-controls_6595b64144ccf1df_6.0.7600.16661_none_420fe3fa2b8113bd 744b0000 version.dll 6.1.7600.16385 C:\Windows\system32 74540000 wshtcpip.dll 6.1.7600.16385 C:\Windows\System32 747d0000 rsaenh.dll 6.1.7600.16385 C:\Windows\system32 748b0000 DNSAPI.dll 6.1.7600.16385 C:\Windows\system32 749e0000 wship6.dll 6.1.7600.16385 C:\Windows\System32 749f0000 mswsock.dll 6.1.7600.16385 C:\Windows\system32 74a30000 CRYPTSP.dll 6.1.7600.16385 C:\Windows\system32 74be0000 srvcli.dll 6.1.7600.16385 C:\Windows\system32 74d60000 Secur32.dll 6.1.7600.16385 C:\Windows\System32 74e90000 SspiCli.dll 6.1.7600.16385 C:\Windows\system32 74eb0000 WINSTA.dll 6.1.7600.16385 C:\Windows\System32 74ee0000 apphelp.dll 6.1.7600.16481 C:\Windows\system32 74f30000 CRYPTBASE.dll 6.1.7600.16385 C:\Windows\system32 74f40000 sxs.dll 6.1.7600.16385 C:\Windows\system32 74fd0000 RpcRtRemote.dll 6.1.7600.16385 C:\Windows\system32 74fe0000 profapi.dll 6.1.7600.16385 C:\Windows\system32 75020000 MSASN1.dll 6.1.7600.16415 C:\Windows\system32 75030000 KERNELBASE.dll 6.1.7600.16385 C:\Windows\system32 75110000 CFGMGR32.dll 6.1.7600.16385 C:\Windows\system32 75140000 DEVOBJ.dll 6.1.7600.16385 C:\Windows\system32 75160000 CRYPT32.dll 6.1.7600.16385 C:\Windows\system32 75280000 WINTRUST.dll 6.1.7600.16493 C:\Windows\system32 752b0000 urlmon.dll 8.0.7600.16723 C:\Windows\system32 753f0000 SETUPAPI.dll 6.1.7600.16385 C:\Windows\system32 75590000 USP10.dll 1.626.7600.16385 C:\Windows\system32 75630000 oleaut32.dll 6.1.7600.16567 C:\Windows\system32 756c0000 WLDAP32.dll 6.1.7600.16385 C:\Windows\system32 75710000 psapi.dll 6.1.7600.16385 C:\Windows\system32 75730000 WS2_32.dll 6.1.7600.16385 C:\Windows\system32 75770000 CLBCatQ.DLL 2001.12.8530.16385 C:\Windows\system32 75800000 msvcrt.dll 7.0.7600.16385 C:\Windows\system32 758b0000 GDI32.dll 6.1.7600.16385 C:\Windows\system32 75900000 LPK.dll 6.1.7600.16385 C:\Windows\system32 75910000 iertutil.dll 8.0.7600.16722 C:\Windows\system32 75b10000 RPCRT4.dll 6.1.7600.16385 C:\Windows\system32 75bf0000 ADVAPI32.DLL 6.1.7600.16385 C:\Windows\system32 75c90000 WININET.dll 8.0.7600.16723 C:\Windows\system32 75d90000 SHLWAPI.dll 6.1.7600.16385 C:\Windows\system32 75df0000 sechost.dll 6.1.7600.16385 C:\Windows\SYSTEM32 75e10000 kernel32.dll 6.1.7600.16481 C:\Windows\system32 75ef0000 NSI.dll 6.1.7600.16385 C:\Windows\system32 75f00000 ole32.dll 6.1.7600.16624 C:\Windows\system32 76060000 shell32.dll 6.1.7600.16644 C:\Windows\system32 76cb0000 USER32.dll 6.1.7600.16385 C:\Windows\system32 76d80000 comdlg32.dll 6.1.7600.16385 C:\Windows\system32 76e60000 ntdll.dll 6.1.7600.16695 C:\Windows\SYSTEM32 76fa0000 IMM32.DLL 6.1.7600.16385 C:\Windows\system32 76fc0000 MSCTF.dll 6.1.7600.16385 C:\Windows\system32 processes: 0000 Idle 0 0 0 0004 System 0 0 0 0100 smss.exe 0 0 0 01a4 csrss.exe 0 0 0 01d8 wininit.exe 0 0 0 01e0 csrss.exe 1 0 0 0210 services.exe 0 0 0 0230 winlogon.exe 1 0 0 023c lsass.exe 0 0 0 0244 lsm.exe 0 0 0 02b0 svchost.exe 0 0 0 02fc svchost.exe 0 0 0 0360 svchost.exe 0 0 0 039c svchost.exe 0 0 0 03bc svchost.exe 0 0 0 0408 audiodg.exe 0 0 0 0438 svchost.exe 0 0 0 0498 svchost.exe 0 0 0 0540 spoolsv.exe 0 0 0 055c svchost.exe 0 0 0 05c0 svchost.exe 0 0 0 0620 sqlservr.exe 0 0 0 06cc taskhost.exe 1 34 26 normal C:\Windows\system32 06e4 sqlbrowser.exe 0 0 0 075c sqlwriter.exe 0 0 0 07b8 Dwm.exe 1 25 9 normal C:\Windows\system32 0074 Explorer.EXE 1 414 263 normal C:\Windows 0b68 SearchIndexer.exe 0 0 0 0c40 wmpnetwk.exe 0 0 0 0a00 svchost.exe 0 0 0 16c8 taskhost.exe 1 0 0 1f34 taskmgr.exe 1 130 104 high C:\Windows\system32 0968 FlashUtil10l_ActiveX.exe 1 9 5 normal