Topic: How to create block query tool (python/c++)? (Read 1598 times)

from sys import path
path.append('..')   # I'm running this from the cppForSwig directory
from pybtcengine import *
from datetime import datetime
from BlockUtils import *

# Create the BlockDataManager, scan the chain, organize the block headers
bdm = BlockDataManager_FullRAM.GetInstance()
bdm.readBlkFile_FromScratch('../blk0001.dat')  # point this to your blkfile!!!
bdm.organizeChain();

# At this point all blockheaders and txs are loaded into memory. 
# Can access instantaneously by hash or by height
# Get block 100,014 because it's got 6 diverse Tx
someBlk = bdm.getHeaderByHeight(100014)

# A helper method to convert header times to a pretty format
def unixTimeToFormatStr(unixTime, formatStr='%Y-%b-%d %I:%M%p'):
   dtobj = datetime.fromtimestamp(unixTime)
   dtstr = dtobj.strftime(formatStr)
   return dtstr[:-2] + dtstr[-2:].lower()

# Another helper to convert raw, 20-byte address values to Base58
def hash160ToAddr(hash160):
   b = PyBtcAddress().createFromPublicKeyHash160(hash160)
   return b.getAddrStr()

# Going to print senders, receivers
print 'TxList for block #', someBlk.getBlockHeight()
topTxPtrList = someBlk.getTxRefPtrList()
print 'NumTx:', len(topTxPtrList)
for txptr in topTxPtrList:

   # We print big-endian because we like to to be able to put it in BlockExplorer to verify
   print '\nTx:', binary_to_hex(txptr.getThisHash().toString(), BIGENDIAN)[:16],

   # Each Tx has a pointer to the header of the block it's included in
   blkHead = txptr.getHeaderPtr()
   print 'Blk:', blkHead.getBlockHeight(),
   print 'Timestamp:', unixTimeToFormatStr(blkHead.getTimestamp())

   # Print the TxIns
   for i in range(nIn):
      txin = txptr.getTxInRef(i)
      if txin.isCoinbase():
         print '\tSender:', ''.center(34),
         print 'Value: 50 [probably]';
      else:
         print '\tSender:', hash160ToAddr(bdm.getSenderAddr20(txin).toString()),
         print 'Value:',  coin2str(bdm.getSentValue(txin))
         
   # Print the TxOuts
   for i in range(nOut):
      txout = txptr.getTxOutRef(i)
      print '\tRecip: ', hash160ToAddr(txout.getRecipientAddr().toString()),
      print 'Value:', coin2str(txout.getValue())