I have just installed VC++2005 Express Ed. and I keep getting a LNK2001 error:unresolved external symbol "public: virtual void __thiscall Circle::draw(void)const " (?draw@Circle@@UBEXXZ) when building the following code: class Coord { private: int x, y; public: Coord (int i1,...more >>

OK, my K&R is about 10 years old now, I'm tring to understand the following: typedef struct { union { OPTICAL_REPORT optical; UINT8 battery_level; } shared; UINT8 combi; } AL_Struct; I;m ok with the union piece, it's either one or the oth...more >>

According to the docs, I would expect to check the result of an OpenFileDialog in a VS 2005 CLR Windows Forms application this way: if (openFileDialog1->ShowDialog()== DialogResult::OK) However, this does not work, and I have to use: if (openFileDialog1->ShowDialog()== Sy...more >>

Hello, I'm looking to teach myself managed C++. I'm trying to make a simple application. How do I import the number from a text box into a variable of data type long. in vb i would do something like dim var as long var = textbox.text and it would work. Now when i do in C++ l...more >>

I am new to vb.net. I converted VB6 project over to .net and I am receiving this error error when I try to compile. The ADODB is reference list. Reference required to assembly 'ADODB' containing the type 'ADODB.CursorLocationEnum'. Add one to your project....more >>

I am having a weird problem and I have can't figure out why it is happening. I create an OpenFileDialog and set a filename filter. When the dialog first opens, the filter works correctly, and only the files I want to see appear in the file list box. When I change the filter to one of the othe...more >>

Hi, I program a windows form application with VC++.NET, I wish to program an event which occurs when the user uses the mouse wheel in a pictureBox control. Which event should I use? And how can I program that? Thanks in advance...more >>

I tried building a c++ project in VS 2005, and about 300 warnings, all of the following nature: warning C4503: 'std::_Tree<_Traits>::_Min' : decorated name length exceeded, name was truncated File: C:\Program Files\Microsoft Visual Studio 8\VC\include\vector Line: 47 I haven't studied th...more >>

I have been looking all over the place for a method to take command line arguments and convert them to a string or wstring so i can process the data and then covert the resulting strings to LPCWSTRs. I have tryed several methods and none work. They include: the convert utilities A2W but tha...more >>

hi all, i had created a Windows NT service in VC 6.0 and i want to develop sasme thing in VC++.Net as per my Requirement. In VC 6.0 we get the Notification Like SERVICE_CONTROL_DEVICEEVENT by Registering through "RegisterDeviceNotification" and for that we r using RegisterServiceCtrlHandlerEx...more >>

Here a compiler bug of msvc 8 (14.00.50727.42): fatal error C1060: compiler is out of heap space Without the virtual inheritance it compiles fine. GCC has no problems. Code (tested with Loki 0.1.3): #include <loki/AbstractFactory.h> struct Enemy {}; struct Soldier : Enemy {}; s...more >>

Hello, Please, what is the equivalent code of if(e.Button == MouseButtons.Left) in VC++.NET Thanks in advance...more >>

I Have a workstation with AMD64 CPU’s and 6 Giga Byte RAM ,OS Windows XP 64. I have 2 problems with it: 1.I want my .NET application(VS.NET 2003 VC++7.0) to use more then 3 GByte of memory,how to do? VirtualAlloc can do it? 2.I use VS .NET 2003,it can not use more than 3GByte of memory,so I wa...more >>

I have a project (Win32 application) that I want to change to a console application. Does anyone know what to edit in which file, to implement the change? ...more >>

Dear all, what is a correct syntax for typeid inC++ CLI. Thanks. Boni void test( Object ^Value_){ if (typeid(Value)==typed (int)) // fails if (Value->GetType()=System::Int32::GetType())//fails } ...more >>

I know how to open a video capture window in the Windows API, how do you do it in dot-net? Is it encapsulated in one of the name-spaces?...more >>

