access violation at address 00000000

i cannot open heidisql without getting this error.... any suggestions?

Please be more detailed - if you get an exception, please post the call stack from the exception dialog here.

I seem to be having the same issue. Here is the bug report saved:

date/time : 2010-07-20, 15:48:26, 130ms
computer name : TJTHOMPS-MOBL
user name : tjthomps
registered owner : Microsoft / Microsoft
operating system : Windows 7 x64 build 7600
system language : English
system up time : 6 days 7 hours
program up time : 4 seconds
processors : 2x Intel(R) Core(TM)2 Duo CPU T7700 @ 2.40GHz
physical memory : 1732/4031 MB (free/total)
free disk space : (C:) 111.23 GB
display mode : 1600x1200, 32 bit
process id : $b40
allocated memory : 38.39 MB
executable : heidisql.r3462.exe
exec. date/time : 2010-07-20 15:35
version : 5.1.0.3462
compiled with : Delphi 2010
madExcept version : 3.0k
callstack crc : $00000000, $d1a587d9, $d1a587d9
exception number : 1
exception class : EAccessViolation
exception message : Access violation at address 00000000. Read of address 00000000.

main thread ($1ad0):
00000000 ???
0075323b heidisql.r3462.exe mysql_connection 448 +12 TMySQLConnection.SetActive
006c9093 heidisql.r3462.exe Main 2641 +8 TMainForm.InitConnection
006ff6f5 heidisql.r3462.exe connections 206 +3 Tconnform.btnOpenClick
0054533f heidisql.r3462.exe Controls TControl.Click
004d2352 heidisql.r3462.exe StdCtrls TCustomButton.Click
004d2db8 heidisql.r3462.exe StdCtrls TCustomButton.CNCommand
00544dd4 heidisql.r3462.exe Controls TControl.WndProc
0054969c heidisql.r3462.exe Controls TWinControl.WndProc
004d2018 heidisql.r3462.exe StdCtrls TButtonControl.WndProc
005449f8 heidisql.r3462.exe Controls TControl.Perform
005497ef heidisql.r3462.exe Controls DoControlMsg
0054a257 heidisql.r3462.exe Controls TWinControl.WMCommand
0056f4b4 heidisql.r3462.exe Forms TCustomForm.WMCommand
00544dd4 heidisql.r3462.exe Controls TControl.WndProc
0054969c heidisql.r3462.exe Controls TWinControl.WndProc
0056c3bc heidisql.r3462.exe Forms TCustomForm.WndProc
00548d3c heidisql.r3462.exe Controls TWinControl.MainWndProc
0049a540 heidisql.r3462.exe Classes StdWndProc
76c80ad1 USER32.dll CallWindowProcW
00740afc heidisql.r3462.exe helpers 1507 +1 CallOld
00740c44 heidisql.r3462.exe helpers 1554 +44 SizeGripWndProc
76c7cd7c USER32.dll SendMessageW
76c80ad1 USER32.dll CallWindowProcW
0054979c heidisql.r3462.exe Controls TWinControl.DefaultHandler
00545790 heidisql.r3462.exe Controls TControl.WMLButtonUp
00544dd4 heidisql.r3462.exe Controls TControl.WndProc
0054969c heidisql.r3462.exe Controls TWinControl.WndProc
004d2018 heidisql.r3462.exe StdCtrls TButtonControl.WndProc
00548d3c heidisql.r3462.exe Controls TWinControl.MainWndProc
0049a540 heidisql.r3462.exe Classes StdWndProc
76c77df5 USER32.dll DispatchMessageW
005754bd heidisql.r3462.exe Forms TApplication.ProcessMessage
00575502 heidisql.r3462.exe Forms TApplication.HandleMessage
00570d2d heidisql.r3462.exe Forms TCustomForm.ShowModal
006c4a08 heidisql.r3462.exe Main 1567 +94 TMainForm.Startup
0079b749 heidisql.r3462.exe heidisql 67 +17 initialization
74fd3675 kernel32.dll BaseThreadInitThunk

