access-violation

问题 We have a large application that works fine in Delphi 2006. We've moved it to XE5 and are experiencing frequent sporadic Access Violations. We're using VCL forms and a number of DevExpress and other third party components. We're working in Windows 7 Professional with Delphi XE Enterprise, Version 19.0.14356.6604. We've looked on line, here and elsewhere, for postings about A/Vs after porting to XE5 but haven't found anything that seems relevant to our problem. Here's what we know about the A

问题 I am trying to use the ctypes module to make calls to Windows' Common Item Dialog API. The code shown below is roughly based on the steps outlined in the MSDN documentation. Its only dependency is the comtypes.GUID module. import ctypes from ctypes import byref, POINTER, c_int, c_long from ctypes.wintypes import HWND, HRESULT from comtypes import GUID CLSID_FileOpenDialog = '{DC1C5A9C-E88A-4DDE-A5A1-60F82A20AEF7}' IID_IFileDialog = '{42F85136-DB7E-439C-85F1-E4075D135FC8}' #IID_IFileOpenDialog

问题 I am trying to use the ctypes module to make calls to Windows' Common Item Dialog API. The code shown below is roughly based on the steps outlined in the MSDN documentation. Its only dependency is the comtypes.GUID module. import ctypes from ctypes import byref, POINTER, c_int, c_long from ctypes.wintypes import HWND, HRESULT from comtypes import GUID CLSID_FileOpenDialog = '{DC1C5A9C-E88A-4DDE-A5A1-60F82A20AEF7}' IID_IFileDialog = '{42F85136-DB7E-439C-85F1-E4075D135FC8}' #IID_IFileOpenDialog

问题 I have passed as callback a C++ member function to a C# project through a C++/CLI wrapper (this works fine). The C# project is going to call this delegate when receiving data from another .exe process: an event will be raised and a method will call this callback. So, I needed to "save" this Action delegate using an static instance of a C# class already created. I got the following code: // C++ unmanaged function WRAPPER_API void dispatchEvent(std::function<void(int)> processEvent) { Iface:

问题 I have passed as callback a C++ member function to a C# project through a C++/CLI wrapper (this works fine). The C# project is going to call this delegate when receiving data from another .exe process: an event will be raised and a method will call this callback. So, I needed to "save" this Action delegate using an static instance of a C# class already created. I got the following code: // C++ unmanaged function WRAPPER_API void dispatchEvent(std::function<void(int)> processEvent) { Iface:

问题 Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . I've spent all day researching this, and I'm none the wiser: I have a C# DLL which PInvokes a method in a C++ DLL. I have had no problems doing this when compiling in Debug mode, but when compiling in Release mode I get an AccessViolationException. Googling this problem tells me

问题 Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . I've spent all day researching this, and I'm none the wiser: I have a C# DLL which PInvokes a method in a C++ DLL. I have had no problems doing this when compiling in Debug mode, but when compiling in Release mode I get an AccessViolationException. Googling this problem tells me

问题 I have a whole sequence of interlinked questions. I would like to know answers for all of them independantly, so *yes*, some of them appear to be X-Y questions; but I do want to know the solution to them anyway!. See end of question for list of other questions in this set. For reasons that aren't relevant to this specific question I've ended up in an event handler, triggered by a catch block in some library code. I want to know why my EventHandler triggered, but I don't seem to get told that

问题 Im trying to process a plain text file (loaded into a StringList), by using class Tbb2uc but getting AV at calling function GetAddress. TArrayQuotePositions = array[1..4] of integer; Tbb2uc = class(TObject) private Farrayquotes: TArrayQuotePositions; SlInput: TStringList; Inputfilename: TFileName; SlOutput: TStringList; function GetQuotePositions( aLine: string ): TArrayQuotePositions; function GetInvoice( aLine: string ): string; function GetName( aLine: string ): string; function GetAddress

问题 I have been having this problem for a few days now and I can find nothing on how to fix it. I have never had an error like this one : Unhandled exception at 0x00511e0e (msvcr100d.dll) in myproject.exe: 0xC0000005: Access violation writing location 0xfdfdfdfd. I really am at a loss of what to do. Any help? 回答1: 0xfdfdfdfd is a magic value in the MSVC debug heap implementation (details here) that's put as a canary directly before and behind an allocated region of storage. Somehow you're using