Can you please tell me whether SEAL 3.1 supports PolyCRTBuilder class? I am trying to run the following program but failed because the class is not declared in this scope.
/**
Suppose I have two arrays x = [1,2,3,4,5] and xMean = [3,3,3,3,3]. I composed and encrypted the two array using PolyCRTBuilder ( xCiphertext and xMeanCiphertext ) . If I subtract the two ciphertexts ( xCiphertext MINUS xMeanCiphertext ), I should get xResult = [-2, -1, 0, 1, 2] but after the homomorphic subtraction I am getting xResultDecrypted = [40959, 40960, 0 ,1, 2] . I can relate the overflow result to the plain modulus set but is there a work around for this problem. Here is the code:
*/
#include <iostream>
#include "seal/seal.h"
using namespace std;
using namespace seal;
/*
Helper function: Prints the parameters in a SEALContext.
*/
void print_parameters(shared_ptr<SEALContext> context)
{
// Verify parameters
if (!context)
{
throw invalid_argument("context is not set");
}
auto &context_data = *context->context_data();
/*
Which scheme are we using?
*/
string scheme_name;
switch (context_data.parms().scheme())
{
case scheme_type::BFV:scheme_name = "BFV";
break;
case scheme_type::CKKS:scheme_name = "CKKS";
break;
default:
throw invalid_argument("unsupported scheme");
}
cout << "/ Encryption parameters:" << endl;
cout << "| scheme: " << scheme_name << endl;
cout << "| poly_modulus_degree: " << context_data.parms().poly_modulus_degree() << endl;
/*
Print the size of the true (product) coefficient modulus.
*/
cout << "| coeff_modulus size: " << context_data.
total_coeff_modulus_bit_count() << " bits" << endl;
/*
For the BFV scheme print the plain_modulus parameter.
*/
if (context_data.parms().scheme() == scheme_type::BFV)
{
cout << "| plain_modulus: " << context_data.
parms().plain_modulus().value() << endl;
}
cout << "\\ noise_standard_deviation: " << context_data.
parms().noise_standard_deviation() << endl;
cout << endl;
}
int main(){
cout << "\nTotal memory allocated from the current memory pool: "<< (MemoryManager::GetPool().alloc_byte_count() >> 20) << " MB" << endl;
EncryptionParameters parms(scheme_type::BFV);
//EncryptionParameters parms;
parms.set_poly_modulus_degree(4096);
parms.set_coeff_modulus(coeff_modulus_128(4096));
parms.set_plain_modulus(40961); ////Make the coefficient modulus prime>2n to enable CRT batching
auto context = SEALContext::Create(parms);
print_parameters(context);
IntegerEncoder encoder(parms.plain_modulus());
KeyGenerator keygen(context);
PublicKey public_key = keygen.public_key();
SecretKey secret_key = keygen.secret_key();
// SEALContext context(parms);
// KeyGenerator keygen(context);
// auto public_key = keygen.public_key();
// auto secret_key = keygen.secret_key();
Encryptor encryptor(context, public_key);
Evaluator evaluator(context);
Decryptor decryptor(context, secret_key);
PolyCRTBuilder crtbuilder(context);
int slot_count = crtbuilder.slot_count();
int row_size = slot_count / 2;
vector<uint64_t> x_pod_matrix(slot_count, 0);
x_pod_matrix[0] = 1;
x_pod_matrix[1] = 2;
x_pod_matrix[2] = 3;
x_pod_matrix[3] = 4;
x_pod_matrix[4] = 5;
Plaintext x_plain_matrix;
crtbuilder.compose(x_pod_matrix, x_plain_matrix);
Ciphertext x_encrypted_matrix;
encryptor.encrypt(x_plain_matrix, x_encrypted_matrix);
vector<uint64_t> x_mean_pod_matrix(slot_count, 0);
x_mean_pod_matrix[0] = 3;
x_mean_pod_matrix[1] = 3;
x_mean_pod_matrix[2] = 3;
x_mean_pod_matrix[3] = 3;
x_mean_pod_matrix[4] = 3;
Plaintext x_mean_plain_matrix;
crtbuilder.compose(x_mean_pod_matrix, x_mean_plain_matrix);
Ciphertext x_mean_encrypted_matrix;
encryptor.encrypt(x_mean_plain_matrix, x_mean_encrypted_matrix);
evaluator.sub_plain(x_encrypted_matrix, x_mean_encrypted_matrix);
// Decrypt x_encrypted_matrix
Plaintext x_plain_result;
decryptor.decrypt(x_encrypted_matrix, x_plain_result);
vector<uint64_t> pod_result;
crtbuilder.decompose(x_plain_result, pod_result);
for(int i = 0; i < 5; i++) {
std::cout << pod_result[i] << '\n';
}
return 0;
}
PolyCRTBuilder has been renamed to BatchEncoder. Take a look at the src/examples directory in SEAL v3.1 (or native/examples in a newer version) and you'll see plenty of examples.
Kind of related to your question: the coeff_modulus_128 function hasn't existed in SEAL for quite a while; the same functionality is provided by the CoeffModulus::BFVDefault function. With these changes your code might work in SEAL 3.5 even.
Related
I am working on an assignment for school using hash tables in a structure program. Part of the assignment is writing a hash table composed of 20 primary buckets and 10 overflow buckets, each with 3 slots composed of a key and data field to disk and then restoring from it. Here is what I have so far:
#include <iostream>
#include <fstream>
#include <iomanip>
#include <stdio.h>
#include <string.h> // for strcpy()
using namespace std;
typedef char STR10[10+1];
typedef char STR20[20+1];
struct SLOT
{
STR10 key;
STR20 data;
};
struct BUCKET
{
SLOT entry[3];
int count;
BUCKET* overflow;
};
struct HASHTABLE
{
BUCKET pBkt[20];
BUCKET oBkt[10];
};
void WriteHTtoDisk (HASHTABLE ht, char *HashDisk);
void ReportHT (HASHTABLE ht, char * when);
int main()
{
int maxP = 20;
int maxO = 10;
int maxS = 3;
HASHTABLE ht;
STR10 mKey;
STR20 mData;
FILE * inFile;
inFile = fopen("DATAIN.dat","rb");
if (inFile == NULL)
{
cout << " DATAIN file access error ... \n";
cout << " Terminating application ... \n ";
cout << " Press any key ... \n ";
return -100;
}
char crLF;
while (!feof(inFile))
{
fscanf(inFile,"%10c%20c\n",mKey,mData);
mKey[10] = mData[20] = 0; // add string terminators
printf(" MyKey: %10s\n MyData: %20s\n",mKey,mData);
cin.ignore(80,'\n'), cin.get();
//InsertIntoHT (ht, mKey, mData);
}
fclose(inFile);
WriteHTtoDisk(ht, "hashTable.dat");
ReportHT (ht,"BEFORE");
return 0;
}
void WriteHTtoDisk (HASHTABLE ht, char *HashDisk)
{
FILE * HASHDISK = fopen(HashDisk, "rb");
int maxBkt = 30;
int maxSlot = 3;
for (int i = 0; i < maxBkt; i++)
{
for (int j = 0; j < maxSlot; j++)
{
fwrite(ht.pBkt[i].entry[j].key,11,sizeof(maxSlot),HASHDISK);
fwrite(ht.pBkt[i].entry[j].data,21,sizeof(maxSlot),HASHDISK);
}
}
}
void ReportHT (HASHTABLE ht, char * when)
{
int maxB = 30;
int maxS = 3;
cout << "Hash Table \n" << "Verification Report \n" << when << " Restoration" << endl;
for (int b = 0; b < maxB; b++)
{
cout << "Bucket " << (b+1) << endl;
if (b < 20)
{
for (int i = 0; i < maxS; i++)
{
cout << setw(3) << "Slot " << (i+1) << ": " << ht.pBkt[b].entry[i].key << setw(3) << ht.pBkt[b].entry[i].data << endl;
}
}
else
{
for (int i = 0; i < maxS; i++)
{
cout << setw(3) << "Slot " << (i+1) << ": " << ht.oBkt[b].entry[i].key << setw(3) << ht.oBkt[b].entry[i].data << endl;
}
}
}
}
The code compiles with no problems, but when I inspect the file, I find that it is all just gibberish and weird symbols. The data I am using was previously extracted from another file and I want to save it in the format in which it was inserted. I am sure the issue is with the lines with fwrite (I am not that experienced with C syntax as I am with C++).
The data was in the DATAIN.dat file like this:
TATUNG CO.EL PR. LONG BEACH CA
KAMERMAN LCIRRUS BEAVERTON, OR
QUADRAM COLOACH AV NORCROSS GE
AST RESEARALTON AV IRVINE CA
I am expecting the new file to look like this:
TATUNG CO.
EL PR. LONG BEACH CA
KAMERMAN L
CIRRUS BEAVERTON, OR
QUADRAM CO
LOACH AV NORCROSS GE
AST RESEAR
ALTON AV IRVINE CA
Any help would be greatly appreciated. Thank you.
It looks like your code doesn't initialize or even use the member count. When a hash bucket is empty, the count should indicate it. In C++ it's easy to implement: just add = 0 to its definition:
struct BUCKET
{
SLOT entry[3];
int count = 0;
BUCKET* overflow;
};
Also, when writing the bucket's data to a file, use the count and don't assume that all the entries in the bucket are filled.
for (int j = 0; j < ht.pBkt[i].count; j++)
...
Also, write only the required number of bytes. fwrite accepts two parameters: the size of the data elements to write and their number. Here, the size is 11 or 21, and the number is 1, because each fwrite call can only write one string to your file.
fwrite(ht.pBkt[i].entry[j].key,11,1,HASHDISK);
fwrite(ht.pBkt[i].entry[j].data,21,1,HASHDISK);
By the way, since you have a STR10 type, you can avoid magic numbers and write sizeof(STR10) instead of 11. This way, when you change the length of your string, your code will still work.
int gas;
// Input Code
int user_code;
std::cout << std::endl;
std::cout << "Please enter the Code: ";
std::cin >> user_code;
std::cout << "The value you entered is " << user_code;
std::cout << std::endl;
int array1[16] = { 42011, 42017, 42029, 42045,
42091, 42101, 34001, 34005,
34007, 34009, 34011, 34015,
34033, 10001, 10003, 24015 }; // 0.2387 (23.87%)
int array2[45] = { 11001, 24003, 24510, 24005, 24009,
24013, 24017, 24019, 24021, 24025,
24027, 24029, 24031, 24033, 24035,
24037, 24041, 24043, 51510, 51013,
51043, 51047, 51600, 51059, 51610,
51061, 51069, 51630, 51099, 51107,
51683, 51685, 51153, 51157, 51177,
51179, 51187, 51840, 54003, 54027,
54037, 54065, 42001, 42055, 42133 }; //0.2710 (27.10%)
int * array1_search;
array1_search = std::find(array1, array1+ 16, user_code);
int * array2_search;
array2_search = std::find(array2, array2 + 45, user_code);
if (array1_search != array1+ 16) {
std::cout << "Codefound in Array1: " << *array1_search << '\n';
gas= 0.2387;
}
else if (array2_search != array2_search + 45) {
std::cout << "Code found in Array2: " << *array2_search << '\n';
gas= 0.2710;
}
else {
std::cout << "Not found \n";
gas= 0.1506;
}
Above is my current code. I am trying to have the user input a variable user_code value and then iterate over the two arrays array1[16] and array2[45]. If the user input value is on the first array1 I want to assign gas 0.2387 and if the input value is on the other array2 I want to assign gas 0.2710, and if it is not within any array gas should be 0.1506.
So basically I want to assign a value depending on which array the user's input is contained in. I am very new to c++, what is the best way to go about this?
It seems to work fine if I enter a number that is within array1 or array2 and it correctly identifies that is found in array1 or array2. The problem is when I enter a number I know is not within either array to trigger the else statement it identifies it as being in array2. For example, when I enter 12345 as a user_code it says "Code found in Array2: 0". I know 12345 is not contained in array2 and I do not understand why *array2_search is assigned 0. What can I do to fix this so if a user_code is entered that is not contained within array1 or array2 it goes to the else statement?
else if (array2_search != array2_search + 45) {
Should be
else if (array2_search != array2 + 45) {
or better using std::end of C++11:
if (array1_search != std::end(array1)) {
else if (array2_search != std::end(array2)) {
And int gas; => double gas; if you want to be able to store floating point values, not just integers (0.2387 and 0.2710 would give integer 0).
Using standard containers and newer c++ features if you have C++11 minimum you can then do something like this:
int main() {
// Use Constants Instead of "Hard Coded Values"
// If you noticed these are not even needed.
// const unsigned code1 = 16;
// const unsigned code2 = 45;
// Made gas a float instead of an int due to the decimal values
// I also initialized it with the default value if the code is
// not found in either container.
float gas = 0.1506f; // Default Price If Not Found
// created your first array as a const std::vector<int> and
// used its initializer list to populate its contents: this vector
// can not be modified: remove the const if this container
// will need to have entries added in the future.
const std::vector<int> arr1 { 42011, 42017, 42029, 42045,
42091, 42101, 34001, 34005,
34007, 34009, 34011, 34015,
34033, 10001, 10003, 24015 }; // 0.2387 (23.87%)
// did the same for the second array
const std::vector<int> arr2 { 11001, 24003, 24510, 24005, 24009,
24013, 24017, 24019, 24021, 24025,
24027, 24029, 24031, 24033, 24035,
24037, 24041, 24043, 51510, 51013,
51043, 51047, 51600, 51059, 51610,
51061, 51069, 51630, 51099, 51107,
51683, 51685, 51153, 51157, 51177,
51179, 51187, 51840, 54003, 54027,
54037, 54065, 42001, 42055, 42133 }; //0.2710 (27.10%)
// No changes made here same basic user I/O.
int user_code = 0;
std::cout << "Please enter the Code: ";
std::cin >> user_code;
std::cout << "The value you entered is " << user_code;
std::cout << "\n";
// Created 2 flags for later.
bool b1found = false;
bool b2found = false;
// auto for loop ranged based.
for ( auto code : arr1 ) {
if ( code == user_code ) {
b1found = true; // Set flag
gas = 0.2387f; // Set new gas
// Output code & gas
std::cout << "Code found in Arr1: " << code << '\n';
std::cout << "gas = " << gas << '\n';
}
}
for ( auto code : arr2 ) {
if ( code == user_code ) {
b2found = true; // set flag
gas = 0.2710f; // set gas
// output code & gas
std::cout << "Code found in Arr2: " << code << '\n';
std::cout << "gas = " << gas << '\n';
}
}
// If code not found in either output "not found" and display default gas
if ( !b1found && !b2found ) {
std::cout << "Not found\n";
std::cout << "gas = " << gas << '\n';
}
std::cout << "\nPress any key and enter to quit." << std::endl;
char c;
std::cin >> c;
return 0;
}
You can even simplify this a little more by removing the two bool flags. We know that if a value is found in arr1 or arr2 that the gas value will be changed, So all we really have to do is check to see if it has been changed.
// auto for loop ranged based.
for ( auto code : arr1 ) {
if ( code == user_code ) {
gas = 0.2387f; // Set new gas
// Output code & gas
std::cout << "Code found in Arr1: " << code << '\n';
std::cout << "gas = " << gas << '\n';
}
}
for ( auto code : arr2 ) {
if ( code == user_code ) {
gas = 0.2710f; // set gas
// output code & gas
std::cout << "Code found in Arr2: " << code << '\n';
std::cout << "gas = " << gas << '\n';
}
}
const float defaultGas = 0.1506;
// If code not found in either output "not found" and display default gas
if ( gas == defaultGas ) {
std::cout << "Not found\n";
std::cout << "gas = " << gas << '\n';
}
I'm writing a registry generator as a part of a bigger program. I'm very new in C++, but good at other programming languages like PHP.
I'll start by providing the code of the problematic function:
void generacionAleatoria() {
string r_marca, r_nom, r_apellido;
char r_patente[6];
int num_rand;
registroAuto r_auto;
string nombres[8] = {
"Juan", "Pedro", "Roberto", "Miguel", "Guillermo", "Emilio", "Roque", "Gustavo"
} ;
string apellidos[8] = {
"Messi", "Maradona", "Gardel", "Heredia", "Pimpinela", "Nadal", "Mascherano", "Troilo"
};
string marcas[12] = {
"Volvo", "Renault", "Audi", "Ford", "Fiat", "Chevrolet", "Nissan", "Volkswagen", "Mercedes Benz", "Rolls Royce", "Delorean", "Aston Martin"
};
char letras_patentes[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
char numeros_patentes[] = "0123456789";
for (int i = 0; i < cantidad_autos; i++) {
r_marca = marcas[rand() % (sizeof(marcas)/sizeof(marcas[0]) - 1)];
r_nom = nombres[rand() % (sizeof(nombres)/sizeof(nombres[0]) - 1)];
r_apellido = apellidos[rand() % (sizeof(apellidos)/sizeof(apellidos[0]) - 1)];
for(int m = 0; m < 3; ++m) {
r_patente[m] = letras_patentes[rand() % (sizeof(letras_patentes) - 1)];
}
for(int n = 3; n < 6; n++) {
r_patente[n] = numeros_patentes[rand() % (sizeof(numeros_patentes) - 1)];
}
strcpy(r_auto.patente,r_patente);
strcpy(r_auto.marca,r_marca.c_str());
strcpy(r_auto.apellido,r_apellido.c_str());
strcpy(r_auto.nom,r_nom.c_str());
fwrite(&r_auto,sizeof(registroAuto),1,archivo);
if (ver_variables_testeo) {
//cout << (i+1) << ") " << r_auto.patente<<endl;
cout << (i+1) << ") " << r_auto.marca << " - " << r_auto.patente << " - " << r_auto.nom << " " << r_auto.apellido << endl; //Para testear
}
}
}
This creates 100 structs of the following type:
struct registroAuto {
char marca[15];
char patente[6];
char nom[25];
char apellido[25];
};
In case you're wondering, this is meant to be a registry of Uber drivers and their cars: brand, license plate, name and surname. Well, it's not really a registry, it's college homework.
The problem is that when I print out the contents of my new struct, the license plate and the name will be together, as in:
100) Fiat - KWQ293Maria - Maria Gardel
You can see by the position of the hyphens, that the license plate is now "KWQ293Maria", even though it is an array of 6 chars!
A reminder of the cout command:
cout << (i+1) << ") " << r_auto.marca << " - " << r_auto.patente << " - " << r_auto.nom << " " << r_auto.apellido << endl;
I did some tests, but I don't know what to do with the results.
1: commenting out the strcopy of the name fixes the issue
strcpy(r_auto.patente,r_patente);
strcpy(r_auto.marca,r_marca.c_str());
strcpy(r_auto.apellido,r_apellido.c_str());
//strcpy(r_auto.nom,r_nom.c_str());
As you can see, this is the last of the 4 statements in my original code, so I don't know why it would affect r_auto.patente.
Can you please help me? I'm guessing there's a key concept of char array handling that I missed out on in class :-(
When using character arrays as strings they need to be terminated by a null character '\0'. So when you construct your number-plate you need to make the array 7 characters long.
struct registroAuto {
char marca[15];
char patente[7]; // 6 for numbers, 1 for terminator '\0'
char nom[25];
char apellido[25];
};
Same with your working variable:
char r_patente[7];
And you need to manually add the null-terminator when you create the number:
for(int m = 0; m < 3; ++m) {
r_patente[m] = letras_patentes[rand() % (sizeof(letras_patentes) - 1)];
}
for(int n = 3; n < 6; n++) {
r_patente[n] = numeros_patentes[rand() % (sizeof(numeros_patentes) - 1)];
}
r_patente[6] = '\0'; // add the null terminator
I'm filling out some flatbuffer messages but when I encode then decode them I get junk back out. I've not included the full message to avoid extraneous information, but I'm able to extract the enum value of the union component successfully. However, when I go to extract the type identified by the enum the double array I print out contains junk as illustrated below.
Here are the important parts of the buffers:
Input/Output:
KukaJAVAdriver sending armposition command:[1, 0, 0, 0, 0, 0, 1]
re-extracted 7 joint angles: 0 11 02 03 04 05 06 1
JointState.fbs:
table JointState {
// #todo consider adding name string
position:[double]; // angle in radians
velocity:[double]; // velocity in radians/second
acceleration:[double]; // acceleration in radians/(second^2)
torque:[double]; // Newton Meters (N*m)
}
ArmControlState.fbs:
include "JointState.fbs";
include "Geometry.fbs";
namespace grl.flatbuffer;
table StartArm {
}
table StopArm {
}
table PauseArm {
}
table TeachArm {
}
table ShutdownArm {
}
table MoveArmTrajectory {
traj:[JointState];
}
table MoveArmJointServo {
goal:JointState;
}
table MoveArmCartesianServo {
parent:string; // Object/Frame/Coordinate System to move wrt. Empty default is robot base
goal:Pose;
}
union ArmState { StartArm, StopArm, PauseArm, ShutdownArm, TeachArm, MoveArmTrajectory, MoveArmJointServo, MoveArmCartesianServo }
table ArmControlState {
name:string; // entity to move
sequenceNumber:long;
timeStamp:double;
state:ArmState;
}
encode:
flatbuffers::Offset<flatbuffer::ArmControlState> controlState;
switch (armControlMode_) {
case flatbuffer::ArmState::ArmState_StartArm: {
controlState = flatbuffer::CreateArmControlState(*fbbP,bns,sequenceNumber++,duration,armControlMode_,flatbuffer::CreateStartArm(*fbbP).Union());
break;
}
case flatbuffer::ArmState::ArmState_MoveArmJointServo: {
/// #todo when new
JointScalar armPosVelAccelEmpty;
auto armPositionBuffer = fbbP->CreateVector(armPosition_.data(),armPosition_.size());
auto goalJointState = grl::flatbuffer::CreateJointState(*fbbP,armPositionBuffer);
auto moveArmJointServo = grl::flatbuffer::CreateMoveArmJointServo(*fbbP,goalJointState);
controlState = flatbuffer::CreateArmControlState(*fbbP,bns,sequenceNumber++,duration,armControlMode_,moveArmJointServo.Union());
std::cout << "KukaJAVAdriver sending armposition command:" <<armPosition_<<"\n";
break;
}
//...snip...
}
decode:
auto states = flatbuffer::CreateKUKAiiwaStates(*fbbP,kukaiiwaStateVec);
grl::flatbuffer::FinishKUKAiiwaStatesBuffer(*fbbP, states);
flatbuffers::Verifier verifier(fbbP->GetBufferPointer(),fbbP->GetSize());
BOOST_VERIFY(grl::flatbuffer::VerifyKUKAiiwaStatesBuffer(verifier));
if(armControlMode_ == flatbuffer::ArmState::ArmState_MoveArmJointServo)
{
auto states2 = flatbuffer::GetKUKAiiwaStates(fbbP->GetBufferPointer());
auto movearm = static_cast<const flatbuffer::MoveArmJointServo*>(states2->states()->Get(0)->armControlState()->state());
std::cout << "re-extracted " << movearm->goal()->position()->size() << " joint angles: ";
for(std::size_t i = 0; i < movearm->goal()->position()->size(); ++i)
{
std::cout << i << " " << movearm->goal()->position()->Get(i);
}
std::cout << "\n";
}
kukaJavaDriverP->async_send_flatbuffer(fbbP);
You don't get junk out, the data is actually correct. The bug is in this statement: std::cout << i << " " << movearm->goal()->position()->Get(i);
If instead you wrote something like: std::cout << i << "=" << movearm->goal()->position()->Get(i) << ", "; it be more readable :)
Can anyone instruct me on how the Poco C++ JSON works?
Previously I've used JsonReader and JsonToken. The Poco C++ library doesn't seem to have corresponding objects.
How do I for example use the json parser to create a object name consisting the JSON value at the tag name?
EDIT: as of 1.5.2, things were simplified by making DefaultHandler, well ... default (and renaming it to its proper name - ParseHandler. So, if all you need is parsing, no need to explicitly provide the handler anymore:
// objects
std::string json = "{ \"test\" : { \"property\" : \"value\" } }";
Parser parser;
Var result = parser.parse(json);
Object::Ptr object = result.extract<Object::Ptr>();
Var test = object->get("test");
object = test.extract<Object::Ptr>();
test = object->get("property");
std::string value = test.convert<std::string>();
// array of objects
std::string json = "[ {\"test\" : 0}, { \"test1\" : [1, 2, 3], \"test2\" : 4 } ]";
Parser parser;
Var result = parser.parse(json);
Array::Ptr arr = result.extract<Array::Ptr>();
Object::Ptr object = arr->getObject(0);//
assert (object->getValue<int>("test") == 0);
object = arr->getObject(1);
arr = object->getArray("test1");
result = arr->get(0);
assert (result == 1);
See this answer for more details.
#include <iostream>
#include <string>
#include <Poco/JSON/JSON.h>
#include <Poco/JSON/Parser.h>
#include <Poco/Dynamic/Var.h>
using namespace std;
using namespace Poco::JSON;
string GetValue(Object::Ptr aoJsonObject, const char *aszKey) {
Poco::Dynamic::Var loVariable;
string lsReturn;
string lsKey(aszKey);
// Get the member Variable
//
loVariable = aoJsonObject->get(lsKey);
// Get the Value from the Variable
//
lsReturn = loVariable.convert<std::string>();
return lsReturn;
}
int main(int argc, char *argv[]) {
string lsJson;
Parser loParser;
lsJson = "{\"TransactionCode\":\"000000\",\"FileRecordSequenceNumber\":\"111111\",\"TcrSequenceNumber\":\"222222\",\"TransactionRouteIndicator\":\"ABCDE\",\"MerchantEstablishmentNumber\":\"00000000000\",\"MerchantName\":\"BBBBBBBBB\",\"MerchantCity\":\"CCCCCCCC\"}";
cout << lsJson << endl;
// Parse the JSON and get the Results
//
Poco::Dynamic::Var loParsedJson = loParser.parse(lsJson);
Poco::Dynamic::Var loParsedJsonResult = loParser.result();
// Get the JSON Object
//
Object::Ptr loJsonObject = loParsedJsonResult.extract<Object::Ptr>();
// Get the values for the member variables
//
//
cout << "TransactionCode " << GetValue(loJsonObject, "TransactionCode") << endl;
cout << "FileRecordSequenceNumber " << GetValue(loJsonObject, "FileRecordSequenceNumber") << endl;
cout << "TcrSequenceNumber " << GetValue(loJsonObject, "TcrSequenceNumber") << endl;
cout << "TransactionRouteIndicator " << GetValue(loJsonObject, "TransactionRouteIndicator") << endl;
cout << "MerchantEstablishmentNumber " << GetValue(loJsonObject, "MerchantEstablishmentNumber") << endl;
cout << "MerchantName " << GetValue(loJsonObject, "MerchantName") << endl;
cout << "MerchantCity " << GetValue(loJsonObject, "MerchantCity") << endl;
return 0;
}
Results:
{"TransactionCode":"000000","FileRecordSequenceNumber":"111111","TcrSequenceNumber":"222222","TransactionRouteIndicator":"ABCDE","MerchantEstablishmentNumber":"00000000000","MerchantName":"BBBBBBBBB","MerchantCity":"CCCCCCCC"}
TransactionCode 000000
FileRecordSequenceNumber 111111
TcrSequenceNumber 222222
TransactionRouteIndicator ABCDE
MerchantEstablishmentNumber 00000000000
MerchantName BBBBBBBBB
MerchantCity CCCCCCCC