# ADO Open Method

Complete Stream Object Reference

The Open method is used to open a Stream object.

### Syntax

objStream.Open source,mode,opt,username,psword

Parameter | Description
--- | ---
source | Optional. The data source for the Stream object (a URL that points to an existing node in a tree structure, like an e-mail or file system or a reference to an already opened Record object). If source is not specified, a new Stream object, with a size of zero, will be created and opened
mode | Optional. A ConnectModeEnum value that specifies the access mode for a Stream object. Default is adModeUnknown
opt | Optional. A StreamOpenOptionsEnum value that specifies options for opening a Stream object. Default is adOpenStreamUnspecified
username | Optional. A name of a user who can access the Stream object. If Source is an already opened Record, this parameter is not specified
psword | Optional. A password that validates the username. If Source is an already opened Record, this parameter is not specified

### ConnectModeEnum Values

Constant | Value | Description
--- | --- | ---
adModeUnknown | 0 | Default. Permissions have not been set or cannot be determined
adModeRead | 1 | Read-only
adModeWrite | 2 | Write-only
adModeReadWrite | 3 | Read/write
adModeShareDenyRead | 4 | Prevents others from opening a connection with read permissions
adModeShareDenyWrite | 8 | Prevents others from opening a connection with write permissions
adModeShareExclusive | 12 | Prevents others from opening a connection
adModeShareDenyNone | 16 | Allows others to open a connection with any permissions
adModeRecursive | 0x400000 | Used with adModeShareDenyNone, adModeShareDenyWrite, or adModeShareDenyRead to set permissions on all sub-records of the current Record

### StreamOpenOptionsEnum Values

Constant | Value | Description
--- | --- | ---
adOpenStreamUnspecified | -1 | Default. Opens the Stream object with default options
adOpenStreamAsync | 1 | Opens the Stream object in asynchronous mode
adOpenStreamFromRecord | 4 | Identifies the contents of the Source parameter to be an already open Record object. The default behavior is to treat Source as a URL that points directly to a node in a tree structure. The default stream associated with that node is opened.

Complete Stream Object Reference

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