Solidity! Invalid implicit conversion from string memory to bytes memory requested The Next...
How do I transpose the first and deepest levels of an arbitrarily nested array?
Won the lottery - how do I keep the money?
How to safely derail a train during transit?
Elegant way to replace substring in a regex with optional groups in Python?
Is micro rebar a better way to reinforce concrete than rebar?
Example of a Mathematician/Physicist whose Other Publications during their PhD eclipsed their PhD Thesis
If Nick Fury and Coulson already knew about aliens (Kree and Skrull) why did they wait until Thor's appearance to start making weapons?
What happened in Rome, when the western empire "fell"?
What was the first Unix version to run on a microcomputer?
How long to clear the 'suck zone' of a turbofan after start is initiated?
Novel about a guy who is possessed by the divine essence and the world ends?
Return the Closest Prime Number
Why do airplanes bank sharply to the right after air-to-air refueling?
Is it ever safe to open a suspicious html file (e.g. email attachment)?
How do scammers retract money, while you can’t?
To not tell, not take, and not want
What connection does MS Office have to Netscape Navigator?
Is "for causing autism in X" grammatical?
Is there a difference between "Fahrstuhl" and "Aufzug"
Is it professional to write unrelated content in an almost-empty email?
Multiple labels for a single equation
What happens if you roll doubles 3 times then land on "Go to jail?"
How to count occurrences of text in a file?
Is it possible to search for a directory/file combination?
Solidity! Invalid implicit conversion from string memory to bytes memory requested
The Next CEO of Stack OverflowWhen to use “View” and “Pure” in place of “Constant”API to “Read Contract Information” to fetch stats of an ICOHow can I split a 56 character input and store them in two Bytes32?Calling mapping (uint ==> bytes32)return 0x0000000This contract does not implement all functions and thus cannot be createdTypeError: This type is only supported in the new experimental ABI encoderHow is gas adjusted for a transfer in solidity?How to handle dynamic size string array in solidity?remix ERC223: This contract does not implement all functions and thus cannot be createdInvalid implicit conversion from bytes32 to bytes memory requestedInvalid implicit conversion from uint256 to bytes memory requested
pragma solidity ^0.5
contract ProofOfExistence {
// ... some code here
function proofFor(string memory document) public view returns(bytes32) {
return sha256(document);
}
// ... some more code here
}
Gives following error :
TypeError: Invalid type for argument in function call. Invalid
implicit conversion from string memory to bytes memory requested.
I am unable to understand why this error is coming.
UPDATE :
pragma solidity ^0.5;
// Proof of Existence contract, version 3
contract ProofOfExistence3 {
mapping (bytes32 => bool) private proofs;
// store a proof of existence in the contract state
function storeProof(bytes32 proof) public{
proofs[proof] = true;
}
// calculate and store the proof for a document
function notarize(string memory document) public {
**bytes32 proof = proofFor(document);**
storeProof(proof);
}
// helper function to get a document's sha256
function proofFor(bytes memory document) public pure returns (bytes32) {
return sha256(document);
}
// check if a document has been notarized
function checkDocument(string memory document) view public returns (bool) {
**bytes32 proof = proofFor(document);**
return hasProof(proof);
}
// returns true if proof is stored
function hasProof(bytes32 proof) view public returns(bool) {
return proofs[proof];
UPDATE ERROR After the update as suggested I am getting the same error but on the lines having ** ...** this time. Why is it coming now?
Thanks
solidity error string bytes data-types
asked 1 hour ago
Khalid168Khalid168
184
New contributor
Khalid168 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
pragma solidity ^0.5
contract ProofOfExistence {
// ... some code here
function proofFor(string memory document) public view returns(bytes32) {
return sha256(document);
}
// ... some more code here
}
Gives following error :
TypeError: Invalid type for argument in function call. Invalid
implicit conversion from string memory to bytes memory requested.
I am unable to understand why this error is coming.
