Adds link which launches file

# ps_add_launchlink

(PECL ps >= 1.1.0)

ps_add_launchlink — Adds link which launches file

### 说明

function ps_add_launchlink(
resource `$psdoc`,
float `$llx`,
float `$lly`,
float `$urx`,
float `$ury`,
string `$filename`
): bool

Places a hyperlink at the given position pointing to a file program which is being started when clicked on. The hyperlink's source position is a rectangle with its lower left corner at (llx, lly) and its upper right corner at (urx, ury). The rectangle has by default a thin blue border.

此说明在文档被打印或显示时不可见，只在文档用 Acrobat Distiller 或 Ghostview 转换成 PDF 时显示。

### 参数

`psdoc`

  Resource identifier of the postscript file as returned by ps_new().

`llx`

  The x-coordinate of the lower left corner.

`lly`

  The y-coordinate of the lower left corner.

`urx`

  The x-coordinate of the upper right corner.

`ury`

  The y-coordinate of the upper right corner.

`filename`

  The path of the program to be started, when the link is clicked on.

### 返回值

成功时返回 `true`， 或者在失败时返回 `false`。

### 参见

- ps_add_locallink() - Adds link to a page in the same document
- ps_add_pdflink() - Adds link to a page in a second pdf document
- ps_add_weblink() - Adds link to a web location

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