Solidity! Invalid implicit conversion from string memory to bytes memory requested The Next...
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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”Car Rental System Compile ErrorHow to type-cast a function pointer in Solidity?Need help with the following type for agrument in function call:Invalid implicit conversion from address to contractTypeError: This type is only supported in the new experimental ABI encoderHow to handle dynamic size string array in solidity?Solidity: data type conversion from bytes to address/string/uint/int [ any library available? ]Invalid implicit conversion from bytes32 to bytes memory requestedHow to compare two bytes32?Invalid 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 14 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
30 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
29 mins ago
I have added the code but seems quite ugly here!
– Khalid168
26 mins ago
1
Thanks a lot for the guidance...Now the problem is solved!
– Khalid168
9 mins ago
1
Yeah done now !
– Khalid168
4 mins ago
|
show 1 more comment
Should probably be
return sha256(bytes (document));
answered 21 mins ago
Mikhail VladimirovMikhail Vladimirov
1,003314
Thanks a lot for help ! It's solved like this
– Khalid168
9 mins ago
add a comment |
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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
30 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
29 mins ago
I have added the code but seems quite ugly here!
– Khalid168
26 mins ago
1
Thanks a lot for the guidance...Now the problem is solved!
– Khalid168
9 mins ago
1
Yeah done now !
– Khalid168
4 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
30 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
29 mins ago
I have added the code but seems quite ugly here!
– Khalid168
26 mins ago
1
Thanks a lot for the guidance...Now the problem is solved!
– Khalid168
9 mins ago
1
Yeah done now !
– Khalid168
4 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 7 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
30 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
29 mins ago
I have added the code but seems quite ugly here!
– Khalid168
26 mins ago
1
Thanks a lot for the guidance...Now the problem is solved!
– Khalid168
9 mins ago
1
Yeah done now !
– Khalid168
4 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
30 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
29 mins ago
I have added the code but seems quite ugly here!
– Khalid168
26 mins ago
1
Thanks a lot for the guidance...Now the problem is solved!
– Khalid168
9 mins ago
1
Yeah done now !
– Khalid168
4 mins ago
Thanks for the quick response! after changing the code as u suggested I am getting errors in the other part.
– Khalid168
30 mins ago
Thanks for the quick response! after changing the code as u suggested I am getting errors in the other part.
– Khalid168
30 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
29 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
29 mins ago
I have added the code but seems quite ugly here!
– Khalid168
26 mins ago
I have added the code but seems quite ugly here!
– Khalid168
26 mins ago
1
1
Thanks a lot for the guidance...Now the problem is solved!
– Khalid168
9 mins ago
Thanks a lot for the guidance...Now the problem is solved!
– Khalid168
9 mins ago
1
1
Yeah done now !
– Khalid168
4 mins ago
Yeah done now !
– Khalid168
4 mins ago
|
show 1 more comment
Should probably be
return sha256(bytes (document));
answered 21 mins ago
Mikhail VladimirovMikhail Vladimirov
1,003314
Thanks a lot for help ! It's solved like this
– Khalid168
9 mins ago
add a comment |
Should probably be
return sha256(bytes (document));
answered 21 mins ago
Mikhail VladimirovMikhail Vladimirov
1,003314
Thanks a lot for help ! It's solved like this
– Khalid168
9 mins ago
add a comment |
Should probably be
return sha256(bytes (document));
answered 21 mins ago
Mikhail VladimirovMikhail Vladimirov
1,003314
Should probably be
return sha256(bytes (document));
answered 21 mins ago
Mikhail VladimirovMikhail Vladimirov
1,003314
answered 21 mins ago
Mikhail VladimirovMikhail Vladimirov
1,003314
answered 21 mins ago
Mikhail VladimirovMikhail Vladimirov
1,003314
answered 21 mins ago
Mikhail VladimirovMikhail Vladimirov
1,003314
1,003314
Thanks a lot for help ! It's solved like this
– Khalid168
9 mins ago
add a comment |
Thanks a lot for help ! It's solved like this
– Khalid168
9 mins ago
Thanks a lot for help ! It's solved like this
– Khalid168
9 mins ago
Thanks a lot for help ! It's solved like this
– Khalid168
9 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.
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2
It's better if you can copy-paste your code, rather than attaching a screenshot
– Achala Dissanayake
1 hour ago