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Pack parameters example
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#include <eosio/eosio.hpp> | |
#include <eosio/asset.hpp> | |
using namespace eosio; | |
using namespace std; | |
class test: public contract { | |
public: | |
using contract::contract; | |
/** | |
* pack parameters | |
*/ | |
[[eosio::action]] | |
void usepack(name from, name to, asset quantity, string memo) { | |
vector<char> packed = eosio::pack(std::make_tuple(from, to, quantity, memo)); | |
printhex(packed.data(), packed.size()); | |
} | |
[[eosio::action]] | |
void usestream(name from, name to, asset quantity, string memo) { | |
char buf[512]; | |
datastream<char*> ds(buf, sizeof(buf)); | |
ds << from; | |
ds << to; | |
ds << quantity; | |
ds << memo; | |
vector<char> packed = {buf, buf + ds.tellp()}; | |
printhex(packed.data(), packed.size()); | |
} | |
/** | |
* unpack parameters | |
*/ | |
struct transfer { | |
name from; | |
name to; | |
asset quantity; | |
string memo; | |
}; | |
[[eosio::action]] | |
void useunpack(vector<char> packed) { | |
auto unpacked = eosio::unpack<transfer>(packed); | |
print(unpacked.from, unpacked.to, unpacked.quantity, unpacked.memo); | |
} | |
[[eosio::action]] | |
void usestream2(vector<char> packed) { | |
name from; | |
name to; | |
asset quantity; | |
string memo; | |
datastream<char*> ds(packed.data(), packed.size()); | |
ds >> from; | |
ds >> to; | |
ds >> quantity; | |
ds >> memo; | |
print(from, to, quantity, memo); | |
} | |
}; |
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