#include <cstdlib> #include <iostream> int main() { if (const char* env_p = std::getenv("PATH")) std::cout << "Your PATH is: " << env_p << '\n'; } Possible output: Your PATH is: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games See also C documentation for getenv
External Links−Non-ANSI/ISO Libraries−Index−std Symbol Index C reference C89,C95,C99,C11,C17,C23│Compiler supportC99,C23 Language Basic concepts Keywords Preprocessor Expressions Declaration Initialization Functions Statements Headers Type support ...
1)has_value()?**this:static_cast<T>(std::forward<U>(default_value)); 2)has_value()?std::move(**this):static_cast<T>(std::forward<U>(default_value)) Example Run this code #include <cstdlib>#include <iostream>#include <optional>std::optional<constchar*>maybe_getenv(constchar*n){...
registers a function to be called onstd::exit()invocation (function) at_quick_exit (C++11) registers a function to be called onstd::quick_exitinvocation (function) system calls the host environment's command processor (function) getenv
运行本示例前请先在本地环境中设置环境变量HUAWEICLOUD_SDK_AK和HUAWEICLOUD_SDK_SK std::string ak = GetEnv("HUAWEICLOUD_SDK_AK"); std::string sk = GetEnv("HUAWEICLOUD_SDK_SK"); std::string region = ""; std::string projectId = ""; AuthInfo authInfo(ak, sk, region, projectId); //...
get(); // Connects to the cluster std::cout << "Started the Hazelcast C++ client instance " << hz.get_name() << std::endl; // Prints client instance name return 0; }This should print logs about the cluster members and information about the client itself such as client type and ...
std::string endpoint = "cn-hangzhou.log.aliyuncs.com"; // 本示例从环境变量中获取AccessKey ID和AccessKey Secret。 string accessId = (string)getenv("ALIBABA_CLOUD_ACCESS_KEY_ID"); string accessKey = (string)getenv("ALIBABA_CLOUD_ACCESS_KEY_SECRET"); // Project名称。 std::string project = ...
std::string ak = GetEnv("HUAWEICLOUD_SDK_AK"); std::string sk = GetEnv("HUAWEICLOUD_SDK_SK"); string region = ""; string projectId = ""; AuthInfo authInfo(ak, sk, region, projectId); // 1.2 config Connect parameter HttpConfig httpConfig; httpConfig.SetReadTimeout(20000); httpCon...
string accessKeyId = (string)getenv("ALIBABA_CLOUD_ACCESS_KEY_ID"); string accessKey = (string)getenv("ALIBABA_CLOUD_ACCESS_KEY_SECRET"); // Project名称。 string project = ""; // Logstore名称。 string logstore = ""; // 日志主题。 string topic = ""; // 日志服务Client。 LOGClient *...