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The Convert PDF service converts PDF documents to PostScript and to a number of image formats (JPEG, JPEG 2000, PNG, and TIFF). Converting a PDF document to PostScript is useful for unattended server-based printing on any PostScript printer. Converting a PDF document to a multipage TIFF file is practical when archiving documents in content management systems that do not support PDF documents.
You can accomplish these tasks using the Convert PDF service:
Convert PDF documents to PostScript.
Convert PDF documents to image formats.
Note: For more information about the Convert PDF service, see Services Reference for AEM Forms.
This topic describes how you can use the Convert PDF Service API (Java and web service) to programmatically convert PDF documents to PostScript files. The PDF document that is converted to a PostScript file must be a non-interactive PDF document. That is, if you attempt to convert an interactive PDF document to a PostScript file, an exception is thrown.
Note:
For more information about the Convert PDF service, see Services Reference for AEM Forms.
Include the necessary files into your development project. If you are creating a client application by using Java, include the necessary JAR files. If you are using web services, make sure you include the proxy files.
Before you can programmatically perform a Convert PDF service operation, you must create a Convert PDF service client. If you are using the Java API, create a ConvertPdfServiceClient object. If you are using the web service API, create a ConvertPDFServiceService object.
This section uses web service functionality that is introduced in AEM Forms. To access new functionality, you have to construct your proxy object using the lc_version attribute. (See “Accessing new functionality using web services” in Invoking AEM Forms using Web Services.)
Reference the PDF document that you want to convert to a PostScript file. As stated earlier in this topic, the PDF document must be a non-interactive PDF document. If you attempt to convert an interactive PDF document to a PostScript file, an exception is thrown.
When converting a PDF document to a PostScript file, you can define run-time options that specify the PostScript type that is created. For example, you can define a level 3 PostScript file.
Typically, the generated PostScript file will reflect the size of input PDF document. If you select the ShrinkToFit option (which shrinks the output of the PostScript file to fit the page), you will not see a difference between the input PDF document and the generated PostScript file. The ShrinkToFit option takes effect only if you select to print on a smaller page size than the input PDF document. To select a smaller page size, define the PageSize option. In addition, it is recommended that you set the RotateAndCenter option to true to obtain the correct PostScript output.
Likewise, if you select the ExpandToFit option (which expands the output of the PostScript file to fit the page), it takes effect only if you select to print on a larger page size than the input PDF document. To select a larger page size, define the PageSize option. In addition, it is recommended that you set the RotateAndCenter option to true to obtain the correct PostScript output.
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For information about the run-time values that you can set, see the ToPSOptionsSpec class reference in AEM Forms API Reference.
After you create the service client and set run-time options, you can invoke the PostScript conversion operation. This operation will need information about the document to convert, including the preferred PostScript level for the target document.
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Create a java.io.FileInputStream object by using its constructor and pass a string value that specifies the location of the PDF document to convert.
Create a com.adobe.idp.Document object that stores the PDF document by using the com.adobe.idp.Document constructor. Pass the java.io.FileInputStream object that contains the PDF document.
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Create a ToPSOptionsSpec object by invoking its constructor.
Set run-time options by invoking an appropriate method that belongs to the ToPSOptionsSpec object. For example, to define the PostScript level that is created, invoke the ToPSOptionsSpec object’s setPsLevel method and pass a PSLevel enumeration value that specifies the PostScript level. For information about all run-time values that you can set, see the ToPSOptionsSpec class reference in AEM Forms API Reference.
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Convert the PDF document to a PostScript file.
Invoke the ConvertPdfServiceClient object’s toPS2 method and pass the following values:
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Create a ConvertPdfServiceClient object by using its default constructor.
Create a ConvertPdfServiceClient.Endpoint.Address object by using the System.ServiceModel.EndpointAddress constructor. Pass a string value that specifies the WSDL to the AEM Forms service (for example, http://localhost:8080/soap/services/ConvertPDFService?blob=mtom.) You do not need to use the lc_version attribute. However, specify ?blob=mtom.
Create a System.ServiceModel.BasicHttpBinding object by getting the value of the ConvertPdfServiceClient.Endpoint.Binding field. Cast the return value to BasicHttpBinding.
Set the System.ServiceModel.BasicHttpBinding object’s MessageEncoding field to WSMessageEncoding.Mtom. This value ensures that MTOM is used.
Enable basic HTTP authentication by performing the following tasks:
Assign the AEM forms user name to the field ConvertPdfServiceClient.ClientCredentials.UserName.UserName.
Assign the corresponding password value to the field ConvertPdfServiceClient.ClientCredentials.UserName.Password.
Assign the constant value HttpClientCredentialType.Basic to the field BasicHttpBindingSecurity.Transport.ClientCredentialType.
Assign the constant value BasicHttpSecurityMode.TransportCredentialOnly to the field BasicHttpBindingSecurity.Security.Mode.
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Create a BLOB object by using its constructor. The BLOB object is used to store a PDF document that is converted to a PostScript file.
Create a System.IO.FileStream object by invoking its constructor and passing a string value that represents the file location of the PDF document to convert and the mode to open the file in.
