Question

这里的第一篇文章...我试图让这段代码工作，它编译但是抛出了一段。函数返回后，我尝试使用指针访问数据时出错。我想在函数结束后数据被删除所以指针丢失了。我经常搜索并认为修复它的唯一方法是，如果其他人可以查看我的代码并指出我正确的方向。提前很多。

/* 
 * Compile with:
 * g++ -std=c++11 -o gsoap_pf_download_config main.cpp soapC.cpp \
 * soapBasicHttpBinding_USCOREIPagaFacilCobroServiceProxy.cpp -lgsoap++ 
 */

#include "soapBasicHttpBinding_USCOREIPagaFacilCobroServiceProxy.h"
#include "BasicHttpBinding_USCOREIPagaFacilCobroService.nsmap"
#include <string>

std::string BVserialNum = "ACF90004";
std::string BVid =        "215";
std::string latitud =     "0";
std::string longitud =    "0";

class SoapClient {
  ns2__ParametrosEnvio *parameters;
  ns2__ArrayOfParametrosEnvio *parametersArray;

  public:
    int downloadConfig();

  private:
    std::string getToken(std::string date, std::string time);
    std::string getProcessKey(std::string token);
    int createClient(_tempuri__AperturaTerminalConsumo &client);
};

int SoapClient::createClient(_tempuri__AperturaTerminalConsumo &client) {
  timeval curTime;
  gettimeofday(&curTime, NULL);
  std::string date = getDate(curTime);
  std::string time = getTime(curTime);
  std::string timeMicro = getTimeWithMicroSecs(curTime);

  std::string token = getToken(date, time);
  std::string processKey = getProcessKey(token);

  ns2__ParametrosEnvio *arrayParam1 = new ns2__ParametrosEnvio(); 
  ns2__ParametrosEnvio *arrayParam2 = new ns2__ParametrosEnvio();
  ns2__ParametrosEnvio *arrayParam3 = new ns2__ParametrosEnvio();
  ns2__ParametrosEnvio *arrayParam4 = new ns2__ParametrosEnvio();
  ns2__ParametrosEnvio *arrayParam5 = new ns2__ParametrosEnvio();
  ns2__ParametrosEnvio *arrayParam6 = new ns2__ParametrosEnvio();
  ns2__ParametrosEnvio *arrayParam7 = new ns2__ParametrosEnvio();

  std::string tokenStr = "TerminalToken";
  std::string processKeyStr = "LlaveProceso";
  std::string serialNumStr = "TerminalSerie";
  std::string dateStr = "TerminalFecha";
  std::string timeStr = "TerminalHora";
  std::string latStr = "Latitud";
  std::string lonStr = "Longitud";

  arrayParam1->Key = &tokenStr;
  arrayParam1->Data = &token;
  arrayParam2->Key = &processKeyStr;
  arrayParam2->Data = &processKey;
  arrayParam3->Key = &serialNumStr;
  arrayParam3->Data = &BVserialNum;
  arrayParam4->Key = &dateStr;
  arrayParam4->Data = &date;
  arrayParam5->Key = &timeStr;
  arrayParam5->Data = &time;
  arrayParam6->Key = &latStr;
  arrayParam6->Data = &latitud;
  arrayParam7->Key = &lonStr;
  arrayParam7->Data = &longitud;

  std::vector<ns2__ParametrosEnvio*  > parametersVector;
  parametersVector.push_back(arrayParam1);
  parametersVector.push_back(arrayParam2);
  parametersVector.push_back(arrayParam3);
  parametersVector.push_back(arrayParam4);
  parametersVector.push_back(arrayParam5);
  parametersVector.push_back(arrayParam6);
  parametersVector.push_back(arrayParam7);

  ns2__ArrayOfParametrosEnvio parametersArray;
  parametersArray.ParametrosEnvio = parametersVector;

  ns2__ParametrosEnvio parameters;
  parameters.ListaDatos = &parametersArray;

  client.Parametros = &parameters;

  int i = 0;
  for (std::vector<ns2__ParametrosEnvio*  >::iterator it = \
    parametersVector.begin(); it != parametersVector.end(); ++it) {
    std::cout << *it << ":" \
    << *client.Parametros->ListaDatos->ParametrosEnvio.at(i)->Key << ":" \
    << *client.Parametros->ListaDatos->ParametrosEnvio.at(i)->Data \
    << std::endl;
    ++i;
  }

  return SOAP_OK;
}

int SoapClient::downloadConfig() {
  BasicHttpBinding_USCOREIPagaFacilCobroServiceProxy service;
  _tempuri__AperturaTerminalConsumo client;
  _tempuri__AperturaTerminalConsumoResponse response;
  createClient(client);

  std::cout << *client.Parametros->ListaDatos->ParametrosEnvio.at(0)->Key << std::endl;
  std::cout << *client.Parametros->ListaDatos->ParametrosEnvio.at(1)->Key << std::endl;
  std::cout << *client.Parametros->ListaDatos->ParametrosEnvio.at(2)->Key << std::endl;
  std::cout << *client.Parametros->ListaDatos->ParametrosEnvio.at(3)->Key << std::endl;
  std::cout << *client.Parametros->ListaDatos->ParametrosEnvio.at(4)->Key << std::endl;
  std::cout << *client.Parametros->ListaDatos->ParametrosEnvio.at(5)->Key << std::endl;
  std::cout << *client.Parametros->ListaDatos->ParametrosEnvio.at(6)->Key << std::endl;

  int ret = service.AperturaTerminalConsumo(&client, response);
  if (ret == SOAP_OK) {
    std::cout << "id:" << *response.AperturaTerminalConsumoResult-> \
    TerminalConsumo->Id << std::endl;
    std::cout << "locality:" << *response.AperturaTerminalConsumoResult-> \
    TerminalConsumo->LocalidadDispositivoId << std::endl;
    std::cout << "route:" << *response.AperturaTerminalConsumoResult-> \
    Ruta->Id << std::endl;
    std::cout << "fare:" << *response.AperturaTerminalConsumoResult-> \
    Ruta->Tarifa << std::endl;
  }
  else
    service.soap_stream_fault(std::cerr);

  service.destroy(); // delete data and release memory
}

int main()
{ 
  SoapClient client;
  client.downloadConfig();
}

``

Answer 1

让我们看看以下几行：

ns2__ArrayOfParametrosEnvio parametersArray;
...
ns2__ParametrosEnvio parameters;
parameters.ListaDatos = &parametersArray;
client.Parametros = &parameters;

在此声明本地变量parametersArray和parameters，然后保存指向这些变量的指针。

当函数返回时，这些变量超出范围并且对象被破坏。您保存的指针不再指向有效对象。尝试使用它们会导致未定义的行为。

你有两个解决方案：你不使用指针，而是复制对象（我的推荐）。或者您需要使用new动态分配这些对象（并记住使用delete释放它们。）

返回指向对象指针向量的指针后数据丢失

1 个答案: