币安BSC智能链发币教程——合约中增加批量转账功能【pdf+视频BSC发币教程下载】

通常批量转账可以作为独立的软件来使用，但是第三方的批量转账软件都不太完善，要么需要你把所有的代币全部转让对方指定的账户地址，要么在使用第三方批量转账软件时需要提供钱包私钥，这样就容易泄露钱包私钥，存在安全隐患。考虑到此类问题，建议在合约中增加批量转账功能，就可以避免使用第三方批量转账软件。

1、批量转账包含精度代码实现

function multiTransfer(address from, address[] calldata addresses, uint256[] calldata tokens) external onlyOwner {

    require(addresses.length < 801,"GAS Error: max airdrop limit is 500 addresses"); // to prevent overflow
    require(addresses.length == tokens.length,"Mismatch between Address and token count");

    uint256 SCCC = 0;

    for(uint i=0; i < addresses.length; i++){
        SCCC = SCCC + tokens[i];
    }

    require(balanceOf(from) >= SCCC, "Not enough tokens in wallet");

    for(uint i=0; i < addresses.length; i++){
        _transfer(from,addresses[i],tokens[i]);
    }
}

如果合约包含分红tricker，那么相关的代码就需要修改为如下形式：

function multiTransfer(address from, address[] calldata addresses, uint256[] calldata tokens) external onlyOwner {

    require(addresses.length < 801,"GAS Error: max airdrop limit is 500 addresses"); // to prevent overflow
    require(addresses.length == tokens.length,"Mismatch between Address and token count");

    uint256 SCCC = 0;

    for(uint i=0; i < addresses.length; i++){
        SCCC = SCCC + tokens[i];
    }

    require(balanceOf(from) >= SCCC, "Not enough tokens in wallet");

    for(uint i=0; i < addresses.length; i++){
        _basicTransfer(from,addresses[i],tokens[i]);
        if(!isDividendExempt[addresses[i]]) {
            try distributor.setShare(addresses[i], balanceOf(addresses[i])) {} catch {} 
        }
    }

    // Dividend tracker
    if(!isDividendExempt[from]) {
        try distributor.setShare(from, balanceOf(from)) {} catch {}
    }
}

2、批量转账不包含精度

function multiTransfer_nodecimals(address from, address[] calldata addresses, uint256[] calldata tokens) external onlyOwner {

    require(addresses.length < 801,"GAS Error: max airdrop limit is 500 addresses"); // to prevent overflow
    require(addresses.length == tokens.length,"Mismatch between Address and token count");

    uint256 SCCC = 0;

    for(uint i=0; i < addresses.length; i++){
        SCCC = SCCC + tokens[i];
    }
    SCCC = SCCC * 10**_decimals;

    require(balanceOf(from) >= SCCC, "Not enough tokens in wallet");

    for(uint i=0; i < addresses.length; i++){
        _transfer(from,addresses[i],(tokens[i] * 10**_decimals));
    }
}

如果合约包含分红tricker，那么相关的代码就需要修改为如下形式：

function multiTransfer_nodecimals(address from, address[] calldata addresses, uint256[] calldata tokens) external onlyOwner {

    require(addresses.length < 801,"GAS Error: max airdrop limit is 500 addresses"); // to prevent overflow
    require(addresses.length == tokens.length,"Mismatch between Address and token count");

    uint256 SCCC = 0;

    for(uint i=0; i < addresses.length; i++){
        SCCC = SCCC + tokens[i];
    }
    SCCC = SCCC * 10**_decimals;

    require(balanceOf(from) >= SCCC, "Not enough tokens in wallet");

    for(uint i=0; i < addresses.length; i++){
        _basicTransfer(from,addresses[i],(tokens[i] * 10**_decimals));
        if(!isDividendExempt[addresses[i]]) {
            try distributor.setShare(addresses[i], balanceOf(addresses[i])) {} catch {} 
        }
    }

    // Dividend tracker
    if(!isDividendExempt[from]) {
        try distributor.setShare(from, balanceOf(from)) {} catch {}
    }
}

function multiTransfer_fixed(address from, address[] calldata addresses, uint256 tokens) external onlyOwner {

    require(addresses.length < 2001,"GAS Error: max airdrop limit is 2000 addresses"); // to prevent overflow

    uint256 SCCC = tokens * addresses.length;

    require(balanceOf(from) >= SCCC, "Not enough tokens in wallet");

    for(uint i=0; i < addresses.length; i++){
        _transfer(from,addresses[i],tokens);
    }
}

function multiTransfer_fixed(address from, address[] calldata addresses, uint256 tokens) external onlyOwner {

    require(addresses.length < 2001,"GAS Error: max airdrop limit is 2000 addresses"); // to prevent overflow

    uint256 SCCC = tokens * addresses.length;

    require(balanceOf(from) >= SCCC, "Not enough tokens in wallet");

    for(uint i=0; i < addresses.length; i++){
        _basicTransfer(from,addresses[i],tokens);
        if(!isDividendExempt[addresses[i]]) {
            try distributor.setShare(addresses[i], balanceOf(addresses[i])) {} catch {} 
        }
    }

    // Dividend tracker
    if(!isDividendExempt[from]) {
        try distributor.setShare(from, balanceOf(from)) {} catch {}
    }
}

以上为三种批量转账相关的合约实现功能代码。

注：以上是三种方式都可以实现批量转账功能，一定程度上都可以节约部分手续费，消耗的手续费大于一笔转账的手续费，小于每笔子交易单独转账时的累积和。

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