51,593 Topics
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| | I'm new at C++ programming and am working on an assignment. I've managed to compile my codes alright but got an error while testing the program. The error surfaced halfway through viewing details of a linked list, where suddenly, the program started printing weird characters while the computer emit beeping … |
| | Hi guys! I am currently having trouble in the final stages of an assignment which involves linked lists and dynamic arrays. The assignment involves adding books to a library. This means that each record has a title and one or more authors. I have worked out what I think was … |
| | I am using the begininvoke and endinvoke methods in visual studio 2005. [CODE] private: System::Void button_run_Click(System::Object^ sender, System::EventArgs^ e) { AsyncCallback ^ac = gcnew AsyncCallback(&InvokeTest::Form1::delegate_function_callback); delegate_function ^df = gcnew delegate_function(this, &InvokeTest::Form1::function_to_invoke); df->BeginInvoke(ac, df); } private: delegate int delegate_function(void); public: int function_to_invoke(void) { label_status->Text = "Running"; //label_status->Text = "Stopped"; } private: …  |
| | i really need help with this code. i am writing a truss analysis program and i'm confused with my push button. in my GUI i have 2 edit boxes and a push putton, when the information is entered into the edit boxes and the push button is pressed, the truss … |
| | I have just got a laptop cooler that has 3 fans built in to it. It plugs in through the usb. What i am trying to do is make a small c++ program that is able to start and stop the usb device. It would make it a lot easier …  |
 | Following code is implementation of stacks.. but its giving two errors [code=cplusplus] # include<iostream.h> # include<conio.h> # define SIZE 20 class stack { int a[SIZE]; int top; // Top of Stack public: stack() { top=0; } int overflow() { if(top==SIZE) { return (1); } else { return (0); } } … |
| | Im currently trying to work with a program that reads raw DV and dumps each frame in the form of a PPM file. I need to read the PPM's into OpenGL Textures and display them. But that is not the problem. The program has the ability to dump all of … |
 | I have a function: void CreateCostGrid(vector<ScanPoint> &Data, int whichcol, vector<LiDARScan> &LiDARGrid); That I call like this: CreateCostGrid(TestScan.getColumn(GoodCols.at(testcol)), GoodCols.at(testcol), ModelScans); But I get this: error: initial value of reference to non-const must be an lvalue CreateCostGrid(TestScan.getColumn(GoodCols.at(testcol)), GoodCols.at(testcol), ModelScans); (There is an arrow underneath the T in TestScan, i guess indicating that …  |
 | Code Should Explain It self.. [CODE=C++]#include <iostream> using namespace std; int main() { unsigned int digit; for( digit = 0; digit < 10; digit++ ) { /* I WANT THE OUTPUT TO CARRY ON UNTIL DIGIT == 10 & OUTPUT * ** *** **** ***** ****** ******* ******** ********* ********** …  |
| | I'd imagine there is a much better way to do this... [code] vector<double> Model; //code to fill Model vector<double> V1; for(int i = StartModel; i <= EndModel; i++) V1.push_back( Model.at(i) ); [/code]  |
| | Hi, When i write any code has if else statement , and run it na error appeatrs and say that else doesn't match with if [U]or[/U] illegal else without matching if. I don't know where is the problem exctly ,and you should know that i don't put } in these … |
![Member Avatar for Run.[it]](https://static.daniweb.com/avatars/orig-avatars/avatar168980.gif){kind=avatar} | Im trying to carry out input validation on a piece of code and have come across an issue. Basically for the 1st input I used getline for the string and then for the 2nd input I use cin for the integer. I am aware you can convert the integer from … |
| | which hide text and audio please help me code : public void Hide(Stream messageStream, Stream keyStream){ byte[] waveBuffer = new byte; byte message, bit, waveByte; int messageBuffer; //receives the next byte of the message or -1 int keyByte; //distance of the next carrier sample //loop over the message, hide each … |
| | I want to do something like this [code] #include <string.h> #include <iostream> using namespace std; int main() { MyFunc("test"); return 0; } void MyFunc(const char* Filename) { cout << strcat(Filename, ".tst") << endl; } [/code] but it tells me that my const char* cannot be used where it is expecting … |
| | Please I need a site where i can download Visual c++ free. I prefer the offline version of this download. Or give me a guide line on how i can use borland c++ to create a form for my program. You can email me at [email removed] Thanks |
