Exception from Invoke method

Visual C++ Language

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  - 1
    - IExplorer headers catching Hi, all. Does anyone know, how to catch headers of my request, using IE Event model Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 2
    - Syntax to use pin_ptr on a multi-dimensional array? Hi, I'm trying to wrap a native function with the following parameter: nfunction(long Ustart[][2]) The corresponding wrapper function has the following signature: wfunction(array<long, 2> ustart) { // use pin_ptr to "convert" the manage array to native array // call nfunction() with the "native array" } I know how to use pin_ptr<> for single dimensional arrays but how do I use it in this case Thanks for any help! Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 3
    - Mixed Mode : Should definitions be in the headers when creating static mixed lib? Hello, I am trying to use some .NET stuffs inside already existing native C++ source pool. I experienced wierd "unresolved symbol" error and ultimately solved the problem but cannot explain why. Could anyone please tell me what I did Thank you very much, [ Problem Source Files ] MixMode.lib (static lib created with /clr) // ========= "MixMe.h" ========= #pragma once #include <string> namespace Minerva { namespace MixMode { public ref class MixMe { protected: System::Xml::XmlDocument^ _doc; public: MixMe(const std: tring& fileName); virtual ~MixMe(); }; }} // ========= "MixMe.cpp" ======== #include "MixMe.h" Minerva::MixMode::MixMe::MixMe(const std: tring& fileName) { _doc = gcnew System::Xml::XmlDocument(); } Minerva::MixMode::MixMe::~MixMe() {} "MixTool.cpp" (console app with /clr) trying to link with "MixMode.lib" #include "MixMe.h" #include <stdio.h> int main(int argc, char* argv[]) { printf("Hello, mixed mode operation...\n"); return 0; } Eventually, I am getting Error 1 error LNK2020: unresolved token (06000001) Minerva.MixMode.MixMe::.ctor MixTool.obj Error 2 error LNK2020: unresolved token (06000002) Minerva.MixMode.MixMe::~MixMe MixTool.obj Error 3 fatal error LNK1120: 2 unresolved externals G:\PROJECT\Test\MixMode\Debug\MixTool.exe [ Solved Source Files ] // Very strange why this works ... MixMode.lib (static lib created with /clr) // ========= "MixMe.h" ========= #pragma once #include <string> namespace Minerva { namespace MixMode { public ref class MixMe { protected: System::Xml::XmlDocument^ _doc; public: MixMe(const std: tring& fileName) { _doc = gcnew System::Xml::XmlDocument(); } virtual ~MixMe() {} }; }} // ========= "MixMe.cpp" ======== #include "MixMe.h" "MixTool.cpp" ==> Same as above. / Link success / Runtime Behaviour OK. Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 4
    - Error with map<string, vector<vector<string> > > I've a problem with this code: #include <iostream> #include <vector> #include <map> #include <string> using namespace std; int _tmain( int argc, _TCHAR* argv[]) { vector<string> vs; vs.push_back( "Hello" ); vector<vector<string> > vvs; vvs.push_back(vs); map<string, vector<vector<string> > > m; m[ "key" ] = vvs; // error return 0; } The compiler doesn't show errors, but when I execute it in debugging I see that m contains an error message. Does somebody know where the problem Thank you Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 5
    - Windows forms help Hello everybody i wonder if you can fill a hole in my understanding of programming windows. I am trying to develop a very basic windows forms application. I have a class called class1 and another called game. It is my understanding that the autogenerated form1.h is also a class. Maybe this is because i don't understand. Anyway from game i can declare a pointer of type class1 and access class1's data members, functions etc from a function inside game. I can also declare a pointer of type form1. However when i come to access form1's data members using this pointer it won't let me alter them it just says: error C2227: left of '->richtextbox1' must point to class/struct/union/generic typ Here is the code: //game.h #pragma once class class1; //I was told these lines make this class aware of the class form1; //other class it needs to access. class game { public: int room; form1* form1; class1* class1; game(void); public: int travel(game game); virtual ~game(void); }; //game.cpp #include "StdAfx.h" #include "game.h" game::game(void) { } game::~game(void) { } game::travel(game game) { class1->datamember =2; //this line works fine form1->richtextbox1 ="hello world"; //this dies horribly return 0; } I would be extremely grateful to anyone who could help me. Thanks Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 6
