在調(diào)試mapfile的時(shí)候，往往不知道怎么才能看到mapserver的執(zhí)行細(xì)節(jié)，所以，能查看日至不失為一個(gè)好的辦法。
在mapserver中使用日志的方法如下:

(1)在MAP中添加輸出日至文件

CONFIG "MS_ERRORFILE" "/tmp/map_error.log"

(2)在LAYER里面打開DEBUG
也就是設(shè)置DEBUG的級別。

DEBUG 5
根據(jù)mapserver的參考文檔，可以設(shè)置ON|OFF|0|1|2|3|4|5.
調(diào)試階段，設(shè)置成5，可以得到最多的輸出信息。

(3)實(shí)時(shí)查看日志
tail -f /tmp/map_error.log


(4)錯(cuò)誤調(diào)試
比如，我添加一個(gè)錯(cuò)誤的標(biāo)簽AAAA,系統(tǒng)輸出日志如下：
[Wed Sep  2 16:59:58 2009].311416 msPOSTGISLayerClose -- layerinfo is  NULL
[Wed Sep  2 17:12:25 2009].871161 loadLayer(): Unknown identifier. Parsing error near (AAAA):(line 149)
[Wed Sep  2 17:12:25 2009].888432 loadLayer(): Unknown identifier. Parsing error near (AAAA):(line 149)
[Wed Sep  2 17:12:25 2009].902453 loadLayer(): Unknown identifier. Parsing error near (AAAA):(line 149)
[Wed Sep  2 17:12:25 2009].907025 loadLayer(): Unknown identifier. Parsing error near (AAAA):(line 149)
[Wed Sep  2 17:12:25 2009].942961 loadLayer(): Unknown identifier. Parsing error near (AAAA):(line 149)
[Wed Sep  2 17:12:25 2009].972666 loadLayer(): Unknown identifier. Parsing error near (AAAA):(line 149)
[Wed Sep  2 17:12:25 2009].977157 loadLayer(): Unknown identifier. Parsing error near (AAAA):(line 149)
[Wed Sep  2 17:12:25 2009].998068 loadLayer(): Unknown identifier. Parsing error near (AAAA):(line 149)
[Wed Sep  2 17:12:25 2009].998070 loadLayer(): Unknown identifier. Parsing error near (AAAA):(line 149)
[Wed Sep  2 17:12:26 2009].19756 loadLayer(): Unknown identifier. Parsing error near (AAAA):(line 149)
[Wed Sep  2 17:12:26 2009].43084 loadLayer(): Unknown identifier. Parsing error near (AAAA):(line 149)
[Wed Sep  2 17:12:26 2009].51924 loadLayer(): Unknown identifier. Parsing error near (AAAA):(line 149)
[Wed Sep  2 17:12:26 2009].68473 loadLayer(): Unknown identifier. Parsing error near (AAAA):(line 149)
[Wed Sep  2 17:12:26 2009].73118 loadLayer(): Unknown identifier. Parsing error near (AAAA):(line 149)
[Wed Sep  2 17:12:26 2009].82840 loadLayer(): Unknown identifier. Parsing error near (AAAA):(line 149)
。。。。。。。。。。。。。

這樣，你就可以根據(jù)錯(cuò)誤信息很容易的找到錯(cuò)誤并更正錯(cuò)誤。




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