UPDATE :
pragma solidity ^0.5;
// Proof of Existence contract, version 3
contract ProofOfExistence3 {
mapping (bytes32 => bool) private proofs;
// store a proof of existence in the contract state
function storeProof(bytes32 proof) public{
proofs[proof] = true;
}
// calculate and store the proof for a document
function notarize(string memory document) public {
**bytes32 proof = proofFor(document);**
storeProof(proof);
}
// helper function to get a document's sha256
function proofFor(bytes memory document) public pure returns (bytes32) {
return sha256(document);
}
// check if a document has been notarized
function checkDocument(string memory document) view public returns (bool) {
**bytes32 proof = proofFor(document);**
return hasProof(proof);
}
// returns true if proof is stored
function hasProof(bytes32 proof) view public returns(bool) {
return proofs[proof];
UPDATE ERROR After the update as suggested I am getting the same error but on the lines having ** ...** this time. Why is it coming now?
Thanks
solidity error string bytes data-types
asked 1 hour ago
Khalid168Khalid168
184
New contributor
Khalid168 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
2
It's better if you can copy-paste your code, rather than attaching a screenshot
– Achala Dissanayake
1 hour ago
add a comment |
pragma solidity ^0.5
contract ProofOfExistence {
// ... some code here
function proofFor(string memory document) public view returns(bytes32) {
return sha256(document);
}
// ... some more code here
}
Gives following error :
TypeError: Invalid type for argument in function call. Invalid
implicit conversion from string memory to bytes memory requested.
I am unable to understand why this error is coming.
UPDATE :
pragma solidity ^0.5;
// Proof of Existence contract, version 3
contract ProofOfExistence3 {
mapping (bytes32 => bool) private proofs;
// store a proof of existence in the contract state
function storeProof(bytes32 proof) public{
proofs[proof] = true;
}
// calculate and store the proof for a document
function notarize(string memory document) public {
**bytes32 proof = proofFor(document);**
storeProof(proof);
}
// helper function to get a document's sha256
function proofFor(bytes memory document) public pure returns (bytes32) {
return sha256(document);
}
// check if a document has been notarized
function checkDocument(string memory document) view public returns (bool) {
**bytes32 proof = proofFor(document);**
return hasProof(proof);
}
// returns true if proof is stored
function hasProof(bytes32 proof) view public returns(bool) {
return proofs[proof];
UPDATE ERROR After the update as suggested I am getting the same error but on the lines having ** ...** this time. Why is it coming now?
Thanks
solidity error string bytes data-types
asked 1 hour ago
Khalid168Khalid168
184
New contributor
Khalid168 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
pragma solidity ^0.5
contract ProofOfExistence {
// ... some code here
function proofFor(string memory document) public view returns(bytes32) {
return sha256(document);
}
// ... some more code here
}
Gives following error :
TypeError: Invalid type for argument in function call. Invalid
implicit conversion from string memory to bytes memory requested.
I am unable to understand why this error is coming.
UPDATE :
pragma solidity ^0.5;
// Proof of Existence contract, version 3
contract ProofOfExistence3 {
mapping (bytes32 => bool) private proofs;
// store a proof of existence in the contract state
function storeProof(bytes32 proof) public{
proofs[proof] = true;
}
// calculate and store the proof for a document
function notarize(string memory document) public {
**bytes32 proof = proofFor(document);**
storeProof(proof);
}
// helper function to get a document's sha256
function proofFor(bytes memory document) public pure returns (bytes32) {
return sha256(document);
}
// check if a document has been notarized
function checkDocument(string memory document) view public returns (bool) {
**bytes32 proof = proofFor(document);**
return hasProof(proof);
}
// returns true if proof is stored
function hasProof(bytes32 proof) view public returns(bool) {
return proofs[proof];
UPDATE ERROR After the update as suggested I am getting the same error but on the lines having ** ...** this time. Why is it coming now?
