windows qt 使用gsoap访问 WSDL 网络接口，以天气预报网站为示例

gsoap官方文档： https://www.genivia.com/docs.html

Web服务URL：http://ws.webxml.com.cn/WebServices/WeatherWS.asmx

web服务WSDL:http://ws.webxml.com.cn/WebServices/WeatherWS.asmx?WSDL

1. gsoap 下载：

• 下载链接：https://www.genivia.com/products.html ，下载开源版本（最右边一项，open source）
  

• 解压到当前目录。

2.用gsoap生成接口文件

• 打开cmd.exe
• 进入 gsoap的解压目录 如：C:\Users\admin\Documents\projects\Beier-Pro\gsoap-2.8\gsoap\bin\win32（gsoap 有win64、win32等版本，建议使用win32）
• 输入命令生成 接口文件 ： myESSoap.h（可自定义文件名称）
  wsdl2h -o myESSoap.h http://ws.webxml.com.cn/WebServices/WeatherWS.asmx?WSDL
  
• 生成可调用的接口文件：
  **命令：soapcpp2.exe myESSoap.h -I …\import **
  

3.将生成的文件添加至项目中

• 在qt 工程中创建文件夹，将上一步生成接口文件目录中，除wsdl2h.exe、soapcpp2.exe、myESSoap.h之外的其它文件都拷贝至此目录。
• 拷贝 gsoap_2.8.122\gsoap-2.8\gsoap 下的 stdsoap2.cpp stdsoap2.h 至上一步所建目录中。
• 拷贝之后项目目录结构如下：
  
• 修改打开qt creator，修改.pro文件，将以下几个文件引入项目中：

SOURCES += \
    gSoapWheather/soapC.cpp \
    gSoapWheather/soapClient.cpp \
    gSoapWheather/stdsoap2.cpp \
    main.cpp \
    mysoap.cppS


HEADERS += \
    mysoap.h \
    gSoapWheather/myESSoap.h \
    gSoapWheather/soapH.h \
    gSoapWheather/soapStub.h \
    gSoapWheather/stdsoap2.h

INCLUDEPATH += ./gSoapWheather

• 加载ws2_32.lib库，在.pro文件中最后面添加如下代码：

LIBS += -lws2_32    

*main.cpp

#include 
#include "mysoap.h"

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    MySoap w;

    return a.exec();
    
}

• mysoap.cpp

#include "mysoap.h"
#include "gSoapWheather/soapH.h"
#include "gSoapWheather/soapStub.h"
#include "gSoapWheather/stdsoap2.h"
#include "gSoapWheather/WeatherWSSoap.nsmap"
#include 

MySoap::MySoap(QObject *parent)
    : QObject(parent)
{
    struct soap m_soap;
    soap_init(&m_soap);
    soap_set_mode(&m_soap, SOAP_C_UTFSTRING); //解决gsoap中文乱码问题
    _ns1__getSupportCityString req;           // 传递数据, 和接口名对应  _ns1__xxxxx
    _ns1__getSupportCityStringResponse res;   // 接收数据, 和接口名对应  _ns1__xxxxxResponse

    QString url("http://ws.webxml.com.cn/WebServices/WeatherWS.asmx");
    QString acton("http://www.w3.org/2003/05/soap-envelope");
    std::string str = "shanghai";
    req.theRegionCode = &str; //接口参数
    int ErrNo = soap_call___ns1__getSupportCityString(&m_soap, url.toUtf8(), acton.toUtf8(), &req, res);

    if (ErrNo == SOAP_OK) {
        foreach (auto val, res.getSupportCityStringResult->string) {
            qDebug() << "res:" << val.data();
        }
    }
    if (m_soap.error != 0) {
        //获取错误提示
        QString errStr = QString::fromLocal8Bit(*soap_faultstring(&m_soap));
        qDebug() << "错误提示: " << errStr << "error code:" << m_soap.error;
    }
    soap_end(&m_soap);
    soap_done(&m_soap);
}

参考：https://blog.csdn.net/chen1231985111/article/details/126125568，感谢！