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Deploying and invoking contract

In the previous section we have compiled an NEP17 contract file (NEP17.nef) and contract descriptive file (NEP17.manifest.json), next we will move on to deployment and invocation of the contract with Neo-CLI.

Deploying contract#

In Neo-CLI, input the deploy command deploy <nefFilePath> [manifestFile] , for example:

deploy NEP17.nef

Or

deploy NEP17.nef NEP17.manifest.json

After the command is executed, the NEP17 contract is deployed and the related fee is charged by the system automatically.

neo> deploy NEP17.nefScript hash: 0xb7f4d011241ec13db16c0e3484bdd5dd9a536f26Gas: 10.1477624
Signed and relayed transaction with hash=0xe03aade81fb96c44e115a1cc9cfe984a9df4a283bd10aa0aefa7ebf3e296f757

For more information, refer to Deploying Smart Contracts.

Invoking contract#

Now we can invoke the contract using the Neo-CLI command invoke:

invoke <scriptHash> <operation> [contractParameters=null] [witnessAddress=null]

For example:

invoke 0xb7f4d011241ec13db16c0e3484bdd5dd9a536f26 symbol

After executed successfully, the following information is printed：

Invoking script with: '10c00c046e616d650c14f9f81497c3f9b62ba93f73c711d41b1eeff50c2341627d5b52'VM State: HALTGas Consumed: 0.0103609Evaluation Stack: [{"type":"ByteArray","value":"VG9rZW5TeW1ib2w="}]
relay tx(no|yes):

Where:

  • VM State: HALT indicates the vm executed successfully; FAULT indicates the vm exited during execution due to an exception.
  • Evaluation Stack: the result of contract execution, where the value is encoded with Base64 when it is a string or ByteArray.
  • You can do the data format conversion here VG9rZW5TeW1ib2w= => TokenSymbol

For more information, refer to Invoking Smart Contracts.