Question: I have a dll that I can load in another program. Now the dll has access to all data/functions in the other program. Which technology can I use that now an external program can send data/commands to that dll, to steer the other program, or get data from it ? I mean, in the past that meant DDE, I think that was back in Windows ...
In C++ is not possible to declare a static virtual function, neither cast a non-static function to a C style function pointer. Now, I have a plain ol' C SDK that uses function pointers heavily. I have to fill a structure with several function pointers. I was planning to use an abstract class with a bunch of static pure virtual method...
I have a small VC++ application, in two pieces. The first piece contains the main functionality and is compiled as a static library. The second piece is a windows service that links to the library from piece one. I'm seeing some odd behavior caused by memory corruption. By setting data breakpoints and the like, I was able to determine...
We know that compiler generates some member functions for user-defined class if that member functions are not defined but used, isn't it. So I have this kind of code: class AA { }; void main() { AA a; AA b(a); a = b; } This code works fine. I mean no compiler error. But the following code.... class AA { int member1; ...
Like the msvcr70/msvcr80/msvcr90.dll, what's the code like to instruct the linker to link to one of them dynamically? Or has that anything to do with c/c++,but cmake? ...
class A1 { public: friend class B; } class A2 { private: friend class B; } Any difference? ...
Currently, I am working on the migration mentioned in the title line. Problem is application configuration that is kept in registry has a tree like structure, for example: X |->Y |->Z |->SomeKey someValue W |->AnotherKey anotherValue and so on. How can I model this structure in SQLite (or any other DB)? If you have experie...
I've got a few questions concerning text files,list and strings. I wonder if it is possible to put in a code which reads the text in a textfile,and then using "string line;" or something else to define each new row of the text and turn all of them into one list. So I can sort the rows, remove a row or two or even all of them or search t...
say I built an application called App1 with a lot of classes in a single project. And I decide that I want to build another project called App2 and I want to use those same classes so I decide to turn App1 into a lib file. Must I remove the WinMain function to do so or can I leave it and the compiler will ignore the winMain in the lib fi...
I need to add to compiler flags using bjam. So either I need a way to append to the existing flags -- like CXXFLAGS+=whatever using gmake -- or I need to know the currently-used value of cxxflags so I can replace it with my additions. As usual, the documentation leaves me astonished at the complexity of bjam but no closer to being able ...
hi, this is a simple OOP QT question. my app consists of main window (QMainWindow) and a table (QTableWidget). in the main window i have arguments and variables which i would like to pass to the table class, and to access methods in main widnow class from the table class, how should i do it ? mainwindow.h class MainWindow : public QMai...
Considering the positive effect of caching and data locality when searching in primary memory, I tend to use std::vector<> with std::pair<>-like key-value items and perform linear searches for both, if I know that the total amount of key-value items will never be "too large" to severely impact performance. Lately I've been in lots of si...
Hi All. I'm writing a video DMO decoder and trying to return a bitmap to the WMP renderer for display ... but WMP displays it upside down! This is the code : HBITMAP* hBmp = new HBITMAP(); int result; m_pScrRenderer->CreateFrame(hBmp, &result); ///This returns the HBITMAP handle. BITMAP bmStruct; memset(&bmStruct, 0, sizeof(BITM...
I've been reading a few gaming books. And they always prefer to create the engine as a static library over dynamic link. I am new to c++ so I am not highly knowledge when it comes to static libraries and dynamic link libraries. All I know is static libraries increase the size of your program, where DLL link libraries are loaded as you ne...
Few hours back I was fiddling with a Memory Leak issue and it turned out that I really got some basic stuff about virtual destructors wrong! Let me put explain my class design. class Base { virtual push_elements() {} }; class Derived:public Base { vector<int> x; public: void push_elements(){ for(int i=0;i <5;i++) ...
hello, i got a compile error which i do not understand. i have a h/cpp file combination that does not contain a class but just defines some utility functions. when i try to use a struct that is defined in another class i get the error: error C2027: use of undefined type 'B::C' so, stripped down to the problem, the h-file looks like thi...
Hi, I have a C++ library that should expose some system\ resource calls as callbacks from the linked application. For example: the interfacing application (which uses this library) can send socket management callback functions - send, receive, open, close etc., and the library will use this implementation in stead of the library's imple...
How can I cache an XSD schema (residing on disk) to be reused when parsing XMLs in Xerces (C++)? I would like to load the XSD schema when starting the process, then, whenever I need to parse an XML, to validate it first using this loaded schema. ...
When I convert char* to an string it gives an bad memory allocation error in 'new.cpp' . I used following method to convert char* called 'strData' and 'strOrg' to string. const char* strData = dt.data(); int length2 = dt.length(); string s1(strData); First time it work without any problem. But in the second convertion it give...
I checked out the microsoft documents. it shows how to create a static library upon creation of the project. but not necessarily on how to convert a previously made project, into a static library. So my question is, where do I go to turn my previously made project, into a static lib. so I can include it in my other projects ...