C ++:Setenv()。 Visual Studio中未定义的标识符 [英] C++: Setenv(). Undefined identifier in Visual Studio
问题描述
错误1错误C3861:'setenv' :未找到标识符e:\users\owner\documents\visual studio 2012 \projects\project1\project1\source1.cpp 18 1 Project1
。
帮助我!!!
#include< windows.h>
#include< sstream>
#include< ostream>
#include< cstdlib>
#include< iostream>
#include< stdlib.h>
使用namespace std;
int howManyInClass = 0;
int main(){
long checklength = sizeof(getenv(classSize))/ sizeof(* getenv(classSize));
if(checklength == 0){
cout<<请输入你班上学生的总数;
cin>> howManyInClass;
cin.ignore();
setenv(classSize,howManyInClass,1);}
};
您可以使用 _putenv()
它将字符串参数作为字符串 classSize = 7
;
ostringstream classSize;
classSize<<< classSize =<< howManyInClass;
_putenv(classSize.str()。c_str());
...或(最好)安全性增强的 _putenv_s()
将键和值作为单独的(const char *)参数;
ostringstream classSize;
classSize<<< howManyInClass;
_putenv_s(classSize,classSize.str()。c_str());
Look my code seems to be correct, according to all the documentation I can find online. My IDE is MS Visual Studio Xpress 4 Windows Desktop 2012, and it's compiler is throwing up the error:
Error 1 error C3861: 'setenv': identifier not found e:\users\owner\documents\visual studio 2012\projects\project1\project1\source1.cpp 18 1 Project1
.
Help me!!!
#include <windows.h>
#include <sstream>
#include <ostream>
#include <cstdlib>
#include <iostream>
#include <stdlib.h>
using namespace std;
int howManyInClass = 0;
int main(){
long checklength = sizeof(getenv("classSize"))/sizeof(*getenv("classSize"));
if (checklength==0){
cout<<"Please enter the ammount of students in your class";
cin>> howManyInClass;
cin.ignore();
setenv("classSize", howManyInClass, 1);}
};
You can either use _putenv()
which takes a string parameter as the string classSize=7
;
ostringstream classSize;
classSize << "classSize=" << howManyInClass;
_putenv(classSize.str().c_str());
...or (preferably) the security enhanced _putenv_s()
that takes the key and the value as separate (const char*) parameters;
ostringstream classSize;
classSize << howManyInClass;
_putenv_s("classSize", classSize.str().c_str());
这篇关于C ++:Setenv()。 Visual Studio中未定义的标识符的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!