| package ole |
| |
| import "unsafe" |
| |
| type IDispatch struct { |
| IUnknown |
| } |
| |
| type IDispatchVtbl struct { |
| IUnknownVtbl |
| GetTypeInfoCount uintptr |
| GetTypeInfo uintptr |
| GetIDsOfNames uintptr |
| Invoke uintptr |
| } |
| |
| func (v *IDispatch) VTable() *IDispatchVtbl { |
| return (*IDispatchVtbl)(unsafe.Pointer(v.RawVTable)) |
| } |
| |
| func (v *IDispatch) GetIDsOfName(names []string) (dispid []int32, err error) { |
| dispid, err = getIDsOfName(v, names) |
| return |
| } |
| |
| func (v *IDispatch) Invoke(dispid int32, dispatch int16, params ...interface{}) (result *VARIANT, err error) { |
| result, err = invoke(v, dispid, dispatch, params...) |
| return |
| } |
| |
| func (v *IDispatch) GetTypeInfoCount() (c uint32, err error) { |
| c, err = getTypeInfoCount(v) |
| return |
| } |
| |
| func (v *IDispatch) GetTypeInfo() (tinfo *ITypeInfo, err error) { |
| tinfo, err = getTypeInfo(v) |
| return |
| } |
| |
| // GetSingleIDOfName is a helper that returns single display ID for IDispatch name. |
| // |
| // This replaces the common pattern of attempting to get a single name from the list of available |
| // IDs. It gives the first ID, if it is available. |
| func (v *IDispatch) GetSingleIDOfName(name string) (displayID int32, err error) { |
| var displayIDs []int32 |
| displayIDs, err = v.GetIDsOfName([]string{name}) |
| if err != nil { |
| return |
| } |
| displayID = displayIDs[0] |
| return |
| } |
| |
| // InvokeWithOptionalArgs accepts arguments as an array, works like Invoke. |
| // |
| // Accepts name and will attempt to retrieve Display ID to pass to Invoke. |
| // |
| // Passing params as an array is a workaround that could be fixed in later versions of Go that |
| // prevent passing empty params. During testing it was discovered that this is an acceptable way of |
| // getting around not being able to pass params normally. |
| func (v *IDispatch) InvokeWithOptionalArgs(name string, dispatch int16, params []interface{}) (result *VARIANT, err error) { |
| displayID, err := v.GetSingleIDOfName(name) |
| if err != nil { |
| return |
| } |
| |
| if len(params) < 1 { |
| result, err = v.Invoke(displayID, dispatch) |
| } else { |
| result, err = v.Invoke(displayID, dispatch, params...) |
| } |
| |
| return |
| } |
| |
| // CallMethod invokes named function with arguments on object. |
| func (v *IDispatch) CallMethod(name string, params ...interface{}) (*VARIANT, error) { |
| return v.InvokeWithOptionalArgs(name, DISPATCH_METHOD, params) |
| } |
| |
| // GetProperty retrieves the property with the name with the ability to pass arguments. |
| // |
| // Most of the time you will not need to pass arguments as most objects do not allow for this |
| // feature. Or at least, should not allow for this feature. Some servers don't follow best practices |
| // and this is provided for those edge cases. |
| func (v *IDispatch) GetProperty(name string, params ...interface{}) (*VARIANT, error) { |
| return v.InvokeWithOptionalArgs(name, DISPATCH_PROPERTYGET, params) |
| } |
| |
| // PutProperty attempts to mutate a property in the object. |
| func (v *IDispatch) PutProperty(name string, params ...interface{}) (*VARIANT, error) { |
| return v.InvokeWithOptionalArgs(name, DISPATCH_PROPERTYPUT, params) |
| } |