高分送高手！怎样以最快速度用VC++获取ACCESS2000中表的字段名和字段长度？！

Question

_Connection dbcon;
_Recordset rs;
dbcon.CreateDispatch("ADODB.Connection");
dbcon.Open(m_strConnection,"","",NULL);
rs.CreateDispatch("ADODB.Recordset");
COleVariant vt(m_strTable);
rs.Open(vt,COleVariant(m_strConnection), adOpenStatic,adLockOptimistic, adCmdTable);
LPDISPATCH lpDisp;
lpDisp=rs.GetFields();
ASSERT(lpDisp);
Fields fields;
fields.AttachDispatch(lpDisp);
VARIANT varIndex;
VariantInit(&varIndex);
varIndex.vt=VT_I2;
int nFields=fields.GetCount();
Field field;
CString strFieldName,strFieldType;
long lDefineSize;
for(int i=0;i<nFields;i++)
{
varIndex.iVal=i;
lpDisp=fields.GetItem(varIndex);
field.AttachDispatch(lpDisp);
strFieldName=field.GetName();
lDefineSize=field.GetDefinedSize();
}
field.ReleaseDispatch();
fields.ReleaseDispatch();
rs.Close();
rs.ReleaseDispatch();
dbcon.Close();
dbcon.ReleaseDispatch();

Answer 1

#include <conio.h>
#define PAUSE  printf("\npress any key to exit"); getch();#define _WIN32_DCOM#pragma warning(push)
#pragma warning(disable:4146)
#import "e:\program files\common files\system\ado\MSADO15.DLL" no_namespace rename("EOF", "EndOfFile")
#pragma warning(pop)int main(int argc, char* argv[])
{
_ConnectionPtr m_pConn;
_RecordsetPtr m_pRs;
CoInitializeEx(NULL, COINIT_MULTITHREADED);
_bstr_t bstrConnStr = "Provider=Microsoft.Jet.OLEDB.4.0;"
"Data Source=F:\\lylong\\db1.mdb;Persist Security Info=False";
try{
m_pConn.CreateInstance( __uuidof(Connection) );
m_pRs.CreateInstance( __uuidof(Recordset) );
m_pConn->Open( bstrConnStr, "", "", adConnectUnspecified );
m_pRs->Open( "table1", 
m_pConn.GetInterfacePtr(), adOpenForwardOnly, adLockOptimistic, adCmdTable); long lColumn = m_pRs->Fields->Count;
printf("%-12s%-10s%-10s\n", "×&Ouml;&para;&Icirc;&Atilde;&ucirc;", "&sup3;¤&para;&Egrave;", "&Agrave;à&ETH;&Iacute;");
for( long i=0; i<lColumn; i++ )
{
printf("%-12s%-10d%-10d\n", (char*)m_pRs->Fields->Item[i]->Name, 
m_pRs->Fields->Item[i]->DefinedSize,
m_pRs->Fields->Item[i]->Type);
}

m_pRs->Close();
m_pConn->Close();
}catch( _com_error e )
{
printf( "\n%s Error: %ld\r\n"
"%s\r\n"
"%s\r\n",
(char*)e.Source(),
e.Error(),
(char*)e.Description(),
(char*)e.ErrorMessage() );
m_pRs->Close();
m_pConn->Close();
}
CoUninitialize();
PAUSE;
return 0;
}

Answer 2

乱码为：
printf("%-12s%-10s%-10s\n", "字段名", "长度", "类型");：）

Answer 3

try
{
if(m_pDB.IsOpen())
m_pDB.Close();
m_pDB.Open(GetDefaultDBName(),FALSE,FALSE,MYPASSWORD);
}
catch(CDaoException* e)
{
DisplayDaoException(e);
e->Delete();
return;
}
CDaoTableDef m_OpenTable(&m_pDB);
try
{
m_OpenTable.Open(this->m_strUniqueName);//确定打开什么表
}
catch(CDaoException* e)
{
DisplayDaoException(e);
e->Delete();
return;
}
int nFields;
CDaoFieldInfo fieldInfo;
try
{
nFields=m_OpenTable.GetFieldCount();
for(int j=0;j<nFields;j++)
{
m_OpenTable.GetFieldInfo(j,fieldInfo);
// rListCtrl.InsertItem( j, fieldInfo.m_strName);//行头
rListCtrl.InsertColumn( j,fieldInfo.m_strName , LVCFMT_LEFT, 200, 0 );
}
}
catch(CDaoException* e)
{
DisplayDaoException(e);
e->Delete();
return;
}
m_OpenTable.Close();

LoadColumnWidths(); //查询

Answer 4

类型定义：
enum DataTypeEnum
{
    adEmpty = 0,
    adTinyInt = 16,
    adSmallInt = 2,
    adInteger = 3,
    adBigInt = 20,
    adUnsignedTinyInt = 17,
    adUnsignedSmallInt = 18,
    adUnsignedInt = 19,
    adUnsignedBigInt = 21,
    adSingle = 4,
    adDouble = 5,
    adCurrency = 6,
    adDecimal = 14,
    adNumeric = 131,
    adBoolean = 11,
    adError = 10,
    adUserDefined = 132,
    adVariant = 12,
    adIDispatch = 9,
    adIUnknown = 13,
    adGUID = 72,
    adDate = 7,
    adDBDate = 133,
    adDBTime = 134,
    adDBTimeStamp = 135,
    adBSTR = 8,
    adChar = 129,
    adVarChar = 200,
    adLongVarChar = 201,
    adWChar = 130,
    adVarWChar = 202,
    adLongVarWChar = 203,
    adBinary = 128,
    adVarBinary = 204,
    adLongVarBinary = 205,
    adChapter = 136,
    adFileTime = 64,
    adPropVariant = 138,
    adVarNumeric = 139,
    adArray = 8192
};