SetSymbolFromJson
This method extracts a string containing a valid JSON message and attempts to save the contents of the JSON object to an equivalent data structure. The method receives as its input parameters the string with the JSON object, the data type name of the target structure, and the address and size of the target structure instance.
Syntax
METHOD SetSymbolFromJson : BOOL
VAR_IN_OUT CONSTANT
sJson : STRING;
sDatatype : STRING;
END_VAR
VAR_INPUT
nData : UDINT;
pData : PVOID;
END_VAR
VAR_OUTPUT
hrErrorCode : HRESULT;
END_VAR
Return value
Name | Type |
|---|---|
SetSymbolFromJson | BOOL |
Inputs
Name | Type |
|---|---|
nData | UDINT |
pData | PVOID |
/ Inputs/Outputs
Name | Type |
|---|---|
sJson | STRING |
sDatatype | STRING |
Outputs
Name | Type |
|---|---|
hrErrorCode | HRESULT |
Sample call:
fbJsonDataType.SetSymbolFromJson(sJson,'ST_Values',SIZEOF(stValuesReceive), ADR(stValuesReceive));