I seem to be having the same issue. Here is the bug report saved:

date/time : 2010-07-20, 15:48:26, 130ms
computer name : TJTHOMPS-MOBL
user name : tjthomps
registered owner : Microsoft / Microsoft
operating system : Windows 7 x64 build 7600
system language : English
system up time : 6 days 7 hours
program up time : 4 seconds
processors : 2x Intel(R) Core(TM)2 Duo CPU T7700 @ 2.40GHz
physical memory : 1732/4031 MB (free/total)
free disk space : (C:) 111.23 GB
display mode : 1600x1200, 32 bit
process id : $b40
allocated memory : 38.39 MB
executable : heidisql.r3462.exe
exec. date/time : 2010-07-20 15:35
version : 5.1.0.3462
compiled with : Delphi 2010
madExcept version : 3.0k
callstack crc : $00000000, $d1a587d9, $d1a587d9
exception number : 1
exception class : EAccessViolation
exception message : Access violation at address 00000000. Read of address 00000000.

main thread ($1ad0):
00000000 ???
0075323b heidisql.r3462.exe mysql_connection 448 +12 TMySQLConnection.SetActive
006c9093 heidisql.r3462.exe Main 2641 +8 TMainForm.InitConnection
006ff6f5 heidisql.r3462.exe connections 206 +3 Tconnform.btnOpenClick
0054533f heidisql.r3462.exe Controls TControl.Click
004d2352 heidisql.r3462.exe StdCtrls TCustomButton.Click
004d2db8 heidisql.r3462.exe StdCtrls TCustomButton.CNCommand
00544dd4 heidisql.r3462.exe Controls TControl.WndProc
0054969c heidisql.r3462.exe Controls TWinControl.WndProc
004d2018 heidisql.r3462.exe StdCtrls TButtonControl.WndProc
005449f8 heidisql.r3462.exe Controls TControl.Perform
005497ef heidisql.r3462.exe Controls DoControlMsg
0054a257 heidisql.r3462.exe Controls TWinControl.WMCommand
0056f4b4 heidisql.r3462.exe Forms TCustomForm.WMCommand
00544dd4 heidisql.r3462.exe Controls TControl.WndProc
0054969c heidisql.r3462.exe Controls TWinControl.WndProc
0056c3bc heidisql.r3462.exe Forms TCustomForm.WndProc
00548d3c heidisql.r3462.exe Controls TWinControl.MainWndProc
0049a540 heidisql.r3462.exe Classes StdWndProc
76c80ad1 USER32.dll CallWindowProcW
00740afc heidisql.r3462.exe helpers 1507 +1 CallOld
00740c44 heidisql.r3462.exe helpers 1554 +44 SizeGripWndProc
76c7cd7c USER32.dll SendMessageW
76c80ad1 USER32.dll CallWindowProcW
0054979c heidisql.r3462.exe Controls TWinControl.DefaultHandler
00545790 heidisql.r3462.exe Controls TControl.WMLButtonUp
00544dd4 heidisql.r3462.exe Controls TControl.WndProc
0054969c heidisql.r3462.exe Controls TWinControl.WndProc
004d2018 heidisql.r3462.exe StdCtrls TButtonControl.WndProc
00548d3c heidisql.r3462.exe Controls TWinControl.MainWndProc
0049a540 heidisql.r3462.exe Classes StdWndProc
76c77df5 USER32.dll DispatchMessageW
005754bd heidisql.r3462.exe Forms TApplication.ProcessMessage
00575502 heidisql.r3462.exe Forms TApplication.HandleMessage
00570d2d heidisql.r3462.exe Forms TCustomForm.ShowModal
006c4a08 heidisql.r3462.exe Main 1567 +94 TMainForm.Startup
0079b749 heidisql.r3462.exe heidisql 67 +17 initialization
74fd3675 kernel32.dll BaseThreadInitThunk

You have downloaded the .exe in some folder but not in the one where you installed HeidiSQL, so it can't find the right libmysql.dll

Well that was fast. You are correct, operator error Thank you very much for the quick reply and a fantastic software tool!