IPB_Session interface:
AcquireValue method
Description
Clones the data in the PBCallInfo structure and resets the
IPB_Value pointer.
Syntax
|
1 |
AcquireValue ( IPBValue* <span>value</span> ) |
|
Argument |
Description |
|---|---|
|
value |
The value to be returned |
Return Values
IPB_Value*.
Examples
The AcquireValue method is used
to obtain a message argument value. Later, when the value is no
longer needed, it is released using ReleaseValue to
avoid memory leaks:
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1 |
// Acquire a value<br>MessageArg = session-><span>AcquireValue</span><br>   ( ci->pArgs->GetAt(0) );<br>pbstring pbMessage = MessageArg->GetString() ;<br>Message = (LPSTR)session->GetString(pbMessage) ;<br>...<br>// Cleanup phase<br>if (MessageArg)<br>{<br>   Session->ReleaseValue ( MessageArg ) ;<br>} |
Usage
The AcquireValue method enables you to
retain the data in the PBCallInfo structure. The AcquireValue method
is independent of the type of the data but is most useful for acquiring
the value of pointer values such as pbvalue_string, pbvalue_blob,
and so on. When you call FreeInfo, the data is
not freed and the pointer returned by AcquireValue is
still valid.If the value acquired is an array, the entire array
is acquired. To acquire a single element in an array, use the AcquireItemValue method.When
you no longer need the data, you must call
the ReleaseValue method to free the data. Failing
to do so causes a memory leak.The PBVM clones a new IPB_Value
and resets the existing one. If you attempt to get or acquire the
original value, the value returned is zero or null until another
IPB_Value is set to the value.