argv

问题 I have configuration in CMAkeLists.txt set(SOURCE_FILES client/client.cpp) add_executable(Client ${SOURCE_FILES} client/client.cpp) So I can launch client.cpp in CLion (Shift + F10). But if I need to launch client.cpp with argv parameter (it has one integer as parameter) I must change configuration in CLion adding program arguments. Maybe I can add some parameters using CMakeLists.txt? 回答1: CMakeList is only responsible for configuring your program, it does so by generating a Makefile, which

问题 This question already has answers here : constness and pointers to pointers (4 answers) non-const pointer argument to a const double pointer parameter (1 answer) Closed 5 years ago . I want to pass argv to another function, and can do it with no problems when I define the function like this: void function(char** argv); and call it from main with: function(argv); However, I would like to keep everything const where possible (I don't actually plan to change argv , or the value of either of the

问题 I am studying Python as a novice programmer. I have seen argv, as in sys.argv used and I believe it is used in other languages as well. What is the significance of the 'v' in 'argv'? What does it stand for and where does the term originate? I am hoping this will help me understand and remember the use of "argv". 回答1: The variables are named argc ( argument count ) and argv ( argument vector ) by convention, from C. note that in Python there's no sys.argc . You just use len(sys.argv) as

问题 I have an std::string containing a command to be executed with execv, what is the best "C++" way to convert it to the "char *argv[]" that is required by the second parameter of execv()? To clarify: std::string cmd = "mycommand arg1 arg2"; char *cmd_argv[]; StrToArgv(cmd, cmd_argv); // how do I write this function? execv(cmd_argv[0], cmd_argv); 回答1: std::vector<char *> args; std::istringstream iss(cmd); std::string token; while(iss >> token) { char *arg = new char[token.size() + 1]; copy(token

问题 My goal is to change the path the application restarts from. I don't have access to main , but I am free to run C code via ctypes. I was able to change argv[0] in Solarios with getexecname() , that gave me a pointer to it, to which I did memcpy . I was wondering if there is a method in winapi that allows me to either find argv[0] pointer, or an API function that changed it? Thanks 回答1: on Windows, your command line is in the PEB (Process Environment Block). You probably should not modify it,

问题 So I have a program called prog.exe that starts with int main(int argc, char** argv) The parameters that I pass to it are prog.exe news-rec or prog.exe news-rec -t -p How could I configure the values of these parameters in code so that I dont have to run the program from command line. For example for prog.exe news-rec I think argc = 1 but how will I configure argv what will it be? I tried doing argv[0] = "news-rec"; but that doesn't work 回答1: Because argv[0] contains the name of the

问题 My script currently uses sys.argv to check for an input file provided to the program. I am trying to utilise argparse instead but I cant seem to get it to work. I was able to set it up and add an argument, but when I parse an argument, and print that parsed argument, I get a namespace. How can I get a string? Basically, I want to take the argument as a string, and open a file with that name. Currently, my sys.argv is: filename = sys.argv[1] f = open(filename, 'r') My argparse prints out a

问题 Consider this program: #include <stdio.h> int main(int argc, char* argv[]) { printf("%s\n", argv[1]); return 0; } I compile it like this: x86_64-w64-mingw32-gcc -o alpha alpha.c The problem is if I give it a non ASCII argument: $ ./alpha róisín r�is�n How can I write and/or compile this program such that it accepts non ASCII characters? To respond to alk: no, the program is printing wrongly. See this example: $ echo Ω | od -tx1c 0000000 ce a9 0a 316 251 \n 0000003 $ ./alpha Ω | od -tx1c

问题 This question already has answers here : When can argv[0] have null? (4 answers) Closed 2 years ago . In the data structures class that I am currently taking, we have been tasked with writing a web crawler in C++. To give us a head start, the professor provided us with a program to get the source from a given URL and a simple HTML parser to strip the tags out. The main function for this program accepts arguments and so uses argc/argv. The code used to check for the arguments is as follows: //

问题 I'm using Jython from within Java; so I have a Java setup similar to below: String scriptname="com/blah/myscript.py" PythonInterpreter interpreter = new PythonInterpreter(null, new PySystemState()); InputStream is = this.getClass().getClassLoader().getResourceAsStream(scriptname); interpreter.execfile(is); And this will (for instance) run the script below: # myscript.py: import sys if __name__=="__main__": print "hello" print sys.argv How I pass in 'commandline' arguments using this method ?