Thanks
solidity error string bytes data-types
solidity error string bytes data-types
asked 1 hour ago
Khalid168Khalid168
184
New contributor
Khalid168 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 hour ago
Khalid168Khalid168
184
New contributor
Khalid168 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 27 mins ago
Khalid168
asked 1 hour ago
Khalid168Khalid168
184
New contributor
Khalid168 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 hour ago
Khalid168Khalid168
184
asked 1 hour ago
Khalid168Khalid168
184
184
New contributor
Khalid168 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Khalid168 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Khalid168 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
2
It's better if you can copy-paste your code, rather than attaching a screenshot
– Achala Dissanayake
1 hour ago
add a comment |
2
It's better if you can copy-paste your code, rather than attaching a screenshot
– Achala Dissanayake
1 hour ago
2
2
It's better if you can copy-paste your code, rather than attaching a screenshot
– Achala Dissanayake
1 hour ago
It's better if you can copy-paste your code, rather than attaching a screenshot
– Achala Dissanayake
1 hour ago
add a comment |
2 Answers
2
active
oldest
votes
Argument to sha256 should be in bytes. But you're passing document which is a string. Following would work.
function proofFor(bytes memory document) public pure returns(bytes32) {
return sha256(document);
}
And a side note - your function doesn't need to be view type since it is not viewing any storage items. This can be made a pure function which has neither side effects nor storage viewing. More details can be found here.
UPDATE :
If changing string to bytes gives errors at other function calls you can either convert them to bytes as well or else you can cast string to bytes as @Mikhail suggested. Then that would be;
function proofFor(string memory document) public pure returns(bytes32) {
return sha256(bytes (document));
}
answered 1 hour ago
Achala DissanayakeAchala Dissanayake
3,78781629
Thanks for the quick response! after changing the code as u suggested I am getting errors in the other part.
– Khalid168
44 mins ago
pragma solidity ^0.5; // Proof of Existence contract, version 3 contract ProofOfExistence3 { mapping (bytes32 => bool) private proofs; // store a proof of existence in the contract state function storeProof(bytes32 proof) public{ proofs[proof] = true; } // calculate and store the proof for a document function notarize(string memory document) public { bytes32 proof = proofFor(document); storeProof(proof); }
– Khalid168
43 mins ago
I have added the code but seems quite ugly here!
– Khalid168
39 mins ago
1
Thanks a lot for the guidance...Now the problem is solved!
– Khalid168
23 mins ago
1
Yeah done now !
– Khalid168
18 mins ago
|
show 1 more comment
Should probably be
return sha256(bytes (document));
answered 34 mins ago
Mikhail VladimirovMikhail Vladimirov
1,003314
Thanks a lot for help ! It's solved like this
– Khalid168
23 mins ago
add a comment |
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "642"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Khalid168 is a new contributor. Be nice, and check out our Code of Conduct.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fethereum.stackexchange.com%2fquestions%2f69055%2fsolidity-invalid-implicit-conversion-from-string-memory-to-bytes-memory-request%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Argument to sha256 should be in bytes. But you're passing document which is a string. Following would work.
function proofFor(bytes memory document) public pure returns(bytes32) {
return sha256(document);
}
And a side note - your function doesn't need to be view type since it is not viewing any storage items. This can be made a pure function which has neither side effects nor storage viewing. More details can be found here.
UPDATE :
If changing string to bytes gives errors at other function calls you can either convert them to bytes as well or else you can cast string to bytes as @Mikhail suggested. Then that would be;
function proofFor(string memory document) public pure returns(bytes32) {
return sha256(bytes (document));
}
answered 1 hour ago
Achala DissanayakeAchala Dissanayake
3,78781629
Thanks for the quick response! after changing the code as u suggested I am getting errors in the other part.
– Khalid168
44 mins ago
pragma solidity ^0.5; // Proof of Existence contract, version 3 contract ProofOfExistence3 { mapping (bytes32 => bool) private proofs; // store a proof of existence in the contract state function storeProof(bytes32 proof) public{ proofs[proof] = true; } // calculate and store the proof for a document function notarize(string memory document) public { bytes32 proof = proofFor(document); storeProof(proof); }
– Khalid168
43 mins ago
I have added the code but seems quite ugly here!
– Khalid168
39 mins ago
1
Thanks a lot for the guidance...Now the problem is solved!
– Khalid168
23 mins ago
1
Yeah done now !
