Virtual application technology and private cloud computing provide enterprise IT managers with a new method of "centralized management, remote application". The network architecture it implements supports almost all current applications and easily implements remote access application modes.
For many applications, the printing function is indispensable. Compared with the virtual world of cloud data and cloud computing, printing is actually physical output, and it has to be obtained in the hand to complete. Whether the virtual application can be printed really depends on whether the virtual application is complete. In order to get the impression that the server-side virtual application is printed exactly like a local application, it is necessary to ensure and take into account the versatility and efficiency.
Currently, most remote access and virtual application products use the following printing modes:
1. Map printing. The basic principle is to map the client printer to the server, select the mapped printer output when printing, the network transmits the printer code to the client, and the client sends the printer directly.
There are many shortcomings in this mode: First, the printer driver matching the terminal printer needs to be installed on the server. As many printers as there are on the client, as many printer drivers as possible on the server. In addition, because the server's printing is kept at the hardware level, and the operating system does not isolate the session, the end user can see and select the "other's" printer, and a "flick" event of the wrong printer will occur. More fatal is that, according to different print drivers, the output is Postscript or ESC, PCL and other printer codes. The amount of data transmitted over the network is very large, which not only affects the printing speed, but also because the server operating system does not have a print pool buffer, when the print volume is relatively high When the time comes, there will be a phenomenon of "suffocating" the service.
2. Virtual printing. The principle is that the print output is converted into a standard format on the server side, and then decoded and printed after being transmitted to the client. The current general formats are Adobe PDF and MS XPS, the former conversion rate and compression rate are better.
No matter for server load or network transmission, the virtual printing mode is undoubtedly an inherent advantage over the mapping printing mode, but how to ensure the stability of the system operation and give users a better operating experience, the work of productized software still has A lot of space.
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