return type of chaincode functions using EvaluateTransaction
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Nikos Karamolegkos
As I can see this
functions returns car which is type *Car after unmarshal.
Given that the EvaluateTransaction returns bytes can I
bypass unmarshal and return carAsBytes
from QueryCar (i.e return type []byte) to the client and
let the client do whatever needs? (unmarshal or no). I am asking because I have tried that and it
hadn't worked. -- Nikos Karamolegkos R & D engineer at ICS-FORTH Telecommunications and Networks Lab (TNL)
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Matthew White
Hello – you can return bytes if you wish;
What errors did you encounter?
Thanks Matthew
From: fabric@... <fabric@...>
On Behalf Of Nikos Karamolegkos
As I can see this functions returns car which is type *Car after unmarshal. Given that the EvaluateTransaction returns bytes can I bypass unmarshal and return carAsBytes from QueryCar (i. e return type ZjQcmQRYFpfptBannerStart
ZjQcmQRYFpfptBannerEnd As I can see this functions returns car which is type *Car after unmarshal. Given that the EvaluateTransaction returns bytes can I bypass unmarshal and return carAsBytes from QueryCar (i.e return type []byte) to the client and let the client do whatever needs? (unmarshal or no). I am asking because I have tried that and it hadn't worked. -- Nikos Karamolegkos R & D engineer at ICS-FORTH Telecommunications and Networks Lab (TNL)
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Nikos Karamolegkos
the
evaluateResult, err := contract.EvaluateTransaction("GetAirQNomVals")
func (s *smartContract) GetAirQNomVals(ctx contractapi.TransactionContextInterface) ([]byte, error) {
resultsIterator, err := ctx.GetStub().GetState("NominalValuesState")
if err != nil {
return nil, fmt.Errorf("failed to read from world state. %s", err.Error())
}
if resultsIterator == nil {
return nil, fmt.Errorf("%s does not exist", "NominalValuesState")
}
return resultsIterator, nil
}
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Nikos Karamolegkos
based on this I have to
func (s *smartContract) GetAirQNomVals(ctx contractapi.TransactionContextInterface) (string, error) {
resultsIterator, err := ctx.GetStub().GetState("NominalValuesState")
if err != nil {
return "", fmt.Errorf("failed to read from world state. %s", err.Error())
}
if resultsIterator == nil {
return "", fmt.Errorf("%s does not exist", "NominalValuesState")
}
return string(resultsIterator), nil
}
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