Error Cannot Convert Std String Const Char
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more cannot convert std string to const char * for argument 1 about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users no suitable conversion function from std string to const char * Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each convert string to const char c++ other. Join them; it only takes a minute: Sign up How to convert std::string to const char in C++ [duplicate] up vote 2 down vote favorite 2 This question already has an answer here: How to convert a
Convert String To Const Char Arduino
std::string to const char* or char*? 7 answers I tried to research this for a bit and I can't figure out the problem Here's the code: #include #include #include void choose(); void newuser(); void admuse(); using namespace std; string x; string z; string w; void CreNeAcc(){ cout << "Enter User Name for your new account\n"; getline(cin, x); cout << "Enter Password for your new account\n"; getline(cin, z); cout << "Would you like the account cannot convert 'string' to 'const char*' arduino to be admin?\n"; cout << "Yes = Y, No = N\n"; getline(cin, w); choose(); } void choose(){ if(w == "Y"){ newuser(); admuse(); }else if(w == "N"){ newuser(); }else{ cout << "Invalide Command\n"; } } void newuser(){ const char* Letter_x = x.c_str(); char command [100] = "net user /add "; strcat(command, x); //This is where I get the error strcat(command, " "); strcat(commad, z); system(command); } void admuse(){ system("new localgroup administrators " << x << " /add") } also the error its giving me is: cannot convert 'std::string {aka std::basic_string}' to 'const char*' for argument '2' to 'char* strcat(char*, const char*)'| c++ string c++11 share|improve this question edited Dec 5 '13 at 2:04 Yu Hao 84.2k18116177 asked Dec 5 '13 at 2:02 Jesse Laviolette 49126 marked as duplicate by gcochard, Carey Gregory, Michael - sqlbot, Jerry Coffin, Praveen Dec 5 '13 at 6:05 This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question. 2 You already have the answer in your question... –chris Dec 5 '13 at 2:04 add a comment| 3 Answers 3 active oldest votes up vote 5 down vote In order to convert a string into an const char* use c_str(). On a side note tho: why are you using strcat in the first place? You can concatenate strings with the operat
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String To Const Char Arduino
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No Known Conversion For Argument 1 From 'string' To 'const Char*' Arduino
million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up cannot convert 'std::basic_string' to 'const char*' for argument '1' to 'int system(const char*)' up vote 5 down vote favorite http://stackoverflow.com/questions/20390008/how-to-convert-stdstring-to-const-char-in-c 2 I get this error: "invalid operands of types 'const char*' and 'const char [6]' to binary 'operator+'" when i try to compile my script. Here should be the error: string name = "john"; system(" quickscan.exe resolution 300 selectscanner jpg showui showprogress filename '"+name+".jpg'"); c++ string char system share|improve this question edited Mar 13 '15 at 17:22 BartoszKP 22.3k84167 asked Feb 5 '14 at 21:54 Giacomo Cerquone 6992917 add a comment| 5 Answers http://stackoverflow.com/questions/21589353/cannot-convert-stdbasic-stringchar-to-const-char-for-argument-1-to-i 5 active oldest votes up vote 16 down vote accepted The type of expression " quickscan.exe resolution 300 selectscanner jpg showui showprogress filename '"+name+".jpg'" is std::string. However function system has declaration int system(const char *s); that is it accepts an argumnet of type const char * There is no conversion operator that would convert implicitly an object of type std::string to object of type const char *. Nevertheless class std::string has two functions that do this conversion explicitly. They are c_str() and data() (the last can be used only with compiler that supports C++11) So you can write string name = "john"; system( (" quickscan.exe resolution 300 selectscanner jpg showui showprogress filename '"+name+".jpg'").c_str() ); There is no need to use an intermediate variable for the expression. share|improve this answer edited Feb 5 '14 at 23:20 Remy Lebeau 231k13141269 answered Feb 5 '14 at 22:09 Vlad from Moscow 1 add a comment| up vote 6 down vote std::string + const char* results in another std::string. system does not take a std::string, and you cannot concatenate char*'s with the + operator. If you want to use the code this way you will need: std::string name = "john"; std::string tmp = "quickscan.exe resolution 300 selectscanner jpg showui showprogress filename '" + name + ".jpg'"; system(tmp.c_str()); See std::string operator+(const char*) share|impr
