Once the user selects a PDF document, the PDFViewer class needs to execute a command that it has exposed in the ActiveX control.
一旦用户选择了一个PD f文档，pdfviewer类就需要执行activex控件中所公开的命令。
Once the user selects a PDF document, the PDFViewer class needs to execute a command that it has exposed in the ActiveX control.
一旦用户选择了一个PD f文档，pdfviewer类就需要执行activex控件中所公开的命令。
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