Decrement Int Value - Devolens (formerly Cryptolens) Documentation

This method will decrement the integer value in a Data Object by a certain constant (non-negative). You can always increment it. Note, this method does not allow integer overflows, i.e. if you decrement by a constant that would result in an overflow, an error will be thrown. Note also that you can use the Feature lock in the Access Token to specify the upper bound of the decrement constant. So, if you only want to allow decrementing by 1, please set Feature lock field to 1 also. Please see Remarks for more details (including access token setup). This method is accessed in several ways. Each way works in the same way and requires the same permission. The only difference is the type of parameters. Both cases are listed below:

Parameters

Method 1 (general): https://api.cryptolens.io/api/data/DecrementIntValue

Parameter	Description	Remarks
Id	The unique object id for the data object.	required
IntValue	The constant int value that should be subtracted to the current IntValue of the data object. For example, if this value is set to 5 and the old IntValue is 11, then the new IntValue will be the old one minus 5, i.e. 6. Note, if you would set this value to -5 instead, the same result would be achieved.	optional, 0 by default.
EnableBound	If set to true, it will be possible to specify a lower bound. For example, if you set the Bound parameter (below) to 0, you will be able to decrement the int value until you reach zero (inclusive). Once the lower bound is reached, an error will be thrown.	optional, false by default.
Bound	This is the lower bound that will be enforced on the decrement operation. It will only be enforced if EnableBound is set to true. Please read the description above.	optional, 0 by default.
v	Method version.	optional. by default, it’s 1.

Method 2 (key specific): https://api.cryptolens.io/api/data/DecrementIntValueToKey There are two ways to call this method:

Parameter	Description	Remarks
ProductId	the product id (=[ProductId] )	required
Key	the serial key string	required
Id	The unique object id for the data object.	required
IntValue	The constant int value that should be subtracted to the current IntValue of the data object. For example, if this value is set to 5 and the old IntValue is 11, then the new IntValue will be the old one minus 5, i.e. 6. Note, if you would set this value to -5 instead, the same result would be achieved.	optional, 0 by default.
EnableBound	If set to true, it will be possible to specify a lower bound. For example, if you set the Bound parameter (below) to 0, you will be able to decrement the int value until you reach zero (inclusive). Once the lower bound is reached, an error will be thrown.	optional, false by default.
Bound	This is the lower bound that will be enforced on the decrement operation. It will only be enforced if EnableBound is set to true. Please read the description above.	optional, 0 by default.
v	Method version.	optional. by default, it’s 1.

Parameter	Description	Remarks
ProductId	the product id (=[ProductId] )	required
Key	the serial key string	required
Name	The name of the data object.	required
IntValue	The constant int value that should be subtracted to the current IntValue of the data object. For example, if this value is set to 5 and the old IntValue is 11, then the new IntValue will be the old one minus 5, i.e. 6. Note, if you would set this value to -5 instead, the same result would be achieved.	optional, 0 by default.
EnableBound	If set to true, it will be possible to specify a lower bound. For example, if you set the Bound parameter (below) to 0, you will be able to decrement the int value until you reach zero (inclusive). Once the lower bound is reached, an error will be thrown.	optional, false by default.
Bound	This is the lower bound that will be enforced on the decrement operation. It will only be enforced if EnableBound is set to true. Please read the description above.	optional, 0 by default.
v	Method version.	optional. by default, it’s 1.

Method 3 (machine code specific): https://api.cryptolens.io/api/data/DecrementIntValueToMachineCode There are two ways to call this method:

Parameter	Description	Remarks
ProductId	the product id (=[ProductId] )	required
Key	the serial key string	required
MachineCode	the machine code	required
Id	The unique object id for the data object.	required
IntValue	The constant int value that should be subtracted to the current IntValue of the data object. For example, if this value is set to 5 and the old IntValue is 11, then the new IntValue will be the old one minus 5, i.e. 6. Note, if you would set this value to -5 instead, the same result would be achieved.	optional, 0 by default.
EnableBound	If set to true, it will be possible to specify a lower bound. For example, if you set the Bound parameter (below) to 0, you will be able to decrement the int value until you reach zero (inclusive). Once the lower bound is reached, an error will be thrown.	optional, false by default.
Bound	This is the lower bound that will be enforced on the decrement operation. It will only be enforced if EnableBound is set to true. Please read the description above.	optional, 0 by default.
v	Method version.	optional. by default, it’s 1.

Parameter	Description	Remarks
ProductId	the product id (=[ProductId] )	required
Key	the serial key string	required
MachineCode	the machine code	required
Name	The name of the data object.	required
IntValue	The constant int value that should be subtracted to the current IntValue of the data object. For example, if this value is set to 5 and the old IntValue is 11, then the new IntValue will be the old one minus 5, i.e. 6. Note, if you would set this value to -5 instead, the same result would be achieved.	optional, 0 by default.
EnableBound	If set to true, it will be possible to specify a lower bound. For example, if you set the Bound parameter (below) to 0, you will be able to decrement the int value until you reach zero (inclusive). Once the lower bound is reached, an error will be thrown.	optional, false by default.
Bound	This is the lower bound that will be enforced on the decrement operation. It will only be enforced if EnableBound is set to true. Please read the description above.	optional, 0 by default.
v	Method version.	optional. by default, it’s 1.

Results

Parameter	Description	Remarks
Result	This is either 0(=success) or 1(=error).	always returned
Message	The message that provides additional information about the result. If it’s a successful result, null will be returned. Otherwise, in case of an error, a short message will be returned describing the error.	always returned.

Example results

{"result":0,"message":null}

Remarks

The sign of the IntValue (decrementing constant) parameter will not be taken into account, i.e. -5 is treated as 5.
Integer overflows are not allowed. If you attempt to decrement by constant that would result in an integer overflow, an error will be thrown and no changes are going to be made.
Feature lock in Access Token can be used as a way to specify the upper bound for the IntValue (decrementing constant). If Feature lock is not 0, the value of the Feature lock will function as an upper bound. So, if you only want to allow decrementing by 1, please set Feature lock to 1
The EnableBound option allows you to specify a lower bound for the decrement operation. That is, if you want to force this method to stop at zero (eg. allow only positive values), you can specify the Bound to be 0. In this case, when the int value reaches zero, it will no longer be possible to decrement the int value. This condition is temporal, i.e. by modifying the lower bound parameter, you can achieve a different lower bound.
When accessing the key specific methods (using productId and the key string), you need to either disable key lock (set it to zero) or set it to a negative number, in the same way you would have done if you would have used KeyLock. We recommend to set the KeyLock to -1 when creating the access token.

Errors

Error
Access denied.
The input parameters were incorrect.
Not enough permission.
Not enough permission and/or product not found.
Not enough permission and/or key not found.
Incorrect ‘ReferencerType’. It can either be 0 (for a User), 1 (for a Product) and 2 (for a Key).
The increment/decrement value not allowed by security settings.
Cannot increment/decrement value since the limit was reached for an int32.
Not enough permission and/or machine code not found.

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​Example results

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Example results

Remarks

Errors