Data Type Conversion Errors
A message indicating that a data type conversion could not take place uses a numeric code to identify the data type. The following tables translate the numeric codes into their equivalent variant data types (for Visual C++) and Automation data types (for Visual Basic).
| Numeric Code | Variant Data Type | Automation Data Type |
|---|---|---|
| 0x0000 | VT_EMPTY | nothing |
| 0x0002 | VT_I2 | 2-byte signed int |
| 0x0003 | VT_I4 | 4-byte signed int |
| 0x0004 | VT_R4 | 4-byte real |
| 0x0005 | VT_R8 | 8-byte real |
| 0x0006 | VT_CY | currency |
| 0x0007 | VT_DATE | date |
| 0x0008 | VT_BSTR | OLE Automation string |
| 0x0009 | VT_DISPATCH | IDispatch * (currently only for recordset pointer) |
| 0x000b | VT_BOOL | True=-1, False=0 |
| 0x000c | VT_VARIANT | VARIANT * |
| 0x000e | VT_DECIMAL | 16-byte fixed point |
| 0x0011 | VT_UI1 | unsigned char |
| 0x0018 | VT_VOID | C style void |
| 0x001b | VT_SAFEARRAY | (use VT_ARRAY in VARIANT) |
| 0x001d | VT_USERDEFINED | user-defined type |
Arrays of the following types have these codes:
| Numeric Code | Variant Data Type | Automation Data Type |
|---|---|---|
| 0x2000 | VT_EMPTY | nothing |
| 0x2002 | VT_I2 | 2-byte signed int |
| 0x2003 | VT_I4 | 4-byte signed int |
| 0x2004 | VT_R4 | 4-byte real |
| 0x2005 | VT_R8 | 8-byte real |
| 0x2006 | VT_CY | currency |
| 0x2007 | VT_DATE | date |
| 0x2008 | VT_BSTR | OLE Automation string |
| 0x2009 | VT_DISPATCH | IDispatch * (currently only for recordset pointer) |
| 0x200b | VT_BOOL | True=-1, False=0 |
| 0x200c | VT_VARIANT | VARIANT * |
| 0x200e | VT_DECIMAL | 16-byte fixed point |
| 0x2011 | VT_UI1 | unsigned char |
| 0x2018 | VT_VOID | C style void |
| 0x201b | VT_SAFEARRAY | (use VT_ARRAY in VARIANT) |
| 0x201d | VT_USERDEFINED | user-defined type |
The following types are passed by reference:
| Numeric Code | Variant Data Type | Automation Data Type |
|---|---|---|
| 0x4000 | VT_EMPTY | nothing |
| 0x4002 | VT_I2 | 2-byte signed int |
| 0x4003 | VT_I4 | 4-byte signed int |
| 0x4004 | VT_R4 | 4-byte real |
| 0x4005 | VT_R8 | 8-byte real |
| 0x4006 | VT_CY | currency |
| 0x4007 | VT_DATE | date |
| 0x4008 | VT_BSTR | OLE Automation string |
| 0x4009 | VT_DISPATCH | IDispatch * (currently only for recordset pointer) |
| 0x400b | VT_BOOL | True=-1, False=0 |
| 0x400c | VT_VARIANT | VARIANT * |
| 0x400e | VT_DECIMAL | 16-byte fixed point |
| 0x4011 | VT_UI1 | unsigned char |
| 0x4018 | VT_VOID | C style void |
| 0x401b | VT_SAFEARRAY | (use VT_ARRAY in VARIANT) |
| 0x401d | VT_USERDEFINED | user-defined type |
Arrays of the following types are passed by reference:
| Numeric Code | Variant Data Type | Automation Data Type |
|---|---|---|
| 0x6000 | VT_EMPTY | nothing |
| 0x6002 | VT_I2 | 2-byte signed int |
| 0x6003 | VT_I4 | 4-byte signed int |
| 0x6004 | VT_R4 | 4-byte real |
| 0x6005 | VT_R8 | 8-byte real |
| 0x6006 | VT_CY | currency |
| 0x6007 | VT_DATE | date |
| 0x6008 | VT_BSTR | OLE Automation string |
| 0x6009 | VT_DISPATCH | IDispatch * (currently only for recordset pointer) |
| 0x600b | VT_BOOL | True=-1, False=0 |
| 0x600c | VT_VARIANT | VARIANT * |
| 0x600e | VT_DECIMAL | 16-byte fixed point |
| 0x6011 | VT_UI1 | unsigned char |
| 0x6018 | VT_VOID | C style void |
| 0x601b | VT_SAFEARRAY | (use VT_ARRAY in VARIANT) |
| 0x601d | VT_USERDEFINED | user-defined type |