我想从数字保险箱获得密码，然后将其返回给我的主程序。 该密码是一个字符串，我必须将其返回为c（请参见下面的代码）。 我发现以下问题：
当我比较c和c2时，它们都具有相同的特性（类型，值，长度，十六进制代码未在此处显示）。
#include <iostream>
#include <string>
#include <fstream>
#include <typeinfo>
#include <vector>
#include <sstream>
#include <iterator>
#include <algorithm>
#include <stdio.h>
#include <iomanip>
//hostname
#include <unistd.h>
#include <limits.h>
//lms
#include "CPasswordSDK.h"
#include "keyStore.h"
#include <stdlib.h>
#include <string.h>
using namespace std;
char* KeyStore::getPwd(const string& aUID)
{
cout << "getPwd called for " << aUID.c_str() << endl;
return KeyStore::getPwd(aUID.c_str());
}
char* KeyStore::getPwd(const char* const aUID){
//lms
int iRc = 0;
ObjectHandle hResponse = NULL;
ObjectHandle hRequest = NULL;
char** pVals = NULL;
char QueryStr[200];
string AppBillingString;
string SafeString;
string FolderString;
string ObjectString;
const char* userconst;
userconst = aUID;
char* userchar = const_cast<char*>(userconst);
string user(userchar);
string str;
//host
char hostname[HOST_NAME_MAX];
gethostname(hostname, HOST_NAME_MAX);
string server(hostname);
//Creation de la requete
string passwordString = "PASSWORD";
char* password = strdup(passwordString.c_str());
hRequest = PSDK_CreateRequest(password);
if (hRequest != NULL){
string AppDescsIDString = "AppDescs.AppID";
char* AppDescsID = strdup(AppDescsIDString.c_str());
string ligne;
string res;
ifstream fichier;
fichier.open("cfnconf.csv", ios::in);
int i = 0;
while(fichier){
string element;
if(!getline(fichier, element)){
break;
}
istringstream line(element);
vector<string>row;
while (line){
if(!getline(line, element, ';')){
i=0;
break;
}
row.push_back(element);
i++;
}
if((server.compare(row[0])==0)&&(user.compare(row[1])==0)){
AppBillingString=row[2];
SafeString=row[3];
FolderString=row[4];
ObjectString=row[5];
break;
}
row.push_back(element);
}
if(!fichier.eof()){
}
char* AppBilling = strdup(AppBillingString.c_str());
iRc = PSDK_SetAttribute(hRequest, AppDescsID, AppBilling);
if (iRc == PSDK_RC_ERROR){
cout << "APP_ID non trouve" << endl;
}
string QueryString = "Query";
char* Query = strdup(QueryString.c_str());
char* AppSafe = strdup(SafeString.c_str());
char* AppFolder = strdup(FolderString.c_str());
char* AppObject = strdup(ObjectString.c_str());
sprintf(QueryStr, "Safe=%s;Folder=%s;Object=%s", AppSafe, AppFolder, AppObject);
iRc = PSDK_SetAttribute(hRequest, Query, QueryStr);
if (iRc == PSDK_RC_ERROR){
cout << "Query pas bonne" << endl;
}
}
//Envoi de la requete
iRc = PSDK_GetPassword(hRequest, &hResponse);
if (iRc == PSDK_RC_ERROR){
printf ("error code: [%d], error message: [%s]\n", PSDK_GetErrorCode(hRequest), PSDK_GetErrorMsg(hRequest));
cout << "erreur 1" << endl;
}
else{
pVals = PSDK_GetAttribute(hResponse, password);
if (iRc == PSDK_RC_ERROR){
printf("error code: [%d], error message: [%s]\n", PSDK_GetErrorCode(hResponse), PSDK_GetErrorMsg(hResponse));
cout << "erreur 2" << endl;
}
else{
str = pVals[0];
printf("adresses pVals[0] %p, *pVals %p, pVals %p\n", pVals[0], *pVals, pVals );
printf("password pVals[0]=[%s]\n", pVals[0]);
printf("password *pVals=[%s]\n", *pVals);
PSDK_ReleaseAttributeData(&pVals);
}
}
if (hRequest != NULL){
PSDK_ReleaseHandle(&hRequest);
}
if (hResponse != NULL){
PSDK_ReleaseHandle(&hResponse);
}
/*
higher we have the password stored in a string str
*/
char *c =&str[0];
string str2="BV2OA_MAJ00";
// here I create a new variable with the same content than the password str
const char *c2=str2.c_str();
printf("adresse c2 %p\n", c2);
//below i will compare str and str2 and c and c2
cout << "password length : " << strlen(c) << endl;
cout << "password2 length : " << strlen(c2) << endl;
int result = strcmp(c, c2);
cout << "strcmp c and c2 : " << result << endl;
cout << "c :"<<c<<":"<< endl;
cout << "c2:"<<c2<<":"<<endl;
cout << "pVals[0] type : " << typeid(pVals[0]).name() << endl;
cout << "*pVals[0] type : " << typeid(*pVals[0]).name() << endl;
cout << "str type : " << typeid(str).name() << endl;
cout << "str value : " << str << endl;
cout << "str2 type : " << typeid(str2).name() << endl;
cout << "str2 value : " << str2 << endl;
cout << "c type : " << typeid(c).name() << endl;
cout << "c value : " << c << endl;
cout << "c2 type : " << typeid(c2).name() << endl;
cout << "c2 value : " << c2 << endl;
cout << "const_cast char *c type : " << typeid(const_cast<char*>(c)).name() << endl;
cout << "const_cast char *c value : " << const_cast<char*>(c) << endl;
cout << "const_cast char *c2 type : " << typeid(const_cast<char*>(c2)).name() << endl;
cout << "const_cast char *c2 value : " << const_cast<char*>(c2) << endl;
return c;
}
（可执行文件）日志如下。您会看到两个密码相同。
adresse c2 0x9edf08
password length : 11
password2 length : 11
strcmp c and c2 : 0
c :BV2OA_MAJ00:
c2:BV2OA_MAJ00:
pVals[0] type : Pc
*pVals[0] type : c
str type : Ss
str value : BV2OA_MAJ00
str2 type : Ss
str2 value : BV2OA_MAJ00
c type : Pc
c value : BV2OA_MAJ00
c2 type : PKc
c2 value : BV2OA_MAJ00
const_cast char *c type : Pc
const_cast char *c value : BV2OA_MAJ00
const_cast char *c2 type : Pc
const_cast char *c2 value : BV2OA_MAJ00
在我的主窗口中，我还显示返回的密码：
PASSWORD MAIN : [BV2OA_MAJ00]
为什么我返回c2而不是返回c1时共享库能工作？
感谢您的指导！
P.S。这是我的第一个问题，希望我不要忘记任何事情。