Hi, I have two classes declared as below: class User { public: MyMessageBox dataMsgBox; }; class MyMessageBox { public: void sendMessage(Message *msg, User *recvr); Message receiveMessage(); vector<Message> *dataMessageList; }; When I try to compile it using gcc, it gives the following error: 'MyMessageBox does not name a type'....
Hello, I have a strange problem with some code that calls WNetGetUniversalName. When I call the function I always get error 67 (ERROR_BAD_NET_NAME). But the network connection really does exist. So from the scratch. I'm writing a Windows shell extension that shall do some stuff with text files that are located on a specified network driv...
I'm having problems implementing IEnumerable<T> in my custom collection class in C++/CLI. Here is the relevant part of the code: using namespace System::Collections::Generic; ref class MyCollection : IEnumerable<MyClass^> { public: MyCollection() { } virtual IEnumerator<MyClass^>^ GetEnumerator() { return...
Hi, I have a basic WIX custom action: UINT __stdcall MyCustomAction(MSIHANDLE hInstaller) { DWORD dwSize=0; MsiGetProperty(hInstaller, TEXT("MyProperty"), TEXT(""), &dwSize); return ERROR_SUCCESS; } Added to the installer: <CustomAction Id="CustomActionId" FileKey="Cu...
I'm looking for a key exchange solution between a .NET app and an embedded device. The two endpoints have a shared secret key, making the Elliptic Curve Diffie-Hellman (ECDH) algorithm excellent for securely exchanging a master secret for the session. There is a good C++ library, crypto++, which implements ECDH and is suitable for the e...
Does it even make sense? ...
Hi For my current project in C++ / Qt I need a library (LGPL is preferred) which can calculate a spectrogram from a signal ( basically an array of doubles ). I already use Qwt for the GUI part. Any suggestions? Thanks. ...
hi, i was wondering if i am generating a number give an input and i want to then verify that the pairs are valid..would I store the result somewhere? I am not inclined to since I could run a million inputs through. Perhaps in my verification function I just call the generation function which generates the random code for a given input ...
In C++, I have a bigint class that can hold an integer of arbitrary size. I'd like to convert large float or double numbers to bigint. I have a working method, but it's a bit of a hack. I used IEEE 754 number specification to get the binary sign, mantissa and exponent of the input number. Here is the code (Sign is ignored here, that's...
Hi, I'm trying to load a WPF control in a C++/CLI application, using the HwndSource class. Here is my code : UBOOL MyWindowWrapper::Init(const HWND InParentWindowHandle) { Interop::HwndSourceParameters sourceParams( "WindowName" ); sourceParams.PositionX = 0; sourceParams.PositionY = 0; sourceParams.ParentWindow = (Int...
Hi I have big paragraph with some special characters as %1 , %2, %3 I need to know if there is any design pattern to replace those with proper values and create final paragraph. For Example: Following is my static paragraph. %1 is beautiful country , %2 is the capital of %1, %1 national language is %3. I get values of %1,%2, %3 by so...
I'm attempting to make my tooltips multiline, but I don't seem to be having much luck with it. I call CWnd::EnableTooltips() directly after creation (in this case, an edit box) and I handle the TTN_NEEDTEXT message. My tooltips display correctly, but only display as a single line. I've tried adding '\n' to the string I pass when han...
The C clock() function just returns me a zero. I tried using different types, with no improvement... Is this a good way to measure time with good precision? #include <time.h> #include <stdio.h> int main() { clock_t start, end; double cpu_time_used; char s[32]; start = clock(); printf("\nSleeping 3 seconds...\n\n"...
I'm researching Event Tracing for Windows (ETW) to allow a user-mode windows client to write out tracing information. The existing documentation is, to put it lightly, insanely incomplete. What would really help is a simple C++ example that writes out tracing messages using ETW. Does such an example exist? Is there other ETW documentatio...
I'm trying to create a utility similar to Microsoft's abandoned Super Fast User Switcher (download), which allows fast user switching without going through the Welcome screen. I have a working implementation using the undocumented WinStationConnectW API (along with WTSEnumerateSessions), but it can only switch to a user who is already l...
Yes this is not very portable, I wonder why one would want to do something like this:` char *cp ; reinterpret_cast<char *&>(a) = cp; ` and what it means? Thx ...
Hi there, i am currently implementing a simple ray tracer in c++. I have a class named OrthonormalBasis, which generates three orthogonal unit vectors from one or two specified vectors, for example: void OrthonormalBasis::init_from_u ( const Vector& u ) { Vector n(1,0,0); Vector m(0,1,0); u_ = unify(u); v_ = cross(u_,n)...
What is the name of the runtime library which implements Linux network interfaces, like sockets, tuntaps, netlink, etc...? For example when I create an UDP socket and make an ioctl call to fetch network interface info, which library actually implements that call? What are the corresponding *.so files on most linux dstirbutions? ...
I understand the troubles you can get into when you put a using declaration inside a header file, so I don't want to do that. Instead I tried to put the using (or a namespace foo =) within the class declaration, to cut down on repetitive typing within the header file. Unfortunately I get compiler errors. Seems like it would be a usefu...
Suppose i have declared subscript operators in a class char& operator[] (int index); const char operator[](int index) const; In what condition the second overload is called. Is it only called through a const object. In the following scenarios which version of operator will be called. const char res1 = nonConstObject[10]; nonCons...