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functionftell<cstdio>longintftell(FILE*stream);GetcurrentpositioninstreamReturnsthecurrentvalueofthepositionindicatorofthestream.Forbinarystreams,thevaluereturnedcorrespondstothenumberofbytesfromthebeginningofthefile.Fortextstreams,thevalueisnotguaranteedtobetheexactnumberofbytesfromthebeginningofthefile,butthevaluereturnedcanstillbeusedtorestorethepositionindicatortothispositionusingHYPERLINK"http://www.cplusplus.com/fseek"fseek.ParametersstreamPointertoaHYPERLINK"http://www.cplusplus.com/FILE"FILEobjectthatidentifiesthestream.ReturnValueOnsuccess,thecurrentvalueofthepositionindicatorisreturned.Ifanerroroccurs,-1Lisreturned,andtheglobalvariableerrnoissettoapositivevalue.ThisvaluecanbeinterpretedbyHYPERLINK"http://www.cplusplus.com/perror"perror.Example123456789101112131415/*ftellexample:gettingsizeofafile*/#include<stdio.h>intmain(){FILE*pFile;longsize;pFile=fopen("myfile.txt","rb");if(pFile==NULL)perror("Erroropeningfile");else{fseek(pFile,0,SEEK_END);size=ftell(pFile);fclose(pFile);printf("Sizeofmyfile.txt:%ldbytes.\n",size);}return0;}Thisprogramprintsoutthesizeofmyfile.txtinbytes.
