วิธี การ เปิด ADO
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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 |
ค่า ConnectModeEnum
| 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 |
ค่า StreamOpenOptionsEnum
| 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. |
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