?? theneedforemptybstrandvariants.cpp
字號:
#import <msado15.dll> rename("EOF", "adoEOF")
struct InitOle {
InitOle() { ::CoInitialize(NULL); }
~InitOle() { ::CoUninitialize(); }
} _init_InitOle_;
void main( void )
{
_variant_t vtEmpty (DISP_E_PARAMNOTFOUND, VT_ERROR);
_variant_t vtEmpty2(DISP_E_PARAMNOTFOUND, VT_ERROR);
_bstr_t bstrEmpty(L"");
_bstr_t Source(L"SELECT * FROM Authors");
ADODB::_ConnectionPtr Conn1 = NULL;
ADODB::_RecordsetPtr Rs1 = NULL;
HRESULT hr = Conn1.CreateInstance( __uuidof( ADODB::Connection ) );
Conn1->ConnectionString = "DSN=AdoDemo;UID=admin;PWD=;";
Conn1->Open( bstrEmpty, bstrEmpty, bstrEmpty, -1 );
Rs1 = Conn1->Execute(
Source,
&vtEmpty,
ADODB::adCmdText );
Rs1->Close();
Conn1->Close();
::MessageBox( NULL, "Success!", "", MB_OK );
}
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