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使用 Qt 部署应用程序时，未显示可用打印机列表。Dependency walker 没有报告任何问题。
The plugin printsupport has to be supplied together with the deployed application.
Go to: C:\Qt\Qt5.2.1\5.2.1\mingw48_32\plugins (or whereever you installed Qt) and find the printsupport folder. Copy this folder to the same location as your exe.