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I am using argument encoding from this page (https://github.com/ethereum/wiki/wiki/Ethereum-Contract-ABI) to build data field for offline signing. I am using eth.sendRawTransaction to call a function in my deployed smart contract. Everything is working fine when the functions have arguments (1 or more), but I am getting an "invalid opcode" exception for the functions which have no arguments. I am using just the first four bytes of the function selector (i.e, sha3('myFunc()')) since there are no arguments.

These functions are working fine when I use a dummy argument (keeping the rest same).

Is there a special way to handle functions without arguments ?

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I cracked this one by sending the contract bytecode as the data field and {value:"0x0"} to execute the empty constructor.

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