For all new desktop apps is managed/CLR recommended? I.e. Native MFC/Win32 not recommended in general for new desktop apps? Speaking in general, not referring to exceptions (e.g. drivers) -- Greg McPherran www.McPherran.com...more >>

I'm looking for a way to programmtically identify if an executable image is 32 or 64 bit. I can do this from a DOS prompt using "dumpbin /headers filex.exe | find /I machine". I need to what dumpbin does to get the header of a file. What C call do I make to do that? Alternatively, if I cou...more >>

Hi, I am just starting of VC++ .Net 2005. Can someone suggest of any good books or any good websites for beginners. Thanks, -Asfar ...more >>

Dear all, I have following problem. I created a static libruary (mylib.lib). I compiled it with Multithreaded DLL runtime in release mode. Now I want to give out this library. But users who use it should be able to debug their programs (i.e. compile their programs in debug mode Multithrea...more >>

Dear all, ist it possible to have a template class or func as friend of other class: Folowing returns syntax errors template< typename T> class test{}; template< typename T> int func (Ta); class A{ friend class test; friend int func (???); } ...more >>

I am using multiple arrays to make tables of rows and columns. When using C++ I was able to manipulate texts by using cout << setw(3) << .... using directives iomanip.h and iostream.h. Now, when using managed C++, How can we do the same manipulation by with Console::Write() and...more >>

Hello, Using someting like #define WINVER 0x0500 in a header file works perfect, i.e. the preprocessor sees the definition. But I would like to set WINVER in the IDE (Properties -> C/C++ -> Preprocessor -> Preprocessor Definitions). Doing this the symbol seems not to get defined and the prepr...more >>

Please help with this bug, probably due to CRT not starting up. To recreate: In VS2005 create a new C++ "Windows Form Application" Add the line #include <atlbase.h> in stdafx.h (or anywhere else) I get the following error: --------------------------- Microsoft Visual C++ Debug Library ---...more >>

I tried but failed to implement a template class that support IEnumerator<T> interface using C++/CLI in VS 2005 Professional version. I could not figure out the proper syntax to implement the property "Current". The challange is that I need to implement two versions of the property: one of typ...more >>

Can someone help by explaining why the following class will not compile (VS2005), and what can be done to pass the function pointer to the "C" method? When I compile the following program, I get "error C2664: 'CMethod' : cannot convert parameter 1 from 'Test::DoItFn ^' to 'void (__cdecl *)(...more >>

Hi, I have had AtlTrace statements, but for file logging and debugging purposes, I wrote something similar. But when I release the code, the compiler does not 'ignore' the statements just as it does with TRACE or ATLTRACE etc statements. Is there a trick to get this behaviour? Thanks...more >>

Hi, I am new to C. How to generate an fixed-length string containing an random digits? for example string of 5 characters, the value can be 03234 or 23423 or 02343 Thanks Tran Hong Quang ...more >>

Hello all- I have some static C++ libraries that I wrote in VS2003 but which upgraded fine when i went to VS2005 Pro. In them i overload the global versions of operators new, new[], delete, and delete[]. I also use the STL and parts of boost (shared_ptr<> and weak_ptr<>) pretty heavily....more >>

VS 2005 / C++ __gc program / Converted from VS2003 i have a simple statemant in my program: if(this->txt_MediaDir->Text != "") txt_MediaDir is a standart singe line textbox. For some reason in my code this statemant ALWAYS evaluates to "True". Does anyone have any experance or idea what...more >>

VS 2005 / C++ / __gc program (converted from VS 2003) i have this code in my program: int found; String *temp; this->ofdOpen->ShowDialog(); the last line produces the folloing unhandleld exeption: An unhandled exception of type 'System.Threading.ThreadStateException' occurred in Sy...more >>

Hi Everybody, I am new to VC.NET and I need your help. I would like the array to print characters as '.'s (dots) instead of 0s as in (see below in front of //------>>>>>. I tried to use casting like this: multArray2[m,n] = int ('.'); If these are confusing. My question ...more >>

