Crash when calling SQLSetDescField

Hi,
	
	Following steps lead to crash!
	1. call SQLAllocHandle to allocate a statement handle
	2. call SQLGetStmtAttr(...,SQL_ATTR_IMP_PARAM_DESC,...) to get the IPD of the stmt handle
	3. call SQLSetDescField(...,1,SQL_DESC_PARAMETER_TYPE,...)
	The 3rd step leads to crash.
	But SQLSetDescField(...,1,SQL_DESC_CONCISE_TYPE,...) will not crash, and following call to set SQL_DESC_PARAMETER_TYPE will not crash either.
	

　　Regards,　　　　　
 				

　　　　　　　　Han
　　　　　　　　zhouhanok@vip.sina.com
　　　　　　　　　　2002-12-25