mdfRemoveAttachment

Remove attachment from MDF-file

Since R2022a

Syntax

mdfRemoveAttachment(mdfFileName, attachmentFile)

Description

mdfRemoveAttachment(mdfFileName, attachmentFile) removes the attachmentFile from the specified mdfFileName.

To remove multiple files, call this function separately for each file.

Note

This function does not support MDF3 files.

Examples

Remove Attachment from MDF-File

Identify the files attached to an MDF-file and remove the unwanted one.

List the attached files from the MDF-file information struct.

info = mdfInfo("MDFFile.mf4");
info.Attachment.Name

ans =

    'inv_prelim.txt'


ans =

    'inv_final.txt'


ans =

    'inv_temp.txt'

Remove the unwanted attachment.

mdfRemoveAttachment("MDFFile.mf4","inv_temp.txt")

Input Arguments

mdfFileName — MDF-file name

string | char

MDF-file name, specified as a string or character vector, to remove the attachment from. The file name can be a relative or absolute path.

Depending on the location you are accessing, mdfFileName can take one of these forms.

Location	Form
Current folder or MATLAB® path	To access a file in the current folder or MATLAB path, specify the name of the file in filename, including the file extension. Example: "myMdfFile.mf4"
Other folders	To access a file in a folder other than the current folder, specify the full or relative path name in filename. Example: "C:\myFolder\myMdfFile.mf4" Example: "\dataDir\myMdfFile.mf4"
Remote locations	To access a file in a remote location, filename must contain the full path of the file specified as a uniform resource locator (URL) of the form: scheme://path_to_file/myMdfFile.mf4 Based on the remote location, scheme can be one of the values in this table. Remote Location scheme Amazon S3™ s3 Windows Azure® Blob Storage wasb, wasbs HDFS™ hdfs For more information, see Work with Remote Data. Example: "s3://bucketname/path_to_file/myMdfFile.mf4"

Example: "MDF_25Dec.mf4"

Data Types: char | string

attachmentFile — File to be removed

string | char

File to be removed, specified as a string or character vector. To precisely identify the attachment to remove, the specified file name string must exactly match the attachment name as stored in the MDF-file, which can be found in the Attachment.Name field of the file information struct returned by mdfInfo.

Example: "Inv_MDF_25Dec.txt"

Data Types: char | string

Version History

Introduced in R2022a

R2023a: Support for Remote File URLs

You can directly access MDF-file data stored at remote locations, including Amazon S3, Azure^® Blob Storage, and HDFS.