C:\Windows\system32\Macromed\Flash 1be8 Skype.exe 1 582 249 normal C:\Program Files\Skype\Phone 1f0c iexplore.exe 1 993 405 normal C:\Program Files\Internet Explorer 1b08 iexplore.exe 1 501 376 normal C:\Program Files\Internet Explorer 1480 skypePM.exe 1 463 694 normal C:\Program Files\Skype\Plugin Manager 0810 iexplore.exe 1 502 236 normal C:\Program Files\Internet Explorer 0e3c iexplore.exe 1 994 378 normal C:\Program Files\Internet Explorer 1bf0 iexplore.exe 1 496 203 normal C:\Program Files\Internet Explorer 1ac8 xSky.exe 1 407 181 normal C:\Program Files\xSky Software LLC\xSky 16b4 OUTLOOK.EXE 1 502 255 normal C:\Program Files\Microsoft Office\Office12 1b88 WINWORD.EXE 1 272 80 normal C:\Program Files\Microsoft Office\Office12 0218 iexplore.exe 1 405 190 normal C:\Program Files\Internet Explorer hardware: + Batteries - Microsoft AC Adapter - Microsoft ACPI-Compliant Control Method Battery - Microsoft Composite Battery + Computer - ACPI x86-based PC + Disk drives - ST9160412ASG ATA Device + Display adapters - Mobile Intel(R) 945 Express Chipset Family (driver 8.15.10.1930) - Mobile Intel(R) 945 Express Chipset Family (driver 8.15.10.1930) + IDE ATA/ATAPI controllers - ATA Channel 0 - ATA Channel 1 - Intel(R) ICH7-M Family Serial ATA Storage Controller - 27C4 (driver 9.1.1.1016) + Imaging devices - PC Camera + Keyboards - Standard PS/2 Keyboard + Mice and other pointing devices - PS/2 Compatible Mouse + Monitors - Generic PnP Monitor + Network adapters - 802.11n Wireless LAN Card (driver 3.0.11.0) - Realtek PCIe FE Family Controller (driver 7.6.820.2009) + Processors - Intel(R) Atom(TM) CPU N270 @ 1.60GHz - Intel(R) Atom(TM) CPU N270 @ 1.60GHz + Sound, video and game controllers - Realtek High Definition Audio (driver 6.0.1.5936) + Storage volume shadow copies - Generic volume shadow copy - Generic volume shadow copy - Generic volume shadow copy - Generic volume shadow copy - Generic volume shadow copy - Generic volume shadow copy - Generic volume shadow copy - Generic volume shadow copy - Generic volume shadow copy - Generic volume shadow copy + System devices - ACPI Fixed Feature Button - ACPI Lid - ACPI Power Button - ACPI Sleep Button - ACPI Thermal Zone - Composite Bus Enumerator - Direct memory access controller - File as Volume Driver - High Definition Audio Controller - High precision event timer - Intel(R) 82801 PCI Bridge - 2448 - Intel(R) 82802 Firmware Hub Device - Intel(R) ICH7M/U LPC Interface Controller - 27B9 (driver 9.1.1.1016) - Intel(R) N10/ICH7 Family PCI Express Root Port - 27D0 (driver 9.1.1.1016) - Intel(R) N10/ICH7 Family PCI Express Root Port - 27D2 (driver 9.1.1.1016) - Intel(R) N10/ICH7 Family PCI Express Root Port - 27D4 (driver 9.1.1.1016) - Intel(R) N10/ICH7 Family SMBus Controller - 27DA (driver 9.1.1.1016) - Microsoft ACPI-Compliant Embedded Controller - Microsoft ACPI-Compliant System - Microsoft System Management BIOS Driver - Microsoft Virtual Drive Enumerator Driver - Microsoft Windows Management Interface for ACPI - Mobile Intel(R) 945GME Express Processor to DRAM Controller - 27AC - Motherboard resources - Motherboard resources - Motherboard resources - Numeric data processor - PCI bus - Plug and Play Software Device Enumerator - Programmable interrupt controller - System CMOS/real time clock - System timer - Terminal Server Keyboard Driver - Terminal Server Mouse Driver - UMBus Enumerator - UMBus Root Bus Enumerator - Volume Manager + Universal Serial Bus controllers - Intel(R) N10/ICH7 Family USB Universal Host Controller - 27C8 (driver 9.1.1.1016) - Intel(R) N10/ICH7 Family USB Universal Host Controller - 27C9 (driver 