How to use Solidity interface

This article mainly explains "how to use Solidity interface". Friends who are interested might as well take a look. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn how to use Solidity interface.

Ethernet Network distinguishes between reading and writing data on the network. Writing data is called transaction and reading data is called call.

Use tools: remix IDE-browser-based scenario: two contracts are deployed at different addresses, and data interaction is called between each other.

The first contract: Doug.sol code is as follows:

Pragma solidity ^ 0.4.19 X contract Doug {mapping (bytes32 = > uint) public contracts; function Doug () {contracts ['hww'] = 1; contracts [' brian'] = 2; contracts ['zzy'] = 7;} function getDougName (string _ name) public view returns (string) {return _ name } function getDougAge (uint _ age) public pure returns (uint) {return 3 * * _ age;}}

The second contract myContract.sol code is as follows:

Pragma solidity ^ 0.4.19 X contract DogInterface {function getDougAge (uint _ age) returns (uint); function contracts (bytes32 name) returns (uint);} contract main {event FetchContract (address dogInterfaceAddress, address sender, bytes32 name); address DOUG; address dogInterfaceAddress = 0x3e6494333ae0e929ade0eb9a19fb02632b8e07cf; DogInterface dogContract = DogInterface (dogInterfaceAddress); function setDOUG (address _ doug) {DOUG = _ doug } function dougOfage (uint _ age) public view returns (uint) {uint num = dogContract.getDougAge (_ age); return _ age+num; / / return num;} function uintOfName (bytes32 _ name) returns (uint) {dogContract.contracts (_ name); FetchContract (dogInterfaceAddress, msg.sender, _ name) } / / function getTest (string _ name) public view returns (string) {/ / string memory newName = _ name; / / DogInterface (DOUG) .getDougName (newName); / / return newName; / /}}

Execution result:

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