com创建失败

[sunht]

用vb写了一个com+组件，注册后用vc 调用，编译一切正常，可是在CreateInstance(__uuidof(test::class1))的时候总是不能成功，用SUCCEEDED宏判断总是发现创建失败，怎么回事呢？？？

[wyzegg]

test::class1怎么是这样呢，一般要test.class1
看一个ado怎么写的
_ConnectionPtr pConnection;
pConnection.CreateInstance(__uuidof(Connection));
所以连test.都不用要就行的
看一下ado怎么用的
#include "stdafx.h"
#include "afxdb.h"
#include "stdio.h"
#include "windows.h"
#define _WIN32_DCOM
#import "msado15.dll" no_namespace rename("EOF", "EndOfFile")
int main(int argc, char* argv[])
{
int nRow=0;
char name[30];
CoInitialize(NULL);
_ConnectionPtr pConnection;
FieldsPtr pFieldsPtr;
FieldPtr pFieldPtr;
_RecordsetPtr pUserSet;
char *szOpen="Provider=MSDAORA.1;Password=DaoBaDan;User ID=wyz;Persist Security Info=False";
// char * szOpen="Provider=MSDASQL.1;Persist Security Info=False;Data Source=AddressBook";
try
{
pConnection.CreateInstance(__uuidof(Connection));
pConnection->Open(szOpen,"","",-1);
}
catch(...)
{
printf("数据库初始化错误,程序将关闭!\n");
return FALSE;
}
variant_t var;
try
{
pConnection->Execute("insert into test_tab values(1004,'43646')"/*"select * from test_tab"*/,&var,adCmdText);
pConnection->Execute("commit"/*"select * from test_tab"*/,&var,adCmdText);
}
catch(_com_error *e)
{
printf(e->ErrorMessage());
}
pUserSet.CreateInstance(__uuidof(Recordset));
try
{

pUserSet->Open("test_tab",
pConnection.GetInterfacePtr(),
adOpenDynamic,
adLockOptimistic,
adCmdTable);


while (!pUserSet->EndOfFile)
{

nRow++;
pFieldsPtr = pUserSet->Fields;
pFieldPtr = pFieldsPtr->Item["test_id"];
if( pFieldPtr->Value.vt==VT_NULL )
strcpy(name,"");
else
strcpy(name,_bstr_t(pFieldPtr->Value));
printf("row%d's test_id is %s\n",nRow,name);

pUserSet->MoveNext();


}
}
catch(...)
{
printf("error");
}
try
{
pUserSet->AddNew();

}
catch(_com_error * e)
{
printf(e->ErrorMessage());
}

/* pFieldsPtr = pUserSet->Fields;
pUserSet->AddNew();
{
pFieldPtr = pFieldsPtr->Item["test_id"];
char *str = "88888";

pFieldPtr->Value = (_variant_t)str;

pFieldPtr = pFieldsPtr->Item["test_name"];
str = "88888";

/* pFieldPtr->Value = (_variant_t)str;

pFieldPtr = pFieldsPtr->Item["Address"];
str = "88888";

pFieldPtr->Value = (_variant_t)str;

pFieldPtr = pFieldsPtr->Item["emailAddress"];
str = "88888";

pFieldPtr->Value = (_variant_t)str;

pFieldPtr = pFieldsPtr->Item["mobilephone"];
str = "88888";

pFieldPtr->Value = (_variant_t)str;

pFieldPtr = pFieldsPtr->Item["homephone"];
str = "88888";

pFieldPtr->Value = (_variant_t)str;

pFieldPtr = pFieldsPtr->Item["Notes"];
str = "88888";

pFieldPtr->Value = (_variant_t)str;*/
/* }
pUserSet->Update();
pUserSet->MoveFirst();
pUserSet->Delete(adAffectCurrent);
pUserSet->Update();
pUserSet->Close();
/* catch(...)
{
//printf(e->ErrorMessage());
printf("fdgdg");
}*/

// pUserSet->Close();


/* catch(_com_error *e)
{
printf(e->ErrorMessage());
}*/
/* catch(...)
{
printf("error");
}*/
CoUninitialize();
return 0;

}

[zzh]

你在VC中要首先初始化COM库

[sunht]

to wyzegg(蛋)　可是project1::class1这种写法是没有问题的，你的程序中的
_ConnectionPtr pConnection;如果没有no_namespace的话，应该写成ADODB::_ConnectionPtr pConnection;并不是这个问题，我看到别人这么用成功了的，真的。
to zzh()初始化COM库是肯定的呀， 我做了