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从 C 程序打印文件到打印机的正确方法是什么？
命令system("lpr /tmp/filename.prn");生成错误lpr: No file in print request。
system("lpr /tmp/filename.prn");
lpr: No file in print request
命令行中的相同命令完美运行。
操作系统是 Debian 9.2，内核 4.9.0，cups 是 2.2.1-8 版本