Create a byte array that stores the content of the System.IO.FileStream object. You can determine the size of the byte array by getting the System.IO.FileStream object’s Length property.
Populate the byte array with stream data by invoking the System.IO.FileStream object’s Read method and passing the byte array, starting position, and stream length to read.
Populate the BLOB object by assigning its MTOM field with the contents of the byte array.
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Create a System.IO.FileStream object by invoking its constructor. Pass a string value that represents the file location of the PS file.
Create a byte array that stores the data content of the BLOB object that was returned by the encryptPDFUsingPassword method. Populate the byte array by getting the value of the BLOB object’s MTOM field.
Create a System.IO.BinaryWriter object by invoking its constructor and passing the System.IO.FileStream object.
Write the contents of the byte array to the PostScript file by invoking the System.IO.BinaryWriter object’s Write method and passing the byte array.
You can use the Convert PDF service to programmatically convert PDF documents to image formats, which include JPEG, JPEG 2000, TIFF, and PNG. By converting a PDF document to an image file, you can use the PDF document as an image file. For example, you can place the image in an enterprise content management system for storage.
When converting a PDF document to an image, the Convert PDF service creates a separate image for each page in the document. That is, if the document has 20 pages, the Convert PDF service creates 20 image files. When converting a PDF document to an image format, you can create individual images for each page within the PDF document or a single image file for the entire PDF document.
Note:
For more information about the Convert PDF service, see Services Reference for AEM Forms.
Include the necessary files into your development project. If you are creating a client application by using Java, include the necessary JAR files. If you are using web services, make sure you include the proxy files.
Before you can programmatically perform a Convert PDF service operation, you must create a Convert PDF service client. If you are using the Java API, create a ConvertPdfServiceClient object. If you are using the web service API, create a ConvertPDFServiceService object.
You must retrieve the PDF document to convert to an image. You cannot convert an interactive PDF document to an image. If you attempt to do so, an exception is thrown. To convert an interactive PDF document to an image file, you must flatten the PDF document before you convert it. (See Flattening PDF Documents.)
You must set run-time options such as the image format and the resolution values. For information about the run-time values, see the ToImageOptionsSpec class reference in AEM Forms API Reference.
After you create the service client and set run-time options, you can convert the PDF document to an image. A collection object that contains the images is returned.
You can retrieve image files from a collection object that the Convert PDF service returns. Each element in the collection is a com.adobe.idp.Document instance (or a BLOB instance if you are using web services) that you can save as an image file, such as a JPG file.
The format of the image file is dependent on the ImageConvertFormat run-time option. That is, if you set the ImageConvertFormat run-time option to ImageConvertFormat.JPEG, you can save image files as JPG files.
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Create a ToImageOptionsSpec object by using its constructor.
Invoke methods that belong to this object as required. For example, set the image type by invoking the setImageConvertFormat method and passing an ImageConvertFormat enum value that specifies the format type.
Note:
Setting the ImageConvertFormat enumeration value is mandatory.
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Convert the PDF to an image.
Invoke the ConvertPdfServiceClient object’s toImage2 method and pass the following values:
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Create a ConvertPdfServiceClient object by using its default constructor.
Create a ConvertPdfServiceClient.Endpoint.Address object by using the System.ServiceModel.EndpointAddress constructor. Pass a string value that specifies the WSDL to the AEM Forms service (for example, http://localhost:8080/soap/services/ConvertPDFService?blob=mtom.) You do not need to use the lc_version attribute. However, specify ?blob=mtom.
Create a System.ServiceModel.BasicHttpBinding object by getting the value of the ConvertPdfServiceClient.Endpoint.Binding field. Cast the return value to BasicHttpBinding.
Set the System.ServiceModel.BasicHttpBinding object’s MessageEncoding field to WSMessageEncoding.Mtom. This value ensures that MTOM is used.
Enable basic HTTP authentication by performing the following tasks:
Assign the AEM forms user name to the field ConvertPdfServiceClient.ClientCredentials.UserName.UserName.
Assign the corresponding password value to the field ConvertPdfServiceClient.ClientCredentials.UserName.Password.
Assign the constant value HttpClientCredentialType.Basic to the field BasicHttpBindingSecurity.Transport.ClientCredentialType.
Assign the constant value BasicHttpSecurityMode.TransportCredentialOnly to the field BasicHttpBindingSecurity.Security.Mode.
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Create a BLOB object by using its constructor. This BLOB object is used to store the PDF form.
Create a System.IO.FileStream object by invoking its constructor. Pass a string value that specifies the location of the PDF form and the mode to open the file in.
Create a byte array that stores the content of the System.IO.FileStream object. Determine the size of the byte array by getting the System.IO.FileStream object’s Length property.
Populate the byte array with stream data by invoking the System.IO.FileStream object’s Read method. Pass the byte array, the starting position, and the stream length to read.
Populate the BLOB object by assigning its MTOM field with the contents of the byte array.
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Create a ToImageOptionsSpec object by using its constructor.
Invoke methods that belong to this object as required. For example, set the image type by invoking the setImageConvertFormat method and passing an ImageConvertFormat enumeration value that specifies the format type.
Note:
Setting the ImageConvertFormat enumeration value is mandatory.