access-violation

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

问题 With c-style strings, how do you assign a char to a memory address that a character pointer points to? For example, in the example below, I want to change num to "123456", so I tried to set p to the digit where '0' is located and I try to overwrite it with '4'. Thanks. #include <stdio.h> #include <stdlib.h> int main() { char* num = (char*)malloc(100); char* p = num; num = "123056"; p = p+3; //set pointer to where '4' should be p = '4'; printf("%s\n", num ); return 0; } 回答1: That code won't

问题 With c-style strings, how do you assign a char to a memory address that a character pointer points to? For example, in the example below, I want to change num to "123456", so I tried to set p to the digit where '0' is located and I try to overwrite it with '4'. Thanks. #include <stdio.h> #include <stdlib.h> int main() { char* num = (char*)malloc(100); char* p = num; num = "123056"; p = p+3; //set pointer to where '4' should be p = '4'; printf("%s\n", num ); return 0; } 回答1: That code won't

问题 Good morning. I'm trying to learn about DLL injection, so I've wrote a little software, that just gets a String, compares with StrCmp() and if the input was equal "Winner", the software gives a Good boy message, with the porpouse of learn DLL injection. So I write a DLL that loads a Form when inject, the porpouse is using the DLL injection, to modify the Instruction of comparison( JNZ(74) to JMP(EB)), and make the software, accept any string. My DLL code is: library Project2; uses SysUtils,

问题 Currently, we use an unmanaged DLL from a vendor that allows us to access a particular instrument. The particular function of interest is specified in a header file as this: extern "C" short CCONV acq_get_board_count (); In my application, I have the pinvoke statement: public class bograms { [DllImport("bograms.dll", EntryPoint = "acq_get_board_count", CallingConvention = CallingConvention.StdCall)] public static extern short acq_get_board_count(); } Now, in my code I am attempting to handle

问题 Currently, we use an unmanaged DLL from a vendor that allows us to access a particular instrument. The particular function of interest is specified in a header file as this: extern "C" short CCONV acq_get_board_count (); In my application, I have the pinvoke statement: public class bograms { [DllImport("bograms.dll", EntryPoint = "acq_get_board_count", CallingConvention = CallingConvention.StdCall)] public static extern short acq_get_board_count(); } Now, in my code I am attempting to handle

问题 Hy everyone, here again. Continuing the code from my previous question : Is this a bad hack? memcpy with virtual classes I corrected that, using the Clone approach as suggested, but I'm having an error that also happened before I tried the memcpy thing(read question above). What I'm trying to do is to create a lambda that captures the current script and executes it, and then pass and store that lambda in an object ( Trigger*), in the member InternalCallback. I get an access violation error on

问题 I'm encountering a realy strange behaviour when using Linq in my .Net Core 2.0, ASP.Net react project: When accessing a field of an object which gets instantiated inside an Linq "Select" selector, it throws an "Access Violation Exception" Steps to reproduce (hopefully): Visual Studio 2017, 15.7.4 Create new ASP.Net Core 2.0 Project Choose "React" template alter the SampleDataController.cs as follows: [HttpGet("[action]")] public string Objects() { var rng = new Random(); var ret = Enumerable

问题 I'm getting the following exception when I run my application in Release mode from Visual C++. Unhandled Exception: System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. at _cexit() at .LanguageSupport._UninitializeDefaultDomain(Void * cookie) at .LanguageSupport.UninitializeDefaultDomain() at .LanguageSupport.DomainUnload(Object source, Eve ntArgs arguments) at .ModuleUninitializer.SingletonDomainUnload(Objec t

问题 I'm looking for common causes of Access Violation errors under .NET. Things I have checked so far - Call Dispose on all objects implementing IDisposable Check for valid arguments in calls to COM objects Explicitly remove all manually added event handlers DO NOT explicity call GC.Collect/GC.WaitForPendingFinalizers Add and Remove memory pressure when dealing with native objects (Bitmap, etc..) ( Added ) Verify all PInvoke calls for valid argument types Ensure proper use of IntPtr, SafeHandle