Hi, I am using VS2003.NET. When /clr option is activated, /MT(d) is automatically chosen (just as said in the doc). Can I changed that to /MD(d)? Knowing that in VS2005 /MD is chosen by default. And not forgetting the non-deterministic Mixed DLL problem under VS2003.Net The situation is ...more >>

Hi, I have to write a managed C++ wrapper around an existing, unmanaged C++ class. First tests suggested it should work, but after adding the complete unmanaged code, I get the following linker errors: LINK : error LNK2020: unresolved token (0A00001A) _CxxThrowException LINK : error LNK20...more >>

hi, I'd like to have the color of the screen's pixel which I point with the mouse cursor Please, help me Thanks in advance...more >>

Please, I have just created this site and am wondering what your opinion is from both professionals and amatures or the curious alike. Any opinions? www.integrated-dev-sol.co.uk Remove 123 from email address to reply. Anti spam and virus measure. ...more >>

Hi I need to instance a class at runtime, at runtime a can get the name in a string, i would like to know if its possible to instance the class at runtime with the name in a string. Thanks for your assistance. Ernesto Díaz ...more >>

Help! I recently upgraded my VS V6 to VS 2005 and was unable to build projects that were perfectly ok under VS V6. Where VS 2005 fails was in the linker resolving external DLLs, which are Open Source DLLs like "log4Cxx" and "Xerces C++" DLL libraries. VS 2005 converted my projects witho...more >>

I have a class like the following: using namespace System::Collections::Generics; [Serializable] public ref class StringMap : public Dictionary<String^, String^> { public: }; But when deserializing, the framework throws an exception that no default constructor could be found for cla...more >>

I have a lot of Visual c++ code, I am wondering how difficult it is to use them in c++.net, I guess it is a lot of work to do the conversion. ...more >>

Error 42 error LNK2022: metadata operation failed (8013118D) : Inconsistent layout information in duplicated types (mvl_net_info): (0x02000097). MVL_SERV.obj Hi guys, im migrating from VC 6.0 to VS2005, my app actually works under vs2005 but just as native code (no CLR support). I'm trying ...more >>

How do I disable Intellisense in VC2005? Regards, George. ...more >>

What is the convention for Command Window arguments? If I write a program called QQQ that takes one argument should I expect a user to type: QQQ arg QQQ -arg QQQ /arg or what? That is, what is the natural thing for Windows users to expect a program to looks for? Thanks ...more >>

I'm having trouble porting simple MS sample COM code from a console app to the actual DLL app for my application. The code is pasted in from a MS sample which was a console app. The code compiles and executes as desired from a console app. >From a managed DLL app, after adding additional lib...more >>

Referring to Managed: why do templates require an explicit copy constructor to be defined in order to use gcnew whereas simply declaring an object as a local (still uses managed heap of course) does not require the template to have a default constructor defined? -- Greg McPherran www.McP...more >>

Hi, I have code like this: unsigned char *buf *buf=1234567; How I detect the the size of data buf is pointing to? (In this case is 7) Thanks Tran Hong Quang...more >>

Hi, my friends, My boss asked me to use sound card to do analog to digital conversion for my application. I know when we record sound, sound card changes anolog signal to digital file. I have no idea where should I start? Do I need to write a driver for sound card? Is there any tool from Visua...more >>

My managed code needs to shuttle an unmanaged buffer between a couple unmanaged functions. I know this could be done via pin_ptr, and I understand the implications re managed heap fragmentation (I'll set it up at the start of the program and leave it). I believe that this could also be done...more >>

I need to wrap managed objects in unmanaged objects in a general manner, i.e. I need a C++ COM style object that will wrap any managed object. I expected (optimistically) to be able to declare my class as something like: class GeneralObjectWrapper : public IUnknown { public: General...more >>

Hi, I have a look on zlib source code and see declarations like this: void test_compress OF((Byte *compr, uLong comprLen, Byte *uncompr, uLong uncomprLen)); What is OF ? Thanks Tran Hong Quang...more >>