| | [CODE]String^ comPort = "COM" + this->RS232CommPortNum->Value; int baudRate = Convert::ToInt32(this->cbBaudRate->Value); com = gcnew SerialPort(comPort, baudRate); try { com->Open(); } catch (...) { ::MessageBox::Show("Invalid Port"); }[/CODE] How do I handle this excepion thrown when the com number is not valid? When I run the release version it has an error when … |
 | hi i'm having a problem when i use pointer to pointer i've tried my best to make this work .. but it didn't i've got a run time error! PLEASE .. Please .. please i need help :'( if any one have tutorial about how can i work with pointer … |
| | Hi friendz am new to this community and am a atudent, 1st year IT.. Do anyone know how to save the background? i.e. in word wen v open 'open' dialogue box the background behind the box is not affected. how to do this? Also i hav a problem with buffer... … |
| | How to I read in a text file ignoring the digits, just want the text in the text file Any sample code? |
| | hello, I need to retreive data from excel files into data structure in c++ using vs2005. can someone please help me at least to define the connection string? thank's in advance Lior |
| | Hi all , I have successfully written a simple program to calculate the total points scored by backs and forwards against one another in a 18 person team, but I need to safe proof it against a person entering anything other than F/f for forwards or B/b for backs , … |
| | Hello Everyone, Does anyone know any design patterns for modules meant for encoding/decoding of protocol messages. E.g. BSSMAP/LAP... We need to write encoders and decoders for BSSMAP and BSSLAP messages for our product. All the IE (information elements) are defined by standards, so we know everything abt every field in …  |
| | hi folks, i need a library to analyse references of a scientific document. the lib should be able to identify references in the full text (for instance [1], [2], ... or Author A (1995), ... Author B & C (1968), ...) and it should be able to identify the elements … |
| | Hi, just need help with this code since it doesn't process the output ip or uri address when i input some numbers. I'm working on it right now as well to see if i can find what the problem is >.< * The command line parameters will consist of a … |
| | I'm a C++ beginner. What's an easy to use (in terms of both installation and use in code) library for using MySQL in C++? Is there one that's a lot more commonly used than others? Note that I'm using MySQL 4.1.22 on GNU/Linux. I've found the following: [LIST] [*][URL="http://dev.mysql.com/doc/refman/4.1/en/cplusplus.html"]MySQL++[/URL] [*][URL="http://www.sqlapi.com/"]SQLAPI++[/URL] … |
| | hey guys. ive created this function that will delete the first element it finds in a linked list that has the value n in it. it works except when the number is the FIRST element in the list. it wont delete it, it will replace it with a 0 when … |
| | I am trying to "hear" mouse events in windows, and made a mouse hook. But I think for security reasons, every time I open Internet Explorer on any site that uses the protocol https: / /, the hook is down, and return when I leave the secure url or close … |
| | So, this is what ive got. Im trying to create a depth first search algorithm, but the problem is ive never been taught this - i dont do programming at school or uni, i try to teach myself but i need help sometimes. Im using a fairly simple iterated method … |
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| | I'm having a problem with the if loop. My program should display a warning sign and skip an incomplete a bad record the user has enter that otherwise would have been displayed in an invoice. for example: if the user enters the following 3 lines when reading purchased items o … |
| | Hi all, I am learning about RTTI, but I really don't know where the error is. Please check it out for me. #include<iostream> #include<typeinfo> using namespace std; class Base { virtual void f() {}; // make Base polymorphic // ... }; class Derived1: public Base { // ... }; class … |
| | I have this program I have to write about adding binary numbers. Here is the write up: "Defining a binary number as int binNum[8]; write a C++ function void binaryAdd(int* sum, int& cBit, const int* bin1, const int* bin2) to compute sum as the sum of the two binary numbers, … |
| | Hi, beginner here making the move from Java to C++ and having troubles (of course) with const and pass-by-reference. I'll show you the code I'm working on: Card.h: [CODE]#include <iostream> using namespace std; class Card { friend ostream& operator<<(ostream& out, const Card& c); public: Card(char aSuit, int aPower); void setSuit(char … |