    - the system cannot find the file specified...error 2 I strongly suspect that the problem here is that the Express Edition does not come with the Platfrom SDK - so windows.h along with all the other Windows header files and libraries are not on the machine. You need to install the PSDK details are here . Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 7
    - spy++ doesn't monitor reflected messages (OCM_*)? Is it possible to use spy++ to monitor reflected messages, eg. OCM_* Or is there another tool that should be used thanks Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 8
    - Runtime libraries Thanks for that link, I think it might contain an answer for some of my problems snip... "A related problem can occur when you allocate memory (either explicitly with new or malloc , or implicitly with strdup , strstreambuf: tr , and so on) and then pass a pointer across a DLL boundary to be freed. This can cause a memory access violation or heap corruption if the DLL and its users use different copies of the CRT libraries." So I cannot create an object in the dll and pass the pointer to my application that frees this object as I understand here. Should have an other approach there then. Thanks, Chris Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 9
    - Compiler directive to allow use of deprecated items? Hello, Is anyone aware of a compiler directive that will allow me to use deprecated items Regards, Peter Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 10
    - File writing in VC++6.0 I have written a code in my Exe as follows, FILE *fp; fp=fopen("image.jpg","wb"); fwrite(pVFData,Size,1,fp); fclose(fp); The above code is working properly and i have displaying the image in image.jpg. The same code in DLL is not working properly. There is image.jpg file creating only not displaying the image. What is the reason Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 11
    - How do I compile c++ code into a EXE file einaros wrote: You should have a batch file such as "C:\Program Files\Microsoft Visual Studio 8\VC\bin\vcvars32.bat", which initializes all environment variables you need to compile your source file(s) such as Bite Qiu proposes. Isn't that the old way In VS 2005 I have a "Visual Studio Command Prompt" that apparently executes the vcvars32.bat file. My guess is that the question is asking how to create a console application rather than how to compile using a command (non-interactively). That is definitely a guess of course. Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 12
    - CFileDialog That KB article is saying that if you have: existing code which customizes these dialogs with custom templates then the code will fail as described for Windows 95. If you are not customizing CFileDialog, then ignore that KB article; it is totally irrelevant. If you are customizing CFileDialog, then you are using the new style to do that and you can ignore that KB article. That KB article is saying that existing code (code that is now many years old) that customized the old-style dialog needs to have a one-line modification in order to work properly. That one-line modification causes the dialog to use the old-style dialog, consistent with the way the old code was designed to work. That KB article is in the July 1999 edition of the MSDN and was probably a few years old then. Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 13
    - textBox - 2 questions In my opinion, in order to insert a line to the beginning of a large text, first place the cursor: textBox->SelectionStart = 0; textBox->SelectionLength = 0; Then insert the text using this: textBox->SelectedText = "New line of text\r\n"; In order to limit the number of lines to three, consider this: if( textBox->GetLineFromCharIndex(textBox->TextLength) > 3) { textBox->SelectionStart = textBox->GetFirstCharIndexFromLine(3); textBox->SelectionLength = textBox->TextLength - textBox->SelectionStart; textBox->SelectedText = ""; textBox->SelectionStart = 0; } I hope it works. Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 14