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn http://stackoverflow.com/questions/23848669/strcmp-cannot-convert-stdstring-aka-stdbasic-stringchar-to-const-char more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack http://cboard.cprogramming.com/cplusplus-programming/74910-converting-std-string-const-char-*.html Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up strcmp cannot convert ‘std::string {aka std::basic_string}’ to ‘const char* [duplicate] up const char vote 3 down vote favorite 1 This question already has an answer here: strcmp or string::compare? 6 answers Apologies in advance for the elementary nature of the question. I am trying to use the strcmp function to test two strings for matching characters. I reduced the issue to the simple code below: #include #include using namespace std; void compareStrings(string, string); int main() { string string1 = string to const "testString", string2 = "testString"; compareStrings(string1, string2); return 0; } void compareStrings(string stringOne, string stringTwo) { if (strcmp(stringOne,stringTwo) == 0) cout << "The strings match." << endl; else cout << "The strings don't match." << endl; } Could someone explain the following compiler error message? ./newProgram.cpp: In function ‘void compareStrings(std::string, std::string)’: ./newProgram.cpp:17:32: error: cannot convert ‘std::string {aka std::basic_string}’ to ‘const char*’ for argument ‘1’ to ‘int strcmp(const char*, const char*)’ if (strcmp(stringOne,stringTwo) == 0) ^ Thanks! Xz. c++ strcmp share|improve this question edited May 25 '14 at 5:03 Jonathon Reinhart 64.5k14107180 asked May 24 '14 at 19:05 user3672337 marked as duplicate by Jonathon Reinhart, n.m., Cody Gray, πάντα ῥεῖ, ZyX May 25 '14 at 8:45 This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question. Why are you using strcmp with C++ strings? –Oliver Charlesworth May 24 '14 at 19:06 add a comment| 1 Answer 1 active oldest votes up vote 6 down vote strcmp is for C strings (null-terminated char *). string::compare is for C++ strings. If you really want to use strcmp with your std::string, you can use string::c_str() to get a pointer to the under
Programming Boards C++ Programming Converting an std::string to a const char * Getting started with C or C++ | C Tutorial | C++ Tutorial | C and C++ FAQ | Get a compiler | Fixes for common problems Thread: Converting an std::string to a const char * Thread Tools Show Printable Version Email this Page… Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode 01-24-2006 #1 Shamino View Profile View Forum Posts Absent Minded Programmer Join Date May 2005 Posts 964 Converting an std::string to a const char * I've googled, but I can't find anything really comprehensive, so I decided I'd ask you guys.. How in the world do you convert an std::string to a const char* ?/ It seems like the ifstream doesn't like working with std::string's, only const char *'s.. Helllp Sometimes I forget what I am doing when I enter a room, actually, quite often. 01-24-2006 #2 hk_mp5kpdw View Profile View Forum Posts Registered User Join Date Jan 2002 Location Northern Virginia/Washington DC Metropolitan Area Posts 3,817 Use the string's c_str() member function. [edit]There shouldn't be any problem using string containers with ifstream. Perhaps you should show a minimal code sample that is causing you problems.[/edit] "Owners of dogs will have noticed that, if you provide them with food and water and shelter and affection, they will think you are god. Whereas owners of cats are compelled to realize that, if you provide them with food and water and shelter and affection, they draw the conclusion that they are gods." -Christopher Hitchens 01-24-2006 #3 grib View Profile View Forum Posts Registered User Join Date Jan 2003 Posts 311 The getline version that works with strings is a free function Code: std::string str; std::getline(std::cin,str); Note also the the pointer returned by c_str() is only good so long as the std::string exists, and is unmodified. Thus it's fine for passing to functions, but don't try returning a c_str() from a local string and so forth. 01-24-2006 #4 Shamino View Profile View Forum Posts Absent M