SaveVar

Env::SaveVar

uint32_t SaveVar(const void* pKey , uint32_t nKey , const void* pVal , uint32_t nVal , uint8_t nType);

Save the new value of the variable denoted by {nType, [pKey, nKey]}

Parameters

• pKey : pointer to the key. Key could be any kind of data
• nKey : the size of the key
• pVal : pointer to the value buffer
• nVal : the size of the value buffer
• nType : the type of the variable (see KeyTag for possible values)

Return value

• the previous size of the value of the variable
• 0 if there was no such a variable

Notes

• if nVal is zero then the variable is deleted
• Will Halt() if either variable key or value is invalid (too long).
• Set nType to KeyTag::Internal for normal variables, or KeyTag::InternalStealth for 'stealth' (those are not stored in MMR), other variable types are read-only.

Example