    - Printing strings of TCHAR[] into a file Hi, I'm having difficulty printing strings of TCHAR[] arrays into a file using CreateFile & WriteFile. When I try to write TEXT("1234567") to a file using WriteFile, the result looks like this in the file when opened with notepad or wordpad: 1 2 3 4 5 6 7 There is a space between every character, which makes sense since I'm using UNICODE character sets, but I don't want it to look like this when I'm writing to a file, is there a way to convert between the two character sets I've been trying to come up with a snippet of code to convert TCHAR into char, but no luck so far as the VC++ won't let me declare a variable length array and won't let me access TCHAR[] array by index. For example, I get a run-time error saying that "Access violation writing location" when I do this: myConvertFunction(TCHAR * str, int lengthOfStr) { char tempStr[lengthOfStr]; // <--------- this causes a compiler error str[1] = str[2]; //<-------------this causes a run-time Access violation error } Does anyone have any ideas for me I just want to be able to print TCHAR in UNICODE set properly into a file so that when viewed in wordpad or notepad that there are not spaces between all the characters. Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 15
    - Is it just me? Deleting handlers and functions w/VC2005 impossible Hi, I share your frustrations about doing this apparently simple task. The thread has gone quiet, did you ever figure out how to do this After a few days working with Visual Studio 2005 I have decided to revert back to MSDEV6 because it is taking too long to get used to. I simply dont have the time to spare. It looks to me as if Microsoft have deliberately changed as much as possible so that it looks new and interesting. Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 16
    - Is it possible to have dialogs in a DLL created using VC++ 6.0 Please tell me how to create a dll with dialogs using VC++ 6.0 Tag: Visual C++ Language Exception from Invoke method Visual C++
- Next
  - 1
    - Static and dyanamic linking How do i create DLL and what is the difference between Static and dyanamic linking Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 2
    - CHttpFile::SendRequest() hangs Hi all, I am using CInternetSession, CHttpConnection and CHttpFile classes to fetch the asp page. The code seems to run fine for the first time, but it hangs on the second call. here is the code i wrote:- Internet session is initialized in the constructor:- m_pSession = new CInternetSession("CHttpHelper"); CHttpConnection* pServer = NULL; CHttpFile* pFile = NULL; CString server; CString object; INTERNET_PORT port; DWORD a; DWORD dwRet; DWORD dwHttpRequestFlags =INTERNET_FLAG_DONT_CACHE; CString Page; char Buffer[512]; AfxParseURL(url, a, server, object, port); pServer = m_pSession->GetHttpConnection(server, port); pFile = pServer->OpenRequest( CHttpConnection::HTTP_VERB_GET, object, NULL, 1, NULL, NULL, dwHttpRequestFlags); if (pFile != NULL) { pFile->SendRequest(); pFile->QueryInfoStatusCode(dwRet); if (dwRet == HTTP_STATUS_OK) { int nCount = 1; while (nCount > 0) { // Read the Page in a String nCount = pFile->Read(Buffer, 511); if (nCount > 0) { Buffer[nCount] = 0; Page += Buffer; } } } } if (pFile != NULL) { pFile->Close(); delete (pFile); pFile=NULL; } if (pServer != NULL) { pServer->Close(); delete (pServer); pServer=NULL; } Thanks in advance. Note:- 1. The code runs fine when i add an AfxMessageBox("Run"); before pFile->SendRequest(). 2. It works fine with local asp page. Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 3
    - check for process availability using process-id Hi, I have a problem to check for process availability in a CRT based application. I'm using: pid = _spawnlp (_P_NOWAIT, cmd, buf->data, NULL) to start a background process and need help to check if the initialisation of the process fails. _spawnlp allready return an error if something happen during startup like cmd is missing but i want to wait for ~ 0.1 sec and just check for the pid still exists. the problem is that _cwait is blocking until the process is finished. under unix I'm using: waitpid (pid, NULL, WNOHANG) with: WNOHANG The waitpid() function will not suspend exe- cution of the calling process if status is not immediately available for one of the child processes specified by pid. how can I check I the process still exists with only the pid as argument -> thanks for help mfg Andreas Otto Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 4
    - how to GET a binary file using winsock 2 I would suggest the following sequence: Code Snippet while(true) { int retval = recv(ConnectSocket, tempbuf, sizeof(tempbuf), 0); if( retval <= 0) { break; // Connection has been closed, or error } fwrite(tempbuf, retval, 1, file); } I hope it works. Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 5
