Serge Bazanski | cc25bdf | 2018-10-25 14:02:58 +0200 | [diff] [blame^] | 1 | package ole |
| 2 | |
| 3 | import "unsafe" |
| 4 | |
| 5 | type IDispatch struct { |
| 6 | IUnknown |
| 7 | } |
| 8 | |
| 9 | type IDispatchVtbl struct { |
| 10 | IUnknownVtbl |
| 11 | GetTypeInfoCount uintptr |
| 12 | GetTypeInfo uintptr |
| 13 | GetIDsOfNames uintptr |
| 14 | Invoke uintptr |
| 15 | } |
| 16 | |
| 17 | func (v *IDispatch) VTable() *IDispatchVtbl { |
| 18 | return (*IDispatchVtbl)(unsafe.Pointer(v.RawVTable)) |
| 19 | } |
| 20 | |
| 21 | func (v *IDispatch) GetIDsOfName(names []string) (dispid []int32, err error) { |
| 22 | dispid, err = getIDsOfName(v, names) |
| 23 | return |
| 24 | } |
| 25 | |
| 26 | func (v *IDispatch) Invoke(dispid int32, dispatch int16, params ...interface{}) (result *VARIANT, err error) { |
| 27 | result, err = invoke(v, dispid, dispatch, params...) |
| 28 | return |
| 29 | } |
| 30 | |
| 31 | func (v *IDispatch) GetTypeInfoCount() (c uint32, err error) { |
| 32 | c, err = getTypeInfoCount(v) |
| 33 | return |
| 34 | } |
| 35 | |
| 36 | func (v *IDispatch) GetTypeInfo() (tinfo *ITypeInfo, err error) { |
| 37 | tinfo, err = getTypeInfo(v) |
| 38 | return |
| 39 | } |
| 40 | |
| 41 | // GetSingleIDOfName is a helper that returns single display ID for IDispatch name. |
| 42 | // |
| 43 | // This replaces the common pattern of attempting to get a single name from the list of available |
| 44 | // IDs. It gives the first ID, if it is available. |
| 45 | func (v *IDispatch) GetSingleIDOfName(name string) (displayID int32, err error) { |
| 46 | var displayIDs []int32 |
| 47 | displayIDs, err = v.GetIDsOfName([]string{name}) |
| 48 | if err != nil { |
| 49 | return |
| 50 | } |
| 51 | displayID = displayIDs[0] |
| 52 | return |
| 53 | } |
| 54 | |
| 55 | // InvokeWithOptionalArgs accepts arguments as an array, works like Invoke. |
| 56 | // |
| 57 | // Accepts name and will attempt to retrieve Display ID to pass to Invoke. |
| 58 | // |
| 59 | // Passing params as an array is a workaround that could be fixed in later versions of Go that |
| 60 | // prevent passing empty params. During testing it was discovered that this is an acceptable way of |
| 61 | // getting around not being able to pass params normally. |
| 62 | func (v *IDispatch) InvokeWithOptionalArgs(name string, dispatch int16, params []interface{}) (result *VARIANT, err error) { |
| 63 | displayID, err := v.GetSingleIDOfName(name) |
| 64 | if err != nil { |
| 65 | return |
| 66 | } |
| 67 | |
| 68 | if len(params) < 1 { |
| 69 | result, err = v.Invoke(displayID, dispatch) |
| 70 | } else { |
| 71 | result, err = v.Invoke(displayID, dispatch, params...) |
| 72 | } |
| 73 | |
| 74 | return |
| 75 | } |
| 76 | |
| 77 | // CallMethod invokes named function with arguments on object. |
| 78 | func (v *IDispatch) CallMethod(name string, params ...interface{}) (*VARIANT, error) { |
| 79 | return v.InvokeWithOptionalArgs(name, DISPATCH_METHOD, params) |
| 80 | } |
| 81 | |
| 82 | // GetProperty retrieves the property with the name with the ability to pass arguments. |
| 83 | // |
| 84 | // Most of the time you will not need to pass arguments as most objects do not allow for this |
| 85 | // feature. Or at least, should not allow for this feature. Some servers don't follow best practices |
| 86 | // and this is provided for those edge cases. |
| 87 | func (v *IDispatch) GetProperty(name string, params ...interface{}) (*VARIANT, error) { |
| 88 | return v.InvokeWithOptionalArgs(name, DISPATCH_PROPERTYGET, params) |
| 89 | } |
| 90 | |
| 91 | // PutProperty attempts to mutate a property in the object. |
| 92 | func (v *IDispatch) PutProperty(name string, params ...interface{}) (*VARIANT, error) { |
| 93 | return v.InvokeWithOptionalArgs(name, DISPATCH_PROPERTYPUT, params) |
| 94 | } |