– Khalid168
18 mins ago
|
show 1 more comment
Argument to sha256 should be in bytes. But you're passing document which is a string. Following would work.
function proofFor(bytes memory document) public pure returns(bytes32) {
return sha256(document);
}
And a side note - your function doesn't need to be view type since it is not viewing any storage items. This can be made a pure function which has neither side effects nor storage viewing. More details can be found here.
UPDATE :
If changing string to bytes gives errors at other function calls you can either convert them to bytes as well or else you can cast string to bytes as @Mikhail suggested. Then that would be;
function proofFor(string memory document) public pure returns(bytes32) {
return sha256(bytes (document));
}
answered 1 hour ago
Achala DissanayakeAchala Dissanayake
3,78781629
Thanks for the quick response! after changing the code as u suggested I am getting errors in the other part.
– Khalid168
44 mins ago
pragma solidity ^0.5; // Proof of Existence contract, version 3 contract ProofOfExistence3 { mapping (bytes32 => bool) private proofs; // store a proof of existence in the contract state function storeProof(bytes32 proof) public{ proofs[proof] = true; } // calculate and store the proof for a document function notarize(string memory document) public { bytes32 proof = proofFor(document); storeProof(proof); }
– Khalid168
43 mins ago
I have added the code but seems quite ugly here!
– Khalid168
39 mins ago
1
Thanks a lot for the guidance...Now the problem is solved!
– Khalid168
23 mins ago
1
Yeah done now !
– Khalid168
18 mins ago
|
show 1 more comment
Argument to sha256 should be in bytes. But you're passing document which is a string. Following would work.
function proofFor(bytes memory document) public pure returns(bytes32) {
return sha256(document);
}
And a side note - your function doesn't need to be view type since it is not viewing any storage items. This can be made a pure function which has neither side effects nor storage viewing. More details can be found here.
UPDATE :
If changing string to bytes gives errors at other function calls you can either convert them to bytes as well or else you can cast string to bytes as @Mikhail suggested. Then that would be;
function proofFor(string memory document) public pure returns(bytes32) {
return sha256(bytes (document));
}
answered 1 hour ago
Achala DissanayakeAchala Dissanayake
3,78781629
Argument to sha256 should be in bytes. But you're passing document which is a string. Following would work.
function proofFor(bytes memory document) public pure returns(bytes32) {
return sha256(document);
}
And a side note - your function doesn't need to be view type since it is not viewing any storage items. This can be made a pure function which has neither side effects nor storage viewing. More details can be found here.
UPDATE :
If changing string to bytes gives errors at other function calls you can either convert them to bytes as well or else you can cast string to bytes as @Mikhail suggested. Then that would be;
function proofFor(string memory document) public pure returns(bytes32) {
return sha256(bytes (document));
}
answered 1 hour ago
Achala DissanayakeAchala Dissanayake
3,78781629
edited 21 mins ago
answered 1 hour ago
Achala DissanayakeAchala Dissanayake
3,78781629
answered 1 hour ago
Achala DissanayakeAchala Dissanayake
3,78781629
answered 1 hour ago
Achala DissanayakeAchala Dissanayake
3,78781629
3,78781629
Thanks for the quick response! after changing the code as u suggested I am getting errors in the other part.
– Khalid168
44 mins ago
pragma solidity ^0.5; // Proof of Existence contract, version 3 contract ProofOfExistence3 { mapping (bytes32 => bool) private proofs; // store a proof of existence in the contract state function storeProof(bytes32 proof) public{ proofs[proof] = true; } // calculate and store the proof for a document function notarize(string memory document) public { bytes32 proof = proofFor(document); storeProof(proof); }
– Khalid168
43 mins ago
I have added the code but seems quite ugly here!
– Khalid168
39 mins ago
1
Thanks a lot for the guidance...Now the problem is solved!
– Khalid168
23 mins ago
1
Yeah done now !
– Khalid168
18 mins ago
|
show 1 more comment
Thanks for the quick response! after changing the code as u suggested I am getting errors in the other part.
