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c++ Programming Glossary: seekgc++ fastest way to read only last line of text file? http://stackoverflow.com/questions/11876290/c-fastest-way-to-read-only-last-line-of-text-file c iostream seek share improve this question Use seekg to jump to the end of the file then read back until you find.. test.txt ifstream fin fin.open filename if fin.is_open fin.seekg 1 ios_base end go to one spot before the EOF bool keepLooping.. 1 If the data was at or before the 0th byte fin.seekg 0 The first line is the last line keepLooping false So stop..
JNI in C++ to read file to jbyteArray http://stackoverflow.com/questions/12854333/jni-in-c-to-read-file-to-jbytearray env jobject obj ifstream fl home rkannan myFile.txt fl.seekg 0 ios end size_t len fl.tellg char ret new char len fl.seekg.. 0 ios end size_t len fl.tellg char ret new char len fl.seekg 0 ios beg fl.read ret len fl.close int i 0 jbyte a1 null while.. tmp ccKCiEKq.o std basic_istream char std char_traits char seekg long long std _Ios_Seekdir 0x31c var tmp ccKCiEKq.o std basic_istream..
Read from same file (until EOF) using ifstream after file contents change http://stackoverflow.com/questions/1867067/read-from-same-file-until-eof-using-ifstream-after-file-contents-change from4to5 ios binary Get the size of the file Read.seekg 0 ios end length Read.tellg Read.seekg 0 ios beg for i 0 i length.. of the file Read.seekg 0 ios end length Read.tellg Read.seekg 0 ios beg for i 0 i length i buffer i 16 ' 0' Read the file.. to modify this to suit my requirement. I tried using the seekg call but somehow failed. I was wondering if when the first time..
C++: Getting incorrect file size http://stackoverflow.com/questions/2282549/c-getting-incorrect-file-size with a size of 210732 bytes but the size reported with seekg tellg is 210728. I get the following information from ls la.. handle.open output.osr std ios binary std ios in handle.seekg 0 std ios end std cout file size static_cast unsigned int handle.tellg.. test.txt ios binary std ios in get length of file is.seekg 0 ios end length is.tellg is.seekg 0 ios beg cout Length length..
http://stackoverflow.com/questions/2547355/c-file-bad-bit file bad bit when I run this code the open and seekg and tellg operation all success. but when I read it it fails.. rifile . ri reverseindex.bin ios in ios binary rifile.seekg blockid RI_BLOCK_SIZE ios beg if rifile.good cout block not.. fails. In other words checking rifile.good after calling seekg may not accomplish anything. As Andrey suggested checking errno..
Is std::ifstream significantly slower than FILE? http://stackoverflow.com/questions/477225/is-stdifstream-significantly-slower-than-file so the only functions I'm using are get peek and tellg seekg . Update I profiled and got confusing output gprof didn't appear.. by about 100x. I think the problem may have been the tellg seekg that took a long time but gprof may have been unable to see..
http://stackoverflow.com/questions/485649/confusing-gprof-output man info ru_RU a_doc_lib cmds aixcmds2 gprof.htm . In fact seekg and tellg were not even on the profiling list and they were..
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