    - c++ debug: STATUS_DLL_NOT_FOUND Hi, I am learning openGL and was trying to write code to display a simple openGL window. I included 'glut.h' in my code but when I run the code (F5), no window is displayed. The output says: Debugger:: An unhandled non-continuable STATUS_DLL_NOT_FOUND exception was thrown during process load The program '[1372] 2.exe: Native' has exited with code -1073741515 (0xc0000135). The platform is VS .Net2003. Can anyone help Thanks a lot! Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 6
    - Obtaining a memory address of a variable returned by a class member function Hello, I'm having some syntax difficulties. I want to set a pointer to point to a variable like this (CTREEITEM is HTREEITEM* , and GetSelectedItem() returns a HTREEITEM) : Code Snippet CTREEITEM = &pCtrl->GetSelectedItem(); In the past, I've done something similar: Code Snippet pCtrl = &this->GetTreeCtrl(); That worked as expected, but now I'm getting the compile-time error message "C2102: '&' requires l-value". I'm at a loss as to what to do. Please advise. Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 7
    - File Handler not working It is good that you have determined that CreateFile is returning an error. It is not good that there is an error but since the program was not working it is good that you have isolated the problem. Are you also calling GetLastError You will probably determine the problem using the debugger. Be methodical; use the debugger to see what is happening. Don't guess; using the _mkdir method is unlikely to fix the problem. There is probably a problem with backslashes. Perhaps there is not a backslash between the directory and the filename. That is why I say to use the debugger. I doubt that the spaces in the strings to initialize them is the problem. I assume they will be overwritten by the new data read in. Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 8
    - Makefile project linking broken in Visual Studio 2005? In Visual Studio 2003 and earlier, you could make Visual Studio projects link against the output of a makefile project by setting the Output line. In VS2005 this seems to be broken. Is there something you have to do to get this to work One of the projects I have run into has a work around for this issue by making a separate library project with no files in it, that depends on the makefile project. To get the output of the makefile project to link in, it adds the output of the makefile project to the "Additional Dependencies" line in the separate empty library project. Any upstream libraries then need to depend on the empty library project instead of the makefile project. But this means you have to author 2 project files for every external library. Is there a better way to do this in VS2005 Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 9
    - whats problem with this code? msvs2005 I did a quick test with Holger's code. The compiler generates a memset to construct the temporary, followed by a rep movs instruction to fill the destination *tst. Here's a variation that only uses rep movs. The static variable lands in memory that is assumed to be initialized to zero by the compiler. (Remove static and you get code similar to Holger's). void _test(_TEST *tst) { static _TEST empty = {}; *tst = empty; tst->test3=666; } Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 10
    - Deployment and DLLs @Ramkrishna Pawar I only plan for my app to be used on Windows XP and Vista. Here are the DLLs that Dependency Walker loads... NTDLL.DLL MSCOREE.DLL KERNEL32.DLL ADVAPI32.DLL RPCRT4.DLL SHLWAPI.DLL GDI32.DLL USER32.DLL MSVCRT.DLL IMM32.DLL MSCTF.DLL LPK.DLL USP10.DLL COMCTL32.DLL MSCORWKS.DLL MSVCR80.DLL SHELL32.DLL OLE32.DLL CULTURE.DLL MSCORLIB.NI.DLL UXTHEME.DLL MSCORJIT.DLL MSVCM80.DLL MSVCM80.NI.DLL RSAENH.DLL SYSTEM.NI.DLL SYSTEM.DRAWING.NI.DLL SYSTEM.WINDOWS.FORMS.NI.DLL GDIPLUS.DLL SYSTEM.XML.NI.DLL ICONCODECSERVICE.DLL WINDOWSCODECS.DLL VERSION.DLL CLBCATQ.DLL OLEAUT32.DLL SHDOCVW.DLL USERENV.DLL SECUR32.DLL APPHELP.DLL CSCUI.DLL PROPSYS.DLL CSCDLL.DLL CSCAPI.DLL BROWSEUI.DLL DUSER.DLL TIPTSF.DLL SETUPAPI.DLL WININET.DLL NORMALIZ.DLL IERTUTIL.DLL WS2_32.DLL NSI.DLL NETWORKEXPLORER.DLL NTSHRUI.DLL NETAPI32.DLL PSAPI.DLL SLC.DLL NTMARTA.DLL WLDAP32.DLL SAMLIB.DLL MPR.DLL NTLANMAN.DLL DRPROV.DLL DAVCLNT.DLL WPDSHEXT.DLL WINMM.DLL OLEACC.DLL PORTABLEDEVICEAPI.DLL WINTRUST.DLL CRYPT32.DLL MSASN1.DLL IMAGEHLP.DLL PORTABLEDEVICETYPES.DLL AUDIODEV.DLL WMVCORE.DLL WMASF.DLL NETSHELL.DLL IPHLPAPI.DLL DHCPCSVC.DLL DNSAPI.DLL WINNSI.DLL DHCPCSVC6.DLL NLAAPI.DLL ACCESSIBILITY.NI.DLL IEFRAME.DLL URLMON.DLL @Simple Samples I don't expect deployment to solve a problem, the problem is deployment, itself. I'm asking how do I determine which DLLs need to be distributed with my app The documentation that I've read for VC++ deployment (the link you provided that says "Deployment (C++)") only states that Dependency Walker lists all required DLLs but doesn't mention how to weed out the ones that do and don't need to be redistributed with my app. I've yet to try crescens2k's suggestion because all of my PCs have Visual Studio installed, so I can't check which DLLs are missing since they already have all DLLs. However, I will find a clean computer to try out later tonight. Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 11