– Khalid168
44 mins ago
pragma solidity ^0.5; // Proof of Existence contract, version 3 contract ProofOfExistence3 { mapping (bytes32 => bool) private proofs; // store a proof of existence in the contract state function storeProof(bytes32 proof) public{ proofs[proof] = true; } // calculate and store the proof for a document function notarize(string memory document) public { bytes32 proof = proofFor(document); storeProof(proof); }
– Khalid168
43 mins ago
I have added the code but seems quite ugly here!
– Khalid168
39 mins ago
1
Thanks a lot for the guidance...Now the problem is solved!
– Khalid168
23 mins ago
1
Yeah done now !
– Khalid168
18 mins ago
Thanks for the quick response! after changing the code as u suggested I am getting errors in the other part.
– Khalid168
44 mins ago
Thanks for the quick response! after changing the code as u suggested I am getting errors in the other part.
– Khalid168
44 mins ago
pragma solidity ^0.5; // Proof of Existence contract, version 3 contract ProofOfExistence3 { mapping (bytes32 => bool) private proofs; // store a proof of existence in the contract state function storeProof(bytes32 proof) public{ proofs[proof] = true; } // calculate and store the proof for a document function notarize(string memory document) public { bytes32 proof = proofFor(document); storeProof(proof); }
– Khalid168
43 mins ago
pragma solidity ^0.5; // Proof of Existence contract, version 3 contract ProofOfExistence3 { mapping (bytes32 => bool) private proofs; // store a proof of existence in the contract state function storeProof(bytes32 proof) public{ proofs[proof] = true; } // calculate and store the proof for a document function notarize(string memory document) public { bytes32 proof = proofFor(document); storeProof(proof); }
– Khalid168
43 mins ago
I have added the code but seems quite ugly here!
– Khalid168
39 mins ago
I have added the code but seems quite ugly here!
– Khalid168
39 mins ago
1
1
Thanks a lot for the guidance...Now the problem is solved!
– Khalid168
23 mins ago
Thanks a lot for the guidance...Now the problem is solved!
– Khalid168
23 mins ago
1
1
Yeah done now !
– Khalid168
18 mins ago
Yeah done now !
– Khalid168
18 mins ago
|
show 1 more comment
Should probably be
return sha256(bytes (document));
answered 34 mins ago
Mikhail VladimirovMikhail Vladimirov
1,003314
Thanks a lot for help ! It's solved like this
– Khalid168
23 mins ago
add a comment |
Should probably be
return sha256(bytes (document));
answered 34 mins ago
Mikhail VladimirovMikhail Vladimirov
1,003314
Thanks a lot for help ! It's solved like this
– Khalid168
23 mins ago
add a comment |
Should probably be
return sha256(bytes (document));
answered 34 mins ago
Mikhail VladimirovMikhail Vladimirov
1,003314
Should probably be
return sha256(bytes (document));
answered 34 mins ago
Mikhail VladimirovMikhail Vladimirov
1,003314
answered 34 mins ago
Mikhail VladimirovMikhail Vladimirov
1,003314
answered 34 mins ago
Mikhail VladimirovMikhail Vladimirov
1,003314
answered 34 mins ago
Mikhail VladimirovMikhail Vladimirov
1,003314
1,003314
Thanks a lot for help ! It's solved like this
– Khalid168
23 mins ago
add a comment |
Thanks a lot for help ! It's solved like this
– Khalid168
23 mins ago
Thanks a lot for help ! It's solved like this
– Khalid168
23 mins ago
Thanks a lot for help ! It's solved like this
– Khalid168
23 mins ago
add a comment |
Khalid168 is a new contributor. Be nice, and check out our Code of Conduct.
Khalid168 is a new contributor. Be nice, and check out our Code of Conduct.
Khalid168 is a new contributor. Be nice, and check out our Code of Conduct.
Khalid168 is a new contributor. Be nice, and check out our Code of Conduct.
Thanks for contributing an answer to Ethereum Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fethereum.stackexchange.com%2fquestions%2f69055%2fsolidity-invalid-implicit-conversion-from-string-memory-to-bytes-memory-request%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
2
It's better if you can copy-paste your code, rather than attaching a screenshot
– Achala Dissanayake
1 hour ago