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Invalid Pointer Operation Delphi

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If I delete the sentence: ptr:=Pchar('OneNationUnderGod'); then no error will occur. Checking the source code in Dialogs.pas confirms that. Application is running under windows XP OS. All rights reserved. check over here

Thread Tools Display Modes #1 06-20-2001, 12:55 AM FrankySa Member Join Date: Jan 2001 Posts: 81 Invalid Pointer operation Hi All, Here's the problem. LörAn. You say that you must use dynamically allocated PChar buffers. So, the program is trying to free an object that it already destroyed because the form Destroy event is called again. –ThN Apr 12 '12 at 15:06 1 Set some

Invalid Pointer Operation Fix

Find all posts by LörAn « Previous Thread | Next Thread » Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded If you create a component at run-time and assign it to an owner such as: Test:= TTest.Create(Form1); Then you free this component, the form will attempt to free it again at share|improve this answer edited Jan 2 '14 at 12:07 answered Jan 2 '14 at 9:34 David Heffernan 435k27592961 AFAIR in Delphi that is strcOpy ;-) and perhaps StrLCopy would Related 2Invalid pointer operation in TMonitor.Destroy0Invalid Pointer Operation + Call Stack8Invalid Pointer Operation - Delphi XE-2EInvalidPointer message with 'Invalid Pointer Operation'0Delphi 7 Invalid Pointer Operation with Custom Component1delphi invalid pointer operation0Delphi

Connect with top rated Experts 15 Experts available now in Live! That's a logic error in your program, but it would not cause the exception you're seeing. How do you keep clean on long, pre-industrial journeys? Invalid Pointer Operation Windows 10 Create(Nil) should be the correct way here. –LU RD Feb 17 '13 at 11:07 @LURD - what I do not understand is why this code is working when closing

EInvalidPointer is raised when an application attempts an invalid pointer operation. delphi pointers memory-management runtime-error share|improve this question asked Jan 2 '14 at 9:03 world peace 7218 add a comment| 3 Answers 3 active oldest votes up vote 5 down vote accepted OpenDialog1.Files.Free; share|improve this answer answered Jun 30 '09 at 17:53 Uwe Raabe 27.6k25079 Hi Uwe, I changed to 'if FileExists(OpenDialog1.Files[I]) then begin ' and I commented out this line But you must never change the value of ptr, the address of the buffer.

Answer: If you use non-Delphi threads (not using TThread or BeginThread) in a Delphi application, then you must manually set the IsMultiThread variable from the System unit to true. Invalid Pointer Operation Game Maker Please post the code which you are using to create and release your component. asked 2 years ago viewed 2623 times active 2 years ago Related 1842What are the differences between a pointer variable and a reference variable in C++?3Invalid Pointer Operation2Invalid pointer operation in Abstract: Threading in Delphi without using TThread or BeginThread, must set IsMultiThread to true.

Invalid Pointer Operation Windows 7

More social media choices: Delphi on Google+ @RADTools on Twitter Server Response from: ETNASC03 Copyright© 1994 - 2013 Embarcadero Technologies, Inc. and after releasing the form which containes my component i got the access violation and invalid pointer operation messages. Invalid Pointer Operation Fix Problem with StrCopy and StrLCopy is that typically you perform two null-terminator searches. Invalid Pointer Operation In C++ Why CSS selector with > sign (direct child) overrides default styles?

Thanks, FrankySA FrankySa View Public Profile Send a private message to FrankySa Visit FrankySa's homepage! http://clockworklaw.com/invalid-pointer/invalid-pointer-ie.php Privacy Policy Site Map Support Terms of Use Delphi Pages Forums > Delphi Forum > General Invalid Pointer operation User Name Remember Me? Is there an optional or house rule for effectiveness of specific weapons versus specific armor types? Kiel "esperantigi" Stack Exchange? / How to "esperantize" Stack Exchange? Invalid Pointer Operation Sql

current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. The debugger has detected the exception thrown by the memory manager, so do some debugging. How do you figure this one out? this content The caption of the label does show what it's supposed to, the error is the bummer.

I linked Fcoll with list of VCL (I used the Objects property in Tstringlist to maintain a list of VCL )and I create and release the child MDI form many times. What Does Invalid Pointer Operation Mean Clothes arithmetic Should I list "boredom" as a reason for leaving my previous job in an interview? Motaz 0 Message Author Comment by:asajir2002-10-13 Comment Utility Permalink(# a7330558) dear motaz, My component is visual compnent that can be dropped directly to a form.

However, it is raising because my TForm's destroy event is called more than once.

You may read documentation for functions like StrNew, StrDispose, StrCopy, StrLCopy and sample codes with those to see some patterns of working with PChar strings. Best way to remove rusted steel bolts from aluminum parts What do you call someone who acts "cool-headed"? There are three ways this can happen. Einvalidpointer OpenDialog1 has the ofAllowMultiSelect (of Options) property set to true.

It will notify the owner which removes it from its list of owned components. There could be a race condition which comes first. –LU RD Feb 17 '13 at 13:28 3 Double free is not always a runtime error. In it, you'll get: The week's top questions and answers Important community announcements Questions that need answers see an example newsletter By subscribing, you agree to the privacy policy and terms have a peek at these guys ShareMem must be also the first unit in your library's USES clause.

On the image bellow :on the left is the stack of the normal close action, on the right the stack of closing application from the taskbar menu. LörAn View Public Profile Send a private message to LörAn Visit LörAn's homepage! I read this in the comment that Borland put at the top of the dll unit. than you can perform your function by type this code The Code   (CODE) The Im… Delphi Creating an auto free string list Article by: ewangoya Creating an auto free TStringList

How to use 1. I wounder why ? Are you running with FastMM in Full Debug mode? –David Heffernan Apr 11 '12 at 20:09 @DavidHeffernan, :) I remember we had a conversation about FastMM. LörAn View Public Profile Send a private message to LörAn Visit LörAn's homepage!