oledb32: Fix variant to integer conversion.

dlls/oledb32/convert.c

@@ -213,6 +213,7 @@ static HRESULT WINAPI convert_DataConvert(IDataConvert* iface,
     case DBTYPE_I2:
     {
         signed short *d = dst;
+        VARIANT tmp;
         switch(src_type)
         {
         case DBTYPE_EMPTY:       *d = 0; hr = S_OK;                              break;
@@ -231,7 +232,11 @@ static HRESULT WINAPI convert_DataConvert(IDataConvert* iface,
         case DBTYPE_UI4:         hr = VarI2FromUI4(*(DWORD*)src, d);             break;
         case DBTYPE_I8:          hr = VarI2FromI8(*(LONGLONG*)src, d);           break;
         case DBTYPE_UI8:         hr = VarI2FromUI8(*(ULONGLONG*)src, d);         break;
-        case DBTYPE_VARIANT:     *d = V_I2((VARIANT*)src); hr = S_OK;            break;
+        case DBTYPE_VARIANT:
+            VariantInit(&tmp);
+            if ((hr = VariantChangeType(&tmp, (VARIANT*)src, 0, VT_I2)) == S_OK)
+                *d = V_I2(&tmp);
+            break;
         default: FIXME("Unimplemented conversion %04x -> I2\n", src_type); return E_NOTIMPL;
         }
         break;
@@ -240,6 +245,7 @@ static HRESULT WINAPI convert_DataConvert(IDataConvert* iface,
     case DBTYPE_I4:
     {
         signed int *d = dst;
+        VARIANT tmp;
         switch(src_type)
         {
         case DBTYPE_EMPTY:       *d = 0; hr = S_OK;                              break;
@@ -258,7 +264,11 @@ static HRESULT WINAPI convert_DataConvert(IDataConvert* iface,
         case DBTYPE_UI4:         hr = VarI4FromUI4(*(DWORD*)src, d);             break;
         case DBTYPE_I8:          hr = VarI4FromI8(*(LONGLONG*)src, d);           break;
         case DBTYPE_UI8:         hr = VarI4FromUI8(*(ULONGLONG*)src, d);         break;
-        case DBTYPE_VARIANT:     *d = V_I4((VARIANT*)src); hr = S_OK;            break;
+        case DBTYPE_VARIANT:
+            VariantInit(&tmp);
+            if ((hr = VariantChangeType(&tmp, (VARIANT*)src, 0, VT_I4)) == S_OK)
+                *d = V_I4(&tmp);
+            break;
         default: FIXME("Unimplemented conversion %04x -> I4\n", src_type); return E_NOTIMPL;
         }
         break;