[php-src] Issue #8750: php_com_dotnet - can not create VT_ERROR variant type

Issue: https://github.com/php/php-src/issues/8750 Author: systoolz ### Description Can not create VT_ERROR variant type. It's required for some COM method calls where you need to specify an empty argument, since it's VT_ERROR type variant with error DISP_E_PARAMNOTFOUND (0x80020004) as actual error code ([see here](https://devblogs.microsoft.com/oldnewthing/20140129-00/?p=1933)). The following code: ```php <?php // database.php // next line works only in PHP 4.4.9 (PHP 5, 6, 7 and 8 are bugged) $vtMissing = new VARIANT(0x80020004, VT_ERROR); $db = new COM('ADODB.Connection'); $db->ConnectionString = 'Provider=Microsoft.Jet.OLEDB.4.0;Data Source=database.mdb'; $db->Mode = 1; // adModeRead $db->Open(); // adSchemaProviderSpecific, *missing*, JET_SCHEMA_USERROSTER $rs = $db->OpenSchema(-1, $vtMissing, '{947bb102-5d43-11d1-bdbf-00c04fb92675}'); // manual counting since rs.RecordCount is -1 (not supported) $i = 0; while (!$rs->EOF) { $rs->MoveNext(); $i++; } $rs->Close(); $rs = null; $db->Close(); $db = null; echo $i; ``` Resulted in this output: ``` Fatal error: Uncaught com_exception: Variant type conversion failed: Type mismatch in Z:\database.php:3 Stack trace: #0 Z:\database.php(3): variant->__construct(2147614724, 10) #1 {main} thrown in Z:\database.php on line 3 ``` But I expected this output instead: ``` 1 ``` Test file "database.mdb" can be any Microsoft Access database file, even without any tables inside. More details can be found in this article (auto-translated from Russian): [VT_MISSING argument in PHP for COM objects](https://systools-losthost-org.translate.goog/?articles=8&_x_tr_sl=ru&_x_tr_tl=en&_x_tr_hl=en-US&_x_tr_pto=wapp) ### PHP Version PHP 8.1.7 x64 ### Operating System Windows 7 x64