i have read those doc,but i found those almost tell how to use commands in terminal to control rrd database.As for c api, there is little example about C api use thoese function which return a struct .my situation is if i want to check the value of .rrd file ,i can only to graph it to know it is right or error. or use rrdtool.exe to check the file. But i want to check the value in the program code.so how to handle the return value of rrd_fetch() function is important to me.thanks for your help
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