就是那一个字符串变量代替richedit.lines[i]
原来以为编译器会自动作这个优化的

02:01:27.499|[
02:01:27.499|[
02:01:27.509|[stream->richedit
02:01:27.660|]
02:01:27.660|[scan for index&page
02:01:29.102|]
02:01:29.102|[index->tree
02:01:29.673|]
02:01:29.693|]
02:01:29.693|]

02:01:53.266|[
02:01:53.266|[
02:01:53.276|[stream->richedit
02:01:53.407|]
02:01:53.407|[scan for index&page
02:01:54.839|]
02:01:54.839|[index->tree
02:01:55.420|]
02:01:55.440|]
02:01:55.450|]