以文件结束结尾是什么意思

2015-01-30 09:24:01 902 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

FFmpeg转换器转码结束分析也有可能会返回 AVERROR_EOF，前提是，你之前已经给这个编码器发送过一次 null 的。也有可能会返回 AVERROR_EOF，不过前提是，你之前已经给这个解码器发送过一次。选项，限制只输出 60 秒的数据到文件保存，一旦存储够了 60 秒，就会自动退出。的返回值，我个人觉得根本没用到，好几个地方即使返回 1，也会转成 0。之后，一直读解码器，读到没有数据了，就会返回 AVERROR_EOF。的返回值没用，但是当它传递 NULL，执行完之后，解码器的所有。阅读详情

有些编程题目会写：测试数据有多组,以文件结尾。请问应该如何使用测试数据？什么叫以文件结束结尾。

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蜥蜴枪王 2015-01-31

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就是指读到文件末尾，有预定义常量EOF来标识。

赵4老师 2015-01-30

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fscanf, fwscanf Read formatted data from a stream. int fscanf( FILE *stream, const char *format [, argument ]... ); int fwscanf( FILE *stream, const wchar_t *format [, argument ]... ); Function Required Header Compatibility fscanf <stdio.h> ANSI, Win 95, Win NT fwscanf <stdio.h> or <wchar.h> ANSI, Win 95, Win NT For additional compatibility information, see Compatibility in the Introduction. Libraries LIBC.LIB Single thread static library, retail version LIBCMT.LIB Multithread static library, retail version MSVCRT.LIB Import library for MSVCRT.DLL, retail version Return Value Each of these functions returns the number of fields successfully converted and assigned; the return value does not include fields that were read but not assigned. A return value of 0 indicates that no fields were assigned. If an error occurs, or if the end of the file stream is reached before the first conversion, the return value is EOF for fscanf or WEOF for fwscanf. Parameters stream Pointer to FILE structure format Format-control string argument Optional arguments Remarks The fscanf function reads data from the current position of stream into the locations given by argument (if any). Each argument must be a pointer to a variable of a type that corresponds to a type specifier in format. format controls the interpretation of the input fields and has the same form and function as the format argument for scanf; see scanf for a description of format. If copying takes place between strings that overlap, the behavior is undefined. fwscanf is a wide-character version of fscanf; the format argument to fwscanf is a wide-character string. These functions behave identically otherwise. Generic-Text Routine Mappings TCHAR.H Routine _UNICODE & _MBCS Not Defined _MBCS Defined _UNICODE Defined _ftscanf fscanf fscanf fwscanf For more information, see Format Specification Fields – scanf functions and wscanf Functions. Example /* FSCANF.C: This program writes formatted * data to a file. It then uses fscanf to * read the various data back from the file. */ #include <stdio.h> FILE *stream; void main( void ) { long l; float fp; char s[81]; char c; stream = fopen( "fscanf.out", "w+" ); if( stream == NULL ) printf( "The file fscanf.out was not opened\n" ); else { fprintf( stream, "%s %ld %f%c", "a-string", 65000, 3.14159, 'x' ); /* Set pointer to beginning of file: */ fseek( stream, 0L, SEEK_SET ); /* Read data back from file: */ fscanf( stream, "%s", s ); fscanf( stream, "%ld", &l ); fscanf( stream, "%f", &fp ); fscanf( stream, "%c", &c ); /* Output data read: */ printf( "%s\n", s ); printf( "%ld\n", l ); printf( "%f\n", fp ); printf( "%c\n", c ); fclose( stream ); } } Output a-string 65000 3.141590 x Stream I/O Routines See Also _cscanf, fprintf, scanf, sscanf