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DOS开发编程 & 发展交流（开发室） » Reading and writing large dbf files in C

Floor1　liyangwyh	Posted 2010-01-21 11:11
初级用户　Posts 24　Credits 72
I'm reading records in a dbf line by line in C under DOS, and it freezes when the data file gets large. fseek(fp, headlength, 0); /* Position the file pointer to the start of the first record */ for (recno = 1; recno <= recnumber; recno++) { fgets(str, reclength + 1, fp); printf("%u, %s\n", recno, str); } Does anyone have any good methods to solve this?

Floor2　mmxx0212	Posted 2010-01-21 12:00
新手上路　Posts 8　Credits 18
Can you find if there are any header files for DBF file operations?

Floor3　mmxx0212	Posted 2010-01-21 12:03
新手上路　Posts 8　Credits 18
Please provide the specific Chinese content that needs to be translated so that I can carry out the translation according to the requirements.

Floor4　liyangwyh	Posted 2010-01-21 12:46
初级用户　Posts 24　Credits 72
Thanks everyone, the problem is found. It's that the space of str is too small and the data content exceeds it

Floor5　firstsail	Posted 2010-01-21 12:53
高级用户　Posts 295　Credits 668　From 广东深圳
This is too easy to understand, Your recno is of type unsigned int, and the record number recnumber is of type unsinged long, so no matter how much recno is incremented, it can only change within 0~65535u. If recno is of type unsigned long, then printf("%u, %s\n",recno, str) should be changed to printf("%lu, %s\n",recno, str);