C/C++ 获取文件长度（转）
C/C++ 获取文件长度（转）
（一）
对文件操作时有时获得文件的大小时必要的.下面是获得其大小小的较简单方法.
#include //C 语言头文件
#include //for system();
using namespace std;
int main()
{
int handle;
handle = open("test.txt", 0x0100); //open file for read
long length = filelength(handle); //get length of file
cout<<"file length in bytes:"<
#include //for windows api
using namespace std;
int main()
{
//用API函数CreateFile()创建文件句柄
HANDLE fhadle = CreateFile("file.txt", //文件名或路径
0,
0,
0,
OPEN_EXISTING, //文件存在则打开并读取
0,
0);
DWORD size = GetFileSize(fhadle,0);
cout<<"size:"<
#include
using namespace std;
int main(int argc, char* argv[])
{
ifstream in("file.txt");
in.seekg(0, ios::end); //设置文件指针到文件流的尾部
streampos ps = in.tellg(); //读取文件指针的位置
cout << "File size: " << ps << endl;
in.close(); //关闭文件流
return 0;
}
（四）
在VC中，CFILE的GetLength()函数可直接得到大小：
CFile cf;
// Attempt to open thefile for reading.
if( !cf.Open( pszFilename, CFile::modeRead ) )
return( FALSE );
// Get the size of the file and store
// in a local variable. .
DWORD dwSize;
dwDibSize = cf.GetLength();
(五)
#include ;
#include ;
long
get_filesize(char *filename)
{
struct stat f_stat;
if (stat(filename, &f_stat) == -1) {
return -1;
}
return (long)f_stat.st_size;
}
(六)
int main(void)
{
struct stat statbuf;
FILE *stream;