AddImageFileFromMemory Method of the FRDocument Object
This method opens an image file from the global memory, where it was previously loaded by the user, and adds the pages corresponding to the opened file to the document.
HRESULT AddImageFileFromMemory( __int64 HGlobal, IImagePasswordCallback* Callback, IPrepareImageMode* PrepareMode, IIntsCollection* PageIndices, BSTR FileName );
void AddImageFileFromMemory( Int64 HGlobal, IImagePasswordCallback Callback, IPrepareImageMode PrepareMode, IIntsCollection PageIndices, string FileName );
Visual Basic .NET
Sub AddImageFileFromMemory( _ HGlobal As Int64, _ Callback As IImagePasswordCallback, _ [PrepareMode As IPrepareImageMode = Nothing], _ [PageIndices As IIntsCollection = Nothing], _ [FileName As String = "0"] _ )
- [in] Specifies the HGLOBAL handle of the memory block which contains the image file. The handle is passed as __int64. This handle should be valid.
- [in] This variable refers to the interface of the user-implemented object of the type ImagePasswordCallback which is used to handle possible password requests for accessing images in PDF format. This parameter is optional and may be 0, in which case password-protected files cannot be processed.
- [in] Refers to the PrepareImageMode object which specifies how an image will be preprocessed during opening. This parameter is optional and may be 0, in which case either the default parameters are used, or, if a profile has been loaded, the parameters set by this profile are used.
- [in] This parameter refers to the IntsCollection object which specifies the indices of the pages which have to be added to the document. This parameter is optional and may be 0, in which case all the pages of the opened file will be added to the document.
- [in] Specifies the name of the image file. This information is used to define the format of the file, if not explicitly specified, and in error messages. This parameter is optional and may be 0. For opening the office formats, pass the name of the document with its extension.
This method has no specific return values. It returns the standard return values of ABBYY FineReader Engine functions.
- When opening a PDF Portfolio file using this method, its cover is always included in the output file.
- This method may report events to the listeners attached to the IConnectionPointContainer interface of the FRDocument object.
- If your license includes the Office Formats Opening module, you may also use this method to open digital documents of supported formats.
- This method does not work if the Engine object is created using the OutprocLoader object. Consider using AddImageFileFromStream method in this case.
- Depending on the value of the IEngine::MultiProcessingParams property, ABBYY FineReader Engine can distribute opening of multi-page documents to CPU cores.
- This method does not support WIC-compatible files opening.
// This sample shows how an image file can be loaded to memory // and then added for processing to FineReader Engine ... // In this code sample we use the System.IO namespace for operation with a file in memory using System.IO; // and the System.Runtime.InteropServices namespace for working with blocks in memory using System.Runtime.InteropServices; ... // We assume that we have already created the Engine object // Create document FREngine.IFRDocument document = engine.CreateFRDocument(); // Source image string imagePath = "D:\\Demo.tif"; FileInfo file = new FileInfo(imagePath); // Length of the source image long len = file.Length; // Open the image BinaryReader br = new BinaryReader(File.Open(imagePath, FileMode.Open)); // Read the specified number of bytes from the current stream into a byte array byte byteArray = br.ReadBytes((int)len); // Allocate a block of memory IntPtr handle = Marshal.AllocHGlobal((int)len); // Copy data from an unmanaged memory pointer to a managed 32-bit signed integer array Marshal.Copy(byteArray, 0, handle, (int)len); // Add image from memory to document document.AddImageFileFromMemory((Int64)handle, null, null, null, "Demo.tif"); // Free memory previously allocated from the unmanaged memory of the process Marshal.FreeHGlobal(handle); // Recognize document document.Process(null);
3/24/2023 8:51:52 AM