9.1.1.1016) - Intel(R) N10/ICH7 Family USB Universal Host Controller - 27CA (driver 9.1.1.1016) - Intel(R) N10/ICH7 Family USB Universal Host Controller - 27CB (driver 9.1.1.1016) - Intel(R) N10/ICH7 Family USB2 Enhanced Host Controller - 27CC (driver 9.1.1.1016) - USB Composite Device - USB Root Hub - USB Root Hub - USB Root Hub - USB Root Hub - USB Root Hub cpu registers: eax = 0165013d ebx = 00f200d8 ecx = 002bc850 edx = 00000000 esi = 00b5dffd edi = 0b7edfb8 eip = 280a264a esp = 0012dbe8 ebp = 0012dbf0 stack dump: 0012dbe8 d8 00 f2 00 00 00 00 00 - 0c dc 12 00 0f 1d 0a 28 ...............( 0012dbf8 20 00 3c 0b 65 00 73 00 - d8 00 f2 00 6c 00 79 00 ..&lt;.e.s.....l.y. 0012dc08 b0 20 72 07 b4 20 72 07 - 71 1a 00 28 20 00 3c 0b ..r...r.q..(..&lt;. 0012dc18 de 00 f2 00 65 00 73 00 - d8 00 f2 00 e4 ff ff ff ....e.s......... 0012dc28 cc 20 72 07 98 1f 72 07 - 00 00 00 00 8c de 08 28 ..r...r........( 0012dc38 cc 20 72 07 00 00 00 00 - ff ff ff ff 0f 89 13 e7 ..r............. 0012dc48 07 00 00 00 18 0b e3 04 - 78 e9 12 00 00 00 00 00 ........x....... 0012dc58 70 dc 12 01 18 0b e3 04 - 01 02 00 00 00 00 70 07 p.............p. 0012dc68 d8 33 e0 00 10 00 00 00 - f0 00 00 00 00 00 00 00 .3.............. 0012dc78 07 00 00 00 09 02 00 00 - 00 00 80 07 45 00 52 00 ............E.R. 0012dc88 53 00 00 00 11 00 00 00 - 00 00 00 00 07 00 00 00 S............... 0012dc98 00 00 00 00 bc 7d 72 07 - 09 00 20 00 00 00 00 00 .....}r......... 0012dca8 18 dd 12 00 0c 45 cc 76 - 02 00 00 00 07 00 00 00 .....E.v........ 0012dcb8 78 5d 0f 28 eb 02 00 00 - c4 2f 0f 28 80 16 79 07 x].(...../.(..y. 0012dcc8 80 09 80 07 00 00 00 00 - c8 dc 12 00 cc dc 12 00 ................ 0012dcd8 74 0f 80 07 00 00 00 00 - d8 dc 12 00 dc dc 12 00 t............... 0012dce8 00 00 00 00 00 00 00 00 - e8 dc 12 00 ec dc 12 00 ................ 0012dcf8 30 98 c8 06 74 0f 80 07 - 03 00 00 00 74 07 15 00 0...t.......t... 0012dd08 ec 37 0f 28 00 00 00 00 - 01 00 00 00 00 00 00 00 .7.(............ 0012dd18 01 02 00 00 06 00 00 00 - 00 00 00 00 00 00 00 00 ................ disassembling: [...] 007b375d mov eax, [eax] 007b375f mov edx, [$771ba4] 007b3765 call -$26359a ($5501d0) ; Forms.TApplication.CreateForm 007b376a 49 mov eax, [$7c6900] 007b376f mov eax, [eax] 007b3771 &gt; call -$263456 ($550320) ; Forms.TApplication.Run 007b3776 jmp loc_7b377e 007b3778 52 push eax 007b3779 call -$3a500e ($40e770) ; Windows.SetForegroundWindow 007b377e 55 call -$3acbff ($406b84) ; System.@Halt0 </code></pre> <p>EDIT 3: After logging every line of code, I found that the <strong>crook</strong> is the <code>CreateChatWith.SendMessage</code> Line! What do you suggest?</p> <p>EDIT 4: Alright, by splitting the CreateChatWith, and the SendMessage, it was the <strong>SendMessage</strong> that causes it!</p> <p>Thanks!</p>
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      1. PORandom Access Violations in my code
      1. USjachguate
    2. COYou need to find out which line of code is accessing an invalid memory address. Then you need to work out why the memory address is invalid. Do you know which line of code is accessing an invalid memory address?
      singulars
      1. PORandom Access Violations in my code
      1. USDavid Heffernan
    3. COYou need to provide more information. Consider building your application with MadExcept (which I believe you can get for free), and it should provide a complete call stack with the exact line that's generating the AV.
      singulars
      1. PORandom Access Violations in my code
      1. USTim Sullivan
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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