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24 Posted Topics
 | Hello All: I have been thinking to learn develop a GUI using C++. Any suggestions on where to start? (Using which development kits and etc) Thank you |
| | Hi all: In C++, what are the common usages of a copy constructor? I know construtor can be used to initilize the object, but have not heard anything about how to use a copy construtor. Thanks  |
| | Hi all: I got some questions on the following terminologies: Stackframe and heap. Can anybody give me some explainations with simple examples? Thanks |
| | Hi people: Here is a very basic question, but it has been bugging the living hell out of me. I am using Visual Studio 2005 and progamming in C. The whole program's skeleton was given to me, and NOT to be altered. There are several header files in the "header" … |
| | Re: what is malloc? [quote=playkid]ive been hearing this word but what is malloc?[/quote] Hi there: malloc is for "memory allocation". While programming, we very often need to allocate free memory for variables of unknown length, which can not be decided at the time of programming. E.g. a program prompts people's names; since each person's … |
| | Hi people: Here is my problem: Codes: (My program is in the exact order as being represented here) [CODE] void push1(CStack stk) { stk.push(1); } int main(void) { CStack mystack; printf("Stack initially: "); mystack.print(); push1(mystack); } [/CODE] As you may read from above, the push1() function does not work at … |
| | Hello: Now I am very close to the end of my work, thank you all for helping me out.:cheesy: There is one last strong hold: I need to somehow extract the defining parameters from their associated strings. Below is an example: Strings received from the server: BROADCAST "user_nickname" "blah blah …  |
| | Here is the problem: Since there was a change in the code skeleton I was given, I had to somewhat modify my already-written codes to suit that minor change. Vast majority of the codes were still the same, so created a file with the same name and copy-paste the codes …  |
| | Hi all: The function malloc returns a void* pointer, and so I need to explicitly use type cast e.g.: (struct*)malloc(sizeof(Message_from_server)); I am wondering if it is a legal expression or at least, I should give it a tag name like (struct*message_from_server)malloc(sizeof(Message_from_server)); Thanks |
| | Hi all: There are two function declarations in the header file: void sqEnqueue(const char *s); char *sqDequeue(); (no input arguments) Those function declarations can NOT be altered. I created a linked list in this sqEnqueue function, which has the a "first" and a "last" at the head and the end … |
| | Hi all: I am stuck in the middle of my programme, wishing you may help. I am writing a "quene" structure in C, and it will copy the content of a string received from a server and display it on the client monitor. Codes: [code]typedef struct Message_from_server message_from_server void sqInitialise() … |
| | Codes: #define MAX_BUFFER_SIZE 1000 int ch = 0, alpha [25] = {0}, buffer[MAX_BUFFER_SIZE] = {0} ,count = 0; .... while ((ch = (fgetc(stream)))!=EOF) { buffer [count] = ch; count++; } printf("%d", alpha [25]); ..... The problem is: alpha [25] contains buffer [0], (alpha[25] is supposed to be 0). which suggests …  |
| | Hi all: Got a formatting question here: Trying to send data string over to a server via send(); The problem is that I want to enclose the data string with double-quotes, "data string" should be displayed on the server side. The method I used is using two double_quotes on each … |
| | :sad: Codes: if (sock!=INVALID_SOCKET) { if(send(sock,s,(int)strlen(s),0)==SOCKET_ERROR) { WSAGetLastError(); } } s is a char pointer pointing to the very first memory location of the data string. While in debugging mode, there was no error from `WSAGetLastError()`, but the data string was not displayed in the server. Why? Thanks |
| | Hi all: Just want to confirm the process that I employed to use this "critical section" feature of Microsoft Visual Studio is correct. Say, there are two processes that I want to protect. Codes: while(1st process is active) { InitializeCriticalSection(&cs); EnterCriticalSection(&cs); Do something; LeaveCriticalSection(&cs); [B]DeleteCriticalSection(&cs);[/B] } while (2nd process is … |
| | Hi all: Say, my program is about to receive a string "ABC", and I want to test if the string really contains "ABC". What is the best way to test it? I am thinking of read all the characters from the incoming string one by one, but not sure which … |
| | Hi all: According to the library, recv() will return a zero if the socket is closed, and a SOCKET_ERROR if the socket meets an error. But when I closed my socket (at least I think I closed it properly), recv() returned a SOCKET_ERROR other than zero. Wondering why? Thank you … |
| | Hi all: I have successfully opened a socket to a server and trying to send some data vai the send() function. But what surprised me is: [URL="http://www.daniweb.com/techtalkforums/wsagetlasterror_2.htm"][B]WSAGetLastError[/B][/URL]() returns nothing, which means the data has been sent to the server, however all the data (a string) will only be displayed at … |
| | Hi all: I wrote a simple program to open a socket to localhost port 8201. Codes: ...... [CODE]if (WSAStartup(VERSION, &wsadata) != NO_ERROR) { WSACleanup(); return EXIT_FAILURE; } open_socket(serverName, port); SOCKET open_socket (const char *serverName, const int port) { struct hostent *server = NULL; SOCKADDR_IN serverAddress; sock = socket(AF_INET, SOCK_STREAM, 0); … |
| | Hi guys: I have a very strange problem here. Under Linux Mandriva Powerpack 2006, KDE I "make" the program I wrote successfully in the terminal, without any errors. And I could see there was an executable file generated in the same folder. But when I typed in the program name, …  |
| | Hi all: Try to do some programming under Linux. The programme I am writing is supposed to read all the char from a file via "command in line argument (i.e. agv[i])" and via redirection (i.e. read <FILE_NAME. In my program, I have written: FILE *stream; stream = fopen(argv[i],"r"); if (stream==NULL) … |
| | Hello all: I successfully use `(int)i=fgetc(stream)` to read data from a file. But the problem is: All the data in the file are integers, like 3 0 2 3 0 0 1. (with a space between every two integers) Code: for(i=0;(i<100)&&((n=fgetc(stream))!=EOF)&&(ch!='\n');i++) { buffer[i] = n; printf("%d=%d ",i, buffer[i]); /*For debugging … |
| | Consider a line of simple C code: fopen("C:\\project\\test1.dat","r"); it "directs" the program to the directory where it can find the file from which it will read. My question is under what circumstances, I may write fopen("test1.dat","r") instead? Does the program need to be in the same folder / directory as … |
| | A newbie here. I try to: Using MS Visual Studio 2005; Programming some simple C programs; Want to open a text file and read whatever it the file into a member of a struct. First of all, which type is this "FILE" anyway? Secondly, does the definition of "stdin" include … |
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