>>>>>>>>

2001-07-19 08:53:47 204 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

从RTL到GDSII：DC综合里那些没人告诉你的时钟约束冷知识（附真实工程示例）本文深入探讨数字IC设计中DC综合阶段的时钟约束冷知识，包括无毛刺时钟切换、寄存器分频时钟约束、虚拟时钟应用等关键技巧。通过真实工程示例，揭示常见约束误区及解决方案，帮助工程师提升时序收敛效率。特别针对input_delay和output_delay在多时钟域场景下的设置陷阱提供实用指南。阅读详情

能找到的例子都是vb的，在vb中可以不加参数，但是VC中就不行，谁有这方面的经验请
赐教！！！
每次编译可以通过，但是运行到open这一句就出错
代码如下
_bstr_t SQLxml;

try
{
m_connection.CreateInstance("ADODB.Connection");
m_command.CreateInstance("ADODB.Command");
m_strmIn.CreateInstance("ADODB.Stream");
m_strmOut.CreateInstance("ADODB.Stream");
m_recordset.CreateInstance("ADODB.Recordset");
m_record.CreateInstance("ADODB.Record");

//Open a conneciton to the SQL Server
//m_connection->Provider="SQLOLEDB";
_bstr_t sql;
sql="driver=sql server;server=yangys;database=test;uid=sa";
m_connection->Open(sql,"","",adModeUnknown);

m_command->ActiveConnection=m_connection;

//build the command string for a XML
SQLxml="<root xmlns:sql=""urn:schemas-microsoft-com:xml-sql""><sql:query><![CDATA[select * form employee for xml auto]]></sql:query></root>";

//Open the command stream and write our template to it
_bstr_t bstrUser="sa";
_bstr_t bstrPwd="";

m_strmIn->GetState(); // for test state

m_strmIn->Open //<<<<<< RUNTIME ERROR>>>>>>>("",adModeUnknown,adOpenStreamFromRecord,bstrUser,bstrPwd);
m_strmIn->WriteText(SQLxml,adWriteChar);
m_strmIn->Position=0;

//Execute the command,open the return stream,and read the result
m_strmOut->Open("",adModeUnknown,adOpenStreamAsync,"","");
m_strmOut->LineSeparator=adCRLF;

_variant_t rsAffect;

Properties* pProperties;
Property* pProperty;
_variant_t vtIndex;
vtIndex.vt=VT_I2;
m_command->get_Properties((Properties**)&pProperties);
pProperties->get_Item(vtIndex,(Property**)&pProperty);
pProperty->GetValue();

m_command->Execute(&rsAffect,NULL,adExecuteStream);

m_strmOut->Position=0;

运行到m_strmIn->Open这句时就会出错，是内存读取错误
请帮忙看看，谢谢！

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