Calculates the size of the buffer needed by the destination data type to support a conversion.
HRESULT GetConversionSize (
DBTYPE wSrcType,
DBTYPE wDstType,
ULONG * pcbSrcLength,
ULONG * pcbDstLength,
void * pSrc);
Parameters
wSrcType
[in]
The source type of the data.
wDstType
[in]
The destination type of the data.
pcbSrcLength
[in]
A pointer to the length of the source data, in bytes. This value can be a null pointer.
pcbDstLength
[out]
A pointer to memory in which to return the size of the destination buffer required for the conversion, in bytes.
pSrc
[in]
A pointer to the source data.
Return Code
S_OK
The method succeeded.
E_FAIL
A provider-specific error occurred.
E_INVALIDARG
pcbDstLength was a null pointer or the information supplied by the consumer was insufficient to determine the appropriate buffer size.
pcbSrcLength was a null pointer and the conversion size was requested for a conversion from a variable-length data type to DBTYPE_STR, DBTYPE_WSTR, DBTYPE_BSTR, or DBTYPE_VARIANT.
DB_E_UNSUPPORTEDCONVERSION
The requested conversion was not supported.