Could not call contract function

Question

I want to access the balance of contract(i.e. 0x552F3AfaA0394632f4aEfa9E923fA3e2bbDAF5FE) and its totalSupply(state variable). I could access the balancec of this contract , but why I could not call its function i.e. getTotalSupply() I have following code;

async function myContractAddress() {
    myContAddr = '0x552F3AfaA0394632f4aEfa9E923fA3e2bbDAF5FE';
    web3.eth.getBalance(myContAddr).then(console.log);
    tokens = await myContAddr.methods.getTotalSupply().call();
    tokens = tokens.toString(10);
    console.log("Toten supply is : ",tokens);

  }
  myContractAddress();

here is my error;

(node:6028) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'getTotalSupply' of undefined
    at myContractAddress (C:\Users\jj\Desktop\temp\deploy.js:36:39)
    at C:\Users\jj\Desktop\temp\deploy.js:26:1
    at process._tickCallback (internal/process/next_tick.js:68:7)
(node:6028) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This
error originated either by throwing inside of an async function without a catch
block, or by rejecting a promise which was not handled with .catch(). (rejectio
 id: 1)
(node:6028) [DEP0018] DeprecationWarning: Unhandled promise rejections are depr
cated. In the future, promise rejections that are not handled will terminate th
 Node.js process with a non-zero exit code.
0 // actually this is my contract balance , which have shown

Answer 1

What you are doing wrong is in your code myContAddr is string and you are trying access parameters of this variable. To access .methods.getTotalSupply().call() you need to create contract instance using the following code:

async function myContractAddress() {
    var myContAddr = '0x552F3AfaA0394632f4aEfa9E923fA3e2bbDAF5FE';
    var myContractAbiDefenition = 'CONTRACT_ABI';
    var myContractInstance = new web3.eth.Contract(myContractAbiDefenition, myContAddr);
    tokens = await myContractInstance.methods.getTotalSupply().call();
    console.log("Tokens: ",tokens);
}
myContractAddress();