## DigitalSignature class

Signature in file.

```go

type DigitalSignature struct  {
	ptr unsafe.Pointer
}

```
## Constructors

| Method | Description |
| --- | --- |
|[NewDigitalSignature_Stream_String_String_Date](./newdigitalsignature_stream_string_string_date/) | Constructor of DigitalSignature. | 
|[NewDigitalSignature_String_String_String_Date](./newdigitalsignature_string_string_string_date/) | Constructor of DigitalSignature. | 

## Methods

| Method | Description |
| --- | --- |
|[IsNull](./isnull/) | Checks whether the implementation object is nullptr. | 
|[GetComments](./getcomments/) | The purpose to signature. | 
|[SetComments](./setcomments/) | The purpose to signature. | 
|[GetSignTime](./getsigntime/) | The time when the document was signed. | 
|[SetSignTime](./setsigntime/) | The time when the document was signed. | 
|[GetId](./getid/) | Specifies a GUID which can be cross-referenced with the GUID of the signature line stored in the document content.Default value is Empty (all zeroes) Guid. | 
|[SetId](./setid/) | Specifies a GUID which can be cross-referenced with the GUID of the signature line stored in the document content.Default value is Empty (all zeroes) Guid. | 
|[GetText](./gettext/) | Specifies the text of actual signature in the digital signature.Default value is Empty. | 
|[SetText](./settext/) | Specifies the text of actual signature in the digital signature.Default value is Empty. | 
|[GetImage](./getimage/) | Specifies an image for the digital signature.Default value is null. | 
|[SetImage](./setimage/) | Specifies an image for the digital signature.Default value is null. | 
|[GetProviderId](./getproviderid/) | Specifies the class ID of the signature provider.Default value is Empty (all zeroes) Guid. | 
|[SetProviderId](./setproviderid/) | Specifies the class ID of the signature provider.Default value is Empty (all zeroes) Guid. | 
|[IsValid](./isvalid/) | If this digital signature is valid and the document has not been tampered with,this value will be true. | 
|[GetXAdESType](./getxadestype/) | XAdES type.Default value is None(XAdES is off). | 
|[SetXAdESType](./setxadestype/) | XAdES type.Default value is None(XAdES is off). |