If the database connection fails, the connection error message may be output.
当数据库连接失败时，会输出连接错误消息。
Look back at Listing 7 and notice that while errors are handled, it's only a very generic error message that is output to the user.
回头再来看一下清单7，并注意在对错误进行处理时，只将少数常见的错误消息输出给用户了。
For example, when working with HTML output, you might want to redisplay the input form; however, when working with SOAP output, you'd probably want to display an error message instead.
例如，对于HTML输出，您可能想重新显示输入表单；但是，对于SOAP输出，您可能想要显示一条错误信息。
One detail you can't see from the output is that perror() writes its message to the standard error channel (stderr); the printf() call in Listing 1 is writing to the standard output channel (stdout).
您无法从输出中看到的一个细节是，perror() 将其消息写入标准错误通道 (stderr)；清单1中的printf()调用将写入标准输出通道 (stdout)。
Note the error message indicating that file6 does not exist and also the output for it with all the '?
注意，错误消息表示file6不存在，且其带有'?
Specifies the type of output message as either an error, warning, or informational.
指定输出讯息类型为错误、警告或告知性讯息。
To get help on a particular error message, either click the mouse on an error number in the Output window and press F1, or type the error number in the Look for box in the Index.
如需取得特定错误讯息的说明，请在 [输出]视窗中按一下错误代码并按下F1，或在 [索引] 的 [寻找]方块中输入错误代码。
To get help on a particular error message, either click the mouse on an error number in the Output window and press F1, or type the error number in the Look for box in the Index.
如需取得特定错误讯息的说明，请在 [输出]视窗中按一下错误代码并按下F1，或在 [索引] 的 [寻找]方块中输入错误代码。
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