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GoFiler Legato Script Reference
Legato v 1.4j Application v 5.22b
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Chapter Fifteen — Windows/OS Functions (continued)
Object Linking and Embedding (OLE) is a technology developed by Microsoft that allows embedding and linking to documents and other objects. It also allows for automation and applications to act as servers for certain operations.
Legato supports basic interface as well as some Internet Explorer specific functions.
15.8.2 OLE Values and Data Types
OLE has a specific set of data types that are defined over and above conventional data types. Required types are dependent on the serving application.
Types are used both as parameter and return values. For parameters, Legato will automatically convert certain variable data types to OLE VT_ types. Return values are also converted. Others are not directly accessible.
| Windows SDK | Variant Index |
Parameter Legato Type |
Return Legato Type |
Description | ||||
|---|---|---|---|---|---|---|---|---|
| VT_ARRAY | 8192 | — | — | An array of values. | ||||
| VT_BLOB | 65 | — | — | Length prefixed bytes | ||||
| VT_BLOB_OBJECT | 70 | — | — | Blob contains an object | ||||
| VT_BOOL | 11 | boolean | boolean | Boolean value 0 for false or -1 for true. Incoming values are converted non-zero to -1. | ||||
| VT_BSTR | 8 | string | wstring | Pointer to a null-terminated Unicode string. | ||||
| VT_BSTR_BLOB | 4095 | — | — | Reserved for system use | ||||
| VT_BYREF | 16384 | — | — | By reference pointer. | ||||
| VT_CARRAY | 28 | — | — | C style array of values. | ||||
| VT_CF | 71 | — | — | Pointer to a Windows CLIPDATA structure, described above. | ||||
| VT_CLSID | 72 | — | — | Pointer to a class identifier (CLSID) (or other Globally Unique Identifier (GUID)). | ||||
| VT_CY | 6 | — | — | 64-bit two’s complement integer (scaled by 10,000). This type is commonly used for currency amounts. | ||||
| VT_DATE | 7 | — | — | A 64-bit floating point number representing the number of days (not seconds) since December 31, 1899. For example, January 1, 1900, is 2.0, January 2, 1900, is 3.0, and so on). This is stored in the same representation as VT_R8. | ||||
| VT_DECIMAL | 14 | — | — | A Windows fixed DECIMAL structure. | ||||
| VT_DISPATCH | 9 | handle | handle | A Windows object (IDispatch type). As a parameter, this must be a valid OLE type object handle. For a return value, the handle created is a general OLE object that can be used in subsequent calls to OLE functions. | ||||
| VT_EMPTY | See Remarks | — | A property with a type indicator of VT_EMPTY has no data associated with it; that is, the size of the value is zero. | |||||
| VT_ERROR | 10 | — | dword | A 32-bit unsigned that contains a status code. | ||||
| VT_FILETIME | 64 | — | qword | 64-bit Windows FILETIME structure as defined by Win32. This translates to a 64-bit file time. | ||||
| VT_HRESULT | 25 | — | dword | Standard 32-bit Windows return type. | ||||
| VT_I1 | 16 | char | char | 8-bit signed integer. | ||||
| VT_I2 | 2 | wchar short | wchar short | 16-bit signed integer. | ||||
| VT_I4 | 3 | int | int | 32-bit signed integer. | ||||
| VT_I8 | 20 | long | long | 64-bit signed integer. | ||||
| VT_INT | 22 | — | int | 32-bit signed integer value (equivalent to VT_I4). | ||||
| VT_INT_PTR | 37 | — | — | Either a 4-byte or an 8-byte signed integer. The size of the integer is platform specific. | ||||
| VT_LPSTR | 30 | string | string | A pointer to a null-terminated ANSI string in the system default code page. | ||||
| VT_LPWSTR | 31 | wstring | wstring | A pointer to a null-terminated Unicode string in the user default locale. | ||||
| VT_NULL | 1 | — | — | This is like a pointer to NULL. | ||||
| VT_PTR | 26 | — | — | Pointer type. | ||||
| VT_R4 | 4 | — | float | 32-bit floating point. Return value is converted to 64-bit float. | ||||
| VT_R8 | 5 | float | float | 64-bit floating point. | ||||
| VT_RECORD | 36 | — | — | User-defined type. | ||||
| VT_SAFEARRAY | 27 | — | — | An array. | ||||
| VT_STORAGE | 67 | — | — | A pointer to an IStorage interface. | ||||
| VT_STORED_OBJECT | 69 | — | — | A pointer to an IStorage interface. | ||||
| VT_STREAM | 66 | — | — | A pointer to an IStream interface. | ||||
| VT_STREAMED_OBJECT | 68 | — | — | A pointer to an IStream interface. | ||||
| VT_UI1 | 17 | byte | byte | 8-bit unsigned integer. | ||||
| VT_UI2 | 18 | word | word | 16-bit unsigned integer. | ||||
| VT_UI4 | 19 | dword | dword | 32-bit unsigned integer. | ||||
| VT_UI8 | 21 | qword | qword | 64-bit unsigned integer. | ||||
| VT_UINT | 23 | — | dword | 4-byte unsigned integer (equivalent to VT_UI4). | ||||
| VT_UINT_PTR | 38 | — | — | Either a 4-byte or an 8-byte unsigned integer. The size of the integer is platform specific. | ||||
| VT_UNKNOWN | 13 | — | — | SDK IUnknown. | ||||
| VT_USERDEFINED | 29 | — | — | Implementation/user-defined type. | ||||
| VT_VARIANT | 12 | — | — | A DWORD type indicator followed by the corresponding value. | ||||
| VT_VECTOR | 4096 | — | — | Simple counted array of values. | ||||
| VT_VERSIONED_STREAM | 73 | — | — | Stream with a GUID version. | ||||
| VT_VOID | 24 | — | — | C style void. |
Many OLE functions also require null parameters. Since this cannot be easily represented in Legato, a string constant, OLE_PARAM_EMPTY, has been defined with the content “{oleempty}”. This value can be used in place of a parameter or stored in a string data type.
Any OLE calls making contact with a server that exchange variant types will have the variant index stored in the last error buffer. Use the GetLastError function to retrieve the index value. Since return type mismatches can result in runtime errors, making a call to OLERunMethod or OLEGetProperty without capturing the return can allow the return type to be determined.
Return variants not understood by the processor are returned as boolean TRUE with the error message containing the variant type index.
General Functions:
OLEGetObject — Returns a handle to a specific OLE connection.
OLEGetProperty — Gets a specified property for an OLE object with a series of parameters.
OLEPutProperty — Set a specified property for an OLE object with a series of parameters.
OLERunMethod — Runs a specific OLE command with a series of parameters.
Internet Explorer:
OLEIEClose — Closes specified Internet Explorer application.
OLEIEGet — Loads a page using the ‘get’ verb within Internet Explorer.
OLEIEIsBusy — Checks to see if Internet Explorer is busy.
OLEIEPost — Loads a page using the ‘post’ verb within Internet Explorer.
OLEIEPostFile — Posts data within Internet Explorer using a specific field name.
OLEIERead — Reads the current page from an Internet Explorer instance.
OLEIEShow — Shows specified Internet Explorer application.
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