| | I'm dividing integers and making it a temporary double so i can get it in a decimal. To have it with a fraction i just divide the numbers and cout the answer with the mod answer "/" num2. I want to display both the fraction and in decimal, so.. for … |
| | Hi, I am developing my program on a different machine but then I take the executable to a different machine to run. The program gets data over the serial port that I write to a file for later analysis. My problem is that when I run the program on the … |
| | Hi, I have a Timage on a panel and I want to draw a cross on the image as I move my mouse on the image. I am drawing the cross using the canvas of the image. The drawing of the mouse works fine but the problem I am encountring … |
| | I am upgrading a VC++ 6.0 project to Visual Studio 2008. It uses STL extensively. It compiles fine on Visual Studio 6, but produces the following error in VS2008: [icode]error C2440: 'initializing' : cannot convert from 'const int' to 'MyStruct *'[/icode] The error is trapped in the STL functional header … |
| | With this code I will show a message box that you can press Yes or No. What happens when pressing Yes is that a panel will be Visible. On this panel, I have a label that shows text and a progressbar that will go from Value 0-100, like the code … |
| | I am trying to write a simple "Hello World" to the console. I created an empty C++ project in Visual C++ 2008, and added this one file: [code=cplusplus] // main.cpp using namespace System; int main () { Console::WriteLine("Hello World"); return 0; } [/code] I get this error: [code] Error 1 … |
| | I am trying to learn Visual C++, particularly the GUI components, so I tried to make a simple program where a button is displayed to a frame and when the button is pressed, a cout statement is invoked which displays a message to the console saying that the button has … |
 | I'm trying to pass string as filename. I wonder if there is some smart function checking every character of string if it's alphanumeric, or belongs to group of few other character specified? Loop on every string character seems not very efficient for this. Any ideas? |
| | i am writing a code for a stack within stack...or nested stack...whatever.. in the code..and the mainstack is a stack of substack, which in turn, is a stack of integer data.. i thought of using class template for both the stacks - mainstack and substack..but am confused with how to … |
| | Guys I have this terrible problem, damn its a long story and the code is too much and the worst part is it doesnt show a thing, I have two structs and two data files, They both have the same primary key and somewhere along the way I have to …  |
| | I have a function that recives as one of the parameters a function pointer. If i want to pass a class method as that function, how do I do it? I tryed like this: [code] class C { public: SetVector( vector<UTF16> ); }; //function prototype void function( const string sToPlace, … |
| | i understand how to create a socket and assign a port to a socket. But how can i make a for loop to auto assign 21 ports to it? need some helps!!! |
 | hi friends.. i got the below error while compiling a simple .cpp pgm in microsoft visual studio->vc++.. tht vcspawn.exe file is in Microsoft Visual Studio\Common\IDE\IDE98 folder.. can anyone tell me abt this problem?do i have any prob in installation?do i have to change any configuration/settings?.. Configuration: sc1 - Win32 Debug-------------------- … |
| | I need help immediately to solve the following question: can somebody suggest how to code the following? Write functions OpenFiles and MergeAndDisplay: OpenFiles syntax: ifstream *OpenFiles(char * const fileNames[], size_t count); Parameters: fileNames - a pointer to the first element in an array representing the names of text files to … |
| | I am creating a messagebox like this. What I wonder is how it is possible to make the "Second Row" to be "centered" in the messagebox ? [code] MessageBox::Show("This Is a Message on the first row \n Second Row"); [/code] |
| | All my communication using this delegate and function are great between forms, but this thread for receiving compiles and all, but then throws this error. I have posted the important sections of my code. If you think I need more, let me know. Thanks. I am getting a Cross thread … |
| | I am wwondering when is best practice to use pointer. [CODE]class Pen{ .... }; int main(int argc, char *argv[]){ Pen myPen; Pen *myPen = new Pen; } [/CODE] These are 2 ways to create myPen object. But what's the main diff between them? When to use it as pointer and … |
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