mingw 编译 curl ,Qt 工程使用

mingw 编译 curl

下载curl 源码

https://github.com/curl/curl

我使用8.3版

CMake-gui 配置

源码路径：D:/workspace/CPP/curl-8.3.0
生成路径: D:/workspace/CPP/curl-8.3.0/mingw-build

点击 Configure ,弹窗配置，选择 MinGW Makefiles 选择 Specify native compilers

点击 next 配置编译器路径
C 编译器 ： C:/Qt/Qt5.12.12/Tools/mingw730_64/bin/gcc.exe
C++ 编译器 ： C:/Qt/Qt5.12.12/Tools/mingw730_64/bin/g++.exe

点击 Finish

报错 ： CMake Error: CMake was unable to find a build program corresponding to “MinGW Makefiles”. CMAKE_MAKE_PROGRAM is not set.

勾选 Advanced 配置 CMAKE_MAKE_PROGRAM 变量 C:/Qt/Qt5.12.12/Tools/mingw730_64/bin/mingw32-make.exe

生成 Makefiles

点击Generate 生成

编译

打开 Qt mingw 命令行窗口

切换到 生成 Makefiles的路径 D:\workspace\CPP\curl-8.3.0\mingw-build

cd /d  D:\workspace\CPP\curl-8.3.0\mingw-build

输入命令编译:

mingw32-make -f Makefile

生成库 libcurl.dll.a libcurl.dll：

在Qt 工程中使用

新建Qt 工程
在源码目录新建 libcurl ：
curl 源码 include 目录 copy到 libcurl

libcurl/include/curl
lib/libcurl.dll
lib/libcurl.dll.a

pro中添加

LIBS += -L$$PWD/libcurl/lib/ -llibcurl.dll
INCLUDEPATH += $$PWD/libcurl/include
DEPENDPATH += $$PWD/libcurl/include

main.cpp 中替换 http://example.com/login 为需要测试的url

#include 
#include 
#include 
size_t WriteCallback(void *contents, size_t size, size_t nmemb, std::string *userp) {
    userp->append((char*)contents, size * nmemb);
    return size * nmemb;
}
std::string postData(const std::string& username, const std::string& password) {
    CURL *curl;
    CURLcode res;
    std::string buffer;
    curl_global_init(CURL_GLOBAL_DEFAULT);
    curl = curl_easy_init();
    if(curl) {

        //http://example.com/login
        curl_easy_setopt(curl, CURLOPT_URL, "http://example.com/login"); // Replace with your URL
        // Set the POST data
        curl_easy_setopt(curl, CURLOPT_POSTFIELDS, "username=" + username + "&password=" + password);
        // Activate writing the received data to a buffer instead of sending it to stdout
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);
        // Perform the POST request
        res = curl_easy_perform(curl);
        // Check for errors
        if(res != CURLE_OK) {
            std::cerr << "curl_easy_perform() failed: " << curl_easy_strerror(res) << std::endl;
        }
        // Always cleanup
        curl_easy_cleanup(curl);
    }
    // Deinitialize cURL stuff
    curl_global_cleanup();
    return buffer;
}
int main() {
    std::string username = "myusername";
    std::string password = "mypassword";
    std::string response = postData(username, password);
    std::cout << response << std::endl;
    return 0;
}