I am attempting to add a temporary IP address to a NIC using AddIPAddress when logged in as a non-admin user. The MSDN documentation for AddIPAddress states that ERROR_INVALID_HANDLE is returned as as error if the function is called by a non-admin user. Given that I have preceeded the call to AddIPAddress with API calls to LogonUser() a...
What is the best way to resolve the following circular dependency in typedef-ing these structs? Note the C language tag - I'm looking for a solution in standard gcc C. typedef struct { char* name; int age; int lefthanded; People* friends; } Person; typedef struct { int count; int max; Person* data; } People;...
Hi people!! I need to do a program that do this: given an image (5*5 pixels). I have to search how many images like that exists in another image, composed by many other images. That is, i need to search a given pattern in an image. The language to use is C. I have to use paralell computing, to search in the 4 angles (0º, 90º, 180º and ...
Is there a way to enumerate the members of a structure (struct | class) in C++ or C? I need to get the member name, type, and value. I've used the following sample code before on a small project where the variables were globally scoped. The problem I have now is that a set of values need to be copied from the GUI to an object, file, a...
Optimizing a game we're developing, we're running into the phase where every CPU cycle won counts. We using radians for position calculations of objects circling around other objects and I want to cut the needless accuracy in my lookup tables. For that, we make heavy use of a predefined Pi. How accurate should this Pi be? So, my questio...
What is the best implementation of Markdown for C or C++? I found these via Google, and would appreciate comments about which ones work well and which ones don't (and which ones I may have missed): peg-markdown Discount Cpp-Markdown ...
Could you recommend a good general purpose data container library for C (pure C, not C++)? I just need basic structures, like dynamic arrays, hash tables, etc. (Note: By "good" I mean fast + elegant interface). ...
Hi, If I were to program a microcontroller (ATMega128) to play a realtone with a speaker, how would I do this? Do I need to use a digital/analog converter to send different amplitude values, or is it enough with frecuency changes? In any case, how would I encode the frecuency/amplitude values that the speaker needs to receive? Do I need ...
What's the difference between: char * const and const char * ? UPDATE: char * const instead of const * char ...
Can someone show me a really simple Python ctypes example involving Unicode strings including the C code? Say, a way to take a Python Unicode string and pass it to a C function which catenates it with itself and returns that to Python, which prints it. ...
If I have a union, C standard guarantees that the union itself will be aligned to the size of the largest element. union U { long l; int i; short s; char c[2]; } u; But what does it say about alignment of individual union elements inside the union? Is the following expression guaranteed to be true? (&u.l == &u.i) && (...
Hi all I am facing a strange problem. I am using sprintf or swprintf according to the build defines with or without unicode. I have wrapped these functions in my own function like this: int mysprintf( MCHAR* str,size_t size, const MCHAR* format, ... ) { #ifdef MYUNICODE return swprintf( str, size, format); #else return snprintf...
I'm writing a recursive function that takes a char array, which represents a number, and a pointer to a digit in that array. The point of the function is to increment the number just like the ++ operator. However, when I try it out on the number '819'. It doesn't increment it to '820' but instead changes it to '810' (it increments the...
Anyone know of a script to get a listing that will be able to tell me the most frequently called functions for a C project? method1 391 method2 23 method3 12 Even better have it be customizable to require a keyword in the method name "get". I'm trying not to reinvent the wheel and write a simple script to do it myself. Probably an ea...
hi, I am in a big problem ..i have compiled my c files using linux make file in Linux OS. I want to compile the same files in Windows using the same make file by command prompt. For that i have nmake utility and Cygwin utility too. I have done that successfully with simple programs with simple make file .. But it is not possible to c...
If I got a file descriptor (socket fd), how to check this fd is avaiable for read/write? In my situation, the client has connected to server and we know the fd. However, the server will disconnect the socket, are there any clues to check it ? ...
Someone ask me to help them extract their pictures from a Web Shots image collection file (.WBC). I tried XnView but it did not work. How can I do this in C? ...
Pay attention carefully because this is a hell of a question ;-) I want to use template functions for generic collection actions (like search, foreach, etc.) in C while maintaining compiler static type checking. It is fairly straightforward while you're using simple callbacks like in this example: #define MAKE_FOREACH(TYPE)\ void forea...
Whenever I look at real code or example socket code in books, man pages and websites, I almost always see something like: struct sockaddr_in foo; memset(&foo, 0, sizeof foo); /* or bzero(), which POSIX marks as LEGACY, and is not in standard C */ foo.sin_port = htons(42); instead of: struct sockaddr_in foo = { 0 }; /* if at least o...
Hello, I read the example on "Passing multi-dimensional arrays in C" on this site. It is a great example using char arrays, and I learned a lot from it. I would like to do the same thing by creating a function to handle a dynamically allocated one-dimensional integer array, and after that, create another function for handling a multi-...