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