    - CWinFormsView VC2005 We are integrating .NET UserControls into MFC using the CWinfFormsView class. It works great except for a few things. The most important issues is TAB navigation and tooltips (running the same usercontrol on a modal WinForm works fine). TAB navigation seemingly works, but often suddenly stops working at a specific controls (running the same usercontrol on a modal WinForm works fine) Espen. Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 12
    - VS 2005 and Qt QString Peter Ritchie wrote: Could be that you're linking to a library that wasn't built for the same version of Visual Studio that you're using... another way getting a std:: string: Code Snippet std::string((const char*)qstr); How do I link to the correct library then Are you saying to just cast the QString to a char* Thanks! Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 13
    - question about backups and .ncb files I wanted to make some backups from my source but the portable backup device has limited space and copying needs long. In order to save some space I wrote a script which will delete all folders with name Debug or Relesae. I think I don`t need that folders because I can recompile my source. What about .ncb files Them are quite big. I think them have basically just some informations which speed up reloading the project. If I delete them I need more time starting my project the next time, but no informations are lost forever. Is this correct Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 14
    - Problem with NULL in visualstudio 2005 Hi All.. Thank you so much for all your help. The problem was resolved by defining _HAS_ITERATOR_DEBUGGING and _SECURE_SCL in stdafx.h as below. #ifndef _HAS_ITERATOR_DEBUGGING #define _HAS_ITERATOR_DEBUGGING 0 #endif #ifndef _SECURE_SCL #define _SECURE_SCL 0 #endif Thank you, Venu. Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 15
    - Reg 64-bit support Hi, I am relatively new to Visual C++ and require your help on this. I have C++ code which is required to run on both 32-bit and 64-bit Windows. Can I use Visual C++ 2.0 to compile the C++ code or I would need Microsoft Visual C++ 2005 to do this The http://en.wikipedia.org/wiki/Visual_C ++ says that Visual Studio 2005 Standard and Professional editions have x64 compiler support .But currently, I have only Visual C++ 2.0 . Can 64-bit compilation work with 2.0 or I necessarily have to go in for Microsoft Visual C++ 2005 Thank you very much in advance! Tag: Visual C++ Language Exception from Invoke method Visual C++
  - 16
    - Dictionary<TKey, TVal> subclasses invisible I got it, you have a spelling mistake, it's not Value s Collection, it's a ValueCollection. Tag: Visual C++ Language Exception from Invoke method Visual C++

Paul Wheatley

I'm getting the message "NULLReferenceException: Object reference not set to an instance of an object"

when executing the following:

if (this->mycontrol->InvokeRequired == true)

{

this->mycontrol->Invoke(gcnew MethodInvoker(this,&myForm::controlDelegate));

}

The exception refers to the line that calls the Invoke method.

This does not happen consistently. Most of the time there is no exception.

Any suggestions

Thanks.

Paul

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Re: Visual C++ Language Exception from Invoke method

Holger Grund

Use a debugger to see what's going on.

The first step would be to identify where exactly the exception happens. That may be less than trivial in the C++ managed debugger. However, the _full_ callstack should give you an indication of what's going on.

Taking a look at the callstack of the exception would help. You can either catch the exception in code and take a look at the stacktrace or use the managed (non-C++) debugger and take a look the pseudo register for the current exception ($exception IIRC).

-hg

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