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# View and modify Windows Sockets buffers

The following steps describe how to view, modify, and navigate through Winsock buffer data.

In this topic:

## Modify buffer data

You can modify buffer data in the Show Arguments dialog box for specific lrs steps in a Vuser script. You can use the Show Arguments dialog box to modify buffer data for the following steps:

- lrs_length_receive
- lrs_length_send
- lrs_receive
- lrs_receive_ex
- lrs_send

For further details on these steps, see the Function Reference.

To display the Show Arguments dialog box for any of the above steps, right-click a step in the Editor and select Show Arguments. A dialog box opens and displays the buffer data in the Buffer Content section of the dialog box.

Note: You cannot modify any data in the Snapshot pane

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## View and modify the data in the data.ws file

In the Solution Explorer, double-click the data.ws file. The contents of the data.ws file appear in the VuGen Editor. Modify the data directly in the Editor. For details, see Windows Sockets data.

Note: Although it is possible to modify data.ws files, it is recommended that you do not modify these files.

## View the data in the Snapshot pane

1. Ensure that the Snapshot pane is displayed.
2. Open the Vuser script in the Editor and select a step, or double-click an entry in the Step Navigator. The associated snapshot is displayed in the Snapshot pane. You cannot edit the snapshot data.

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## Navigate within the snapshot data

To navigate within the buffer data, display in the Snapshot pane, and then click Go to. The Go to Offset dialog box opens.

- To go to a specific offset within the buffer (absolute), select Go to offset and specify an offset value. Click Apply.

- To jump to a location relative to the cursor, click Advance by and specify the number of bytes to advance. To advance ahead, enter a positive value. To move backwards within the buffer, use a negative value. Click Apply.

- To select a range of data within the buffer, click Select range from and specify the beginning and end offsets. Click Apply.

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## Insert data into a buffer

You can insert a numerical value into a data buffer. You can insert the data as a single, double-byte, or 4-byte value. The following steps describe how to insert a number into a data buffer.

1. Copy the numerical data to be inserted to the clipboard.

2. Right-click a step in the Editor and select Show Arguments.
3. In the dialog box that opens, ensure that the Text View tab is displayed.
4. Under Buffer Content, right-click at the location in the buffer where you want to insert the data, and then select Advanced > Paste Byte or Advanced > Paste Short (2 bytes) or Advanced > Paste Long (4 bytes).

5. Click OK. VuGen inserts the data into the buffer.

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## Copy and paste blocks of data

You can modify the buffer data as characters, decimal numbers, or hexadecimal numbers. For details, see View and modify Windows Sockets buffers.

Note: You can edit buffer data only when you view the step arguments. You cannot edit buffer data in the Snapshot pane.

1. Right-click a step in the Editor and select Show Arguments. A dialog box opens and displays the buffer data in the Buffer Content section of the dialog box.

2. To copy buffer data:

- As characters, select one or more bytes and press Ctrl+C.

- As a decimal number, select one or more bytes, right-click in the selection and select Advanced > Copy As Decimal Number.

- As a hexadecimal number, select one or more bytes, right-click in the selection and select Advanced > Copy As Hexadecimal Number.

3. To paste the data:

- As characters, press Ctrl+V.

- As a single byte (assuming the size of the data on the clipboard is a single byte), right-click at the required location in the buffer and click Advanced > Paste Byte.

- In short format (2-byte), right-click at the required location in the buffer and click Advanced > Paste Short (2 bytes).

- In long format (4-byte), right-click at the required location in the buffer and click Advanced > Paste Long (4 bytes).

4. To delete data, select the data in the Text view, right-click inside the selection and select Delete.

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