Linux上使用vcpkg + CMake配置cpprest

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vcpkg的使用在Linux平台与Windows平台没什么差异就不过多阐述。

有一点需要注意的是Windows上安装的包默认是x86而Linux上默认是x64。

vcpkg安装cpprest

cpprest库依赖很多库比如boostopenssl等但不用操心vcpkg会帮我们自带安装。

./vcpkg install cpprestsdk

问题

需要注意的是安装过程很有可能会失败除网络原因外还有一个地方会出错

CMake Error at scripts/cmake/vcpkg_execute_build_process.cmake:134 (message):
    Command failed: /home/vcpkg/downloads/tools/cmake-3.25.1-linux/cmake-3.25.1-linux-x86_64/bin/cmake --build . --config Debug --target install -- -v -j3
    Working Directory: /home/vcpkg/buildtrees/openssl/x64-linux-dbg
    See logs for more information:
      /home/vcpkg/buildtrees/openssl/install-x64-linux-dbg-out.log

Call Stack (most recent call first):
  installed/x64-linux/share/vcpkg-cmake/vcpkg_cmake_build.cmake:74 (vcpkg_execute_build_process)
  installed/x64-linux/share/vcpkg-cmake/vcpkg_cmake_install.cmake:16 (vcpkg_cmake_build)
  ports/openssl/unix/portfile.cmake:21 (vcpkg_cmake_install)
  ports/openssl/portfile.cmake:33 (include)
  scripts/ports.cmake:147 (include)


error: building openssl:x64-linux failed with: BUILD_FAILED
error: Please ensure you're using the latest port files with `git pull` and `vcpkg update`.
Then check for known issues at:
    https://github.com/microsoft/vcpkg/issues?q=is%3Aissue+is%3Aopen+in%3Atitle+openssl
You can submit a new issue at:
    https://github.com/microsoft/vcpkg/issues/new?template=report-package-build-failure.md&title=[openssl]+Build+error
Include '[openssl] Build error' in your bug report title, the following version information in your bug description, and attach any relevant failure logs from above.
    vcpkg-tool version: 2023-01-24-8a88d63f241d391772fbde69af9cab96c3c64c75
    vcpkg-scripts version: 91dd61bd4 2023-01-27 (2 days ago)

通过查看/home/vcpkg/buildtrees/openssl/install-x64-linux-dbg-out.log日志可以发现

[1/3] cd /home/Listening/vcpkg/buildtrees/openssl/x64-linux-dbg/nssl-3.0.7-96d825e305.clean && export PATH=/bin:/opt/rh/devtoolset-8/root/usr/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/bin:/home/Listening/vcpkg/downloads/tools/ninja/1.10.2-linux && export CC=/opt/rh/devtoolset-8/root/usr/bin/cc && export AR=/opt/rh/devtoolset-8/root/usr/bin/ar && export LD=/opt/rh/devtoolset-8/root/usr/bin/ld && export RANLIB=/opt/rh/devtoolset-8/root/usr/bin/ranlib && export MAKE=/bin/make && export MAKEDEPPROG=/opt/rh/devtoolset-8/root/usr/bin/cc && export WINDRES= && /bin/perl Configure no-shared no-module enable-static-engine no-zlib no-ssl2 no-idea no-cast no-seed no-md2 no-tests linux-x86_64 --prefix=/home/Listening/vcpkg/packages/openssl_x64-linux/debug --libdir=/home/Listening/vcpkg/packages/openssl_x64-linux/debug/lib --openssldir=/etc/ssl "-fPIC -g" && /home/Listening/vcpkg/downloads/tools/cmake-3.25.1-linux/cmake-3.25.1-linux-x86_64/bin/cmake -DDIR=/home/Listening/vcpkg/buildtrees/openssl/x64-linux-dbg/nssl-3.0.7-96d825e305.clean -P /home/Listening/vcpkg/ports/openssl/unix/remove-deps.cmake
FAILED: nssl-3.0.7-96d825e305.clean/Makefile /home/Listening/vcpkg/buildtrees/openssl/x64-linux-dbg/nssl-3.0.7-96d825e305.clean/Makefile 
cd /home/Listening/vcpkg/buildtrees/openssl/x64-linux-dbg/nssl-3.0.7-96d825e305.clean && export PATH=/bin:/opt/rh/devtoolset-8/root/usr/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/bin:/home/Listening/vcpkg/downloads/tools/ninja/1.10.2-linux && export CC=/opt/rh/devtoolset-8/root/usr/bin/cc && export AR=/opt/rh/devtoolset-8/root/usr/bin/ar && export LD=/opt/rh/devtoolset-8/root/usr/bin/ld && export RANLIB=/opt/rh/devtoolset-8/root/usr/bin/ranlib && export MAKE=/bin/make && export MAKEDEPPROG=/opt/rh/devtoolset-8/root/usr/bin/cc && export WINDRES= && /bin/perl Configure no-shared no-module enable-static-engine no-zlib no-ssl2 no-idea no-cast no-seed no-md2 no-tests linux-x86_64 --prefix=/home/Listening/vcpkg/packages/openssl_x64-linux/debug --libdir=/home/Listening/vcpkg/packages/openssl_x64-linux/debug/lib --openssldir=/etc/ssl "-fPIC -g" && /home/Listening/vcpkg/downloads/tools/cmake-3.25.1-linux/cmake-3.25.1-linux-x86_64/bin/cmake -DDIR=/home/Listening/vcpkg/buildtrees/openssl/x64-linux-dbg/nssl-3.0.7-96d825e305.clean -P /home/Listening/vcpkg/ports/openssl/unix/remove-deps.cmake
Can't locate IPC/Cmd.pm in @INC (@INC contains: /home/Listening/vcpkg/buildtrees/openssl/x64-linux-dbg/nssl-3.0.7-96d825e305.clean/util/perl /opt/rh/devtoolset-8/root//usr/lib64/perl5/vendor_perl /opt/rh/devtoolset-8/root/usr/lib/perl5 /opt/rh/devtoolset-8/root//usr/share/perl5/vendor_perl /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 . /home/Listening/vcpkg/buildtrees/openssl/x64-linux-dbg/nssl-3.0.7-96d825e305.clean/external/perl/Text-Template-1.56/lib) at /home/Listening/vcpkg/buildtrees/openssl/x64-linux-dbg/nssl-3.0.7-96d825e305.clean/util/perl/OpenSSL/config.pm line 19.
BEGIN failed--compilation aborted at /home/Listening/vcpkg/buildtrees/openssl/x64-linux-dbg/nssl-3.0.7-96d825e305.clean/util/perl/OpenSSL/config.pm line 19.
Compilation failed in require at Configure line 23.
BEGIN failed--compilation aborted at Configure line 23.
ninja: build stopped: subcommand failed.

里面有个关键词Can't locate IPC/Cmd.pm说明在编译OpenSSL时需要的Perl模块 IPC::Cmd 没有安装。

解决

Perl模块 IPC::Cmd 没有安装需要安装CPAN模块再安装IPC::Cmd

在Linux或Unix系统中通常可以使用包管理器安装CPAN模块。比如在Debian或Ubuntu上使用以下命令安装CPAN

sudo apt-get install cpanminus

如果在其他系统上查找与您的系统相对应的包管理器命令。比如我这里是CentOS 7系统

sudo yum install perl-CPAN

安装完后使用以下命令安装所需的模块

cpanm IPC::Cmd //Debian或Ubuntu

cpan IPC::Cmd // CentOS

CMake使用cpprest

CMake中使用vcpkg安装的包需要注意几点

  1. CMakeLists.txt文件中设置vcpkg的root目录且需要在project()语句之前
  2. cpprest配置文件路径
cmake_minimum_required(VERSION 3.20)

# 设置VCPKG_ROOT所在的位置
set(VCPKG_ROOT "home/vcpkg/scripts/buildsystems/vcpkg.cmake" CACHE PATH "")
set(CMAKE_TOOLCHAIN_FILE ${VCPKG_ROOT})

project(demo)

set(CMAKE_CXX_STANDARD 14)
# 设置cppresst库所在路径
set(cpprest_DIR "/home/vcpkg/installed/x64-linux/share/cpprestsdk")
find_package(cpprestsdk CONFIG REQUIRED)

add_executable(demo main.cpp)

target_link_libraries(demo PRIVATE pthread cpprestsdk::cpprest)

通过CMake + vcpkg有个好处就是不用手写cpprest所依赖的库不然target_link_libraries还得加上boost、openssl等。

接下来就可以使用cpprest库了

//main.cpp
#include <iostream>
#include <string>
#include "cpprest/http_client.h"
#include "cpprest/uri_builder.h"
#include "cpprest/http_msg.h"
#include "pplx/pplxtasks.h"
#include "cpprest/json.h"
#include "cpprest/uri.h"


using namespace web;
using namespace web::http;
using namespace web::http::client;
using namespace web::json;

std::string send_request(const std::string &url, const std::string& arg) {
    web::http::client::http_client client(url);
    // Build request URI and start the request.
    uri_builder builder(arg);

    std::string re{};
    client.request(methods::GET, builder.to_string())
                    // continue when the response is available
            .then([](http_response response) -> pplx::task<web::json::value> {
                // if the status is OK extract the body of the response into a JSON value
                // works only when the content type is application\json
                if(response.status_code() == status_codes::OK) {
                    return response.extract_json();
                }

                // return an empty JSON value
                return pplx::task_from_result(web::json::value());
            })
                    // continue when the JSON value is available
            .then([&re](pplx::task<web::json::value> previousTask) {
                // get the JSON value from the task and display content from it
                try {
//                    web::json::value const& v = previousTask.get();
                    re = previousTask.get().serialize();
                } catch (http_exception const & e) {
                    printf("Error exception:%s\n", e.what());
                }
            })
            .wait();
    return re;
}

int main()
{
    std::string url{"http://10.2.3.4:2345"};
    std::string arg{"api/storage/service-alarm-info/"};
    auto result = send_request(url,arg);
    std::cout<<result<<"\n";

    while (1)
    {
        /* code */
    }
    
    return 0;
}

注意由于是事后记录当时为了使用vcpkg + cmake+ cpprest方案所踩的坑故有不完整的地方或遗漏还请谅解

阿里云国内75折 回扣 微信号：monov8
阿里云国际，腾讯云国际，低至75折。AWS 93折 免费开户实名账号 代冲值 优惠多多 微信号：monov8 飞机：@monov6
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