Hello , i don't how to type in mandarin . I have one question. I have one application .The compilation of program works very fine . Whenever I close my program either by clicking close button ( close()) or clicking on the X on the upper right, the following error message will appear Project raised exception class eaccess violation with message " access violation of address 004202f11 in module .exe . write of address 00 00 0000 . process stopped. use step or run to continue Please help . U may send email to me jycm2001@yahoo.com johnny yap automation software eng

Hello johnnyyap, It could be the problem that you access the memory address out of range. Try to check your codes that access array or dynamically allocated memory carefully. Sincerely, RichTop. RichTop 敬上 =====***** 把數學當工具，可以解決問題；將數學變能力，能夠發現並解決問題！ =====#####

hihi , do u mind to tell me more about this ?? thank you if u have icq or yahoo messenger , add me icq 95111907 yahoo jycm2001http://www.hugemouth.net/forum/viewforum.php?f=5&sid=e3f531838bc3675806c80158e75fd4d7

help .......... can anyone explain about this , urgent .......... beside this error message appeared , another message related to ntdll.dll appeared . the application is running in win2000 pro

Hi johnnyyap: Please post your code, and we can help you figure out where's the bug. Besides, what is the detail message about the ntdll.dll error?

Hii , thank you for your reply. I can't send you the coding , because the coding consists of alot of files and forms. I would like to ask what are the possible causes and reasons for the ntdll.dll and eaccess violation errors. This application is running on a semiconductor machine. It controls motors, mechanical parts , sensors. Previouly these errors did not occur. I'm suspecting i have done some code modification which might caused the errors, but i don't know how to debug the errors. Thank you regards johnnyyap

Hii , thank you for your reply. I can't send you the coding , because the coding consists of alot of files and forms. I would like to ask what are the possible causes and reasons for the ntdll.dll and eaccess violation errors. This application is running on a semiconductor machine. It controls motors, mechanical parts , sensors. Previouly these errors did not occur. I'm suspecting i have done some code modification which might caused the errors, but i don't know how to debug the errors. Thank you for your reply regards johnnyyap

Hii , thank you for your reply. I can't send you the coding , because the coding consists of alot of files and forms. I would like to ask what are the possible causes and reasons for the ntdll.dll and eaccess violation errors. This application is running on a semiconductor machine. It controls motors, mechanical parts , sensors. Previouly these errors did not occur. I'm suspecting i have done some code modification which might caused the errors, but i don't know how to debug the errors. Thank you for your reply regards johnnyyap

Hii , thank you for your reply. I can't send you the coding , because the coding consists of alot of files and forms. I would like to ask what are the possible causes and reasons for the ntdll.dll and eaccess violation errors. This application is running on a semiconductor machine. It controls motors, mechanical parts , sensors. Previouly these errors did not occur. I'm suspecting i have done some code modification which might caused the errors, but i don't know how to debug the errors. Thank you for your reply regards johnnyyap

Hi Johnnyyap: Seems you can't post the code, I will give you suggestion from your error message. Hope that it may help. The first error meesage told you that the address is at 004204f11. The location is in your main program file, (so the ntdll.dll is another issue) and "write of address 0" may be result from using a pointer after you have deleted it (FreeAndNil). Therefore, you should check all your pointers. Invalid access of array or dynamically allocated class is less possible in this case, (but it's still possible!) because the it will mostly write to a none-zero address. Besides, what is the error message about the ntdll.dll ? and Why don't you set the compile option to "debug"? The IDE will instantly show you the position that generates the error message. Regards Frank