59 lines
1.8 KiB
C++
59 lines
1.8 KiB
C++
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#include "StdAfx.h"
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#include "Etherscan.h"
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#pragma comment (lib, "wininet.lib")
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using namespace FemboyBanking;
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using namespace rapidjson;
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using namespace System;
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using namespace System::ComponentModel;
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using namespace System::Windows::Forms;
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UInt64 Etherscan::FetchLinkBalance(String^ address, BackgroundWorker^ worker, DoWorkEventArgs^ e)
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{
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HINTERNET connect = InternetOpenA("EtherscanQuery", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
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if (!connect)
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{
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MessageBox::Show( dynamic_cast<Form^>(worker->Container), "Failed to open Internet handle", "Network Error", MessageBoxButtons::OK, MessageBoxIcon::Error);
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return -1;
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}
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worker->ReportProgress(25);
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char url[256];
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sprintf_s(url, sizeof(url), Etherscan::BALANCE_URL_FMT, Etherscan::LINK_CONTRACT, address);
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HINTERNET OpenAddress = InternetOpenUrlA(connect, url, NULL, 0, INTERNET_FLAG_PRAGMA_NOCACHE | INTERNET_FLAG_KEEP_CONNECTION, 0);
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if (!OpenAddress)
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{
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DWORD err = GetLastError();
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MessageBox::Show( dynamic_cast<Form^>(worker->Container), String::Format("Failed to open URL, error {0}", err), "Network Error", MessageBoxButtons::OK, MessageBoxIcon::Error );
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InternetCloseHandle(connect);
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return -1;
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}
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worker->ReportProgress(50);
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char DataReceived[4096];
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char* temp = DataReceived;
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DWORD NumberOfBytesRead = 0;
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while ( InternetReadFile(OpenAddress, DataReceived, sizeof(DataReceived), &NumberOfBytesRead) && NumberOfBytesRead )
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{
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temp += NumberOfBytesRead;
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}
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*temp = '\0';
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worker->ReportProgress(75);
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Document response;
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response.Parse(DataReceived);
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worker->ReportProgress(90);
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if (response.HasMember("error"))
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{
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return -1;
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}
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InternetCloseHandle(OpenAddress);
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InternetCloseHandle(connect);
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worker->ReportProgress(100);
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String^ balance = gcnew String(response["result"].GetString());
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return UInt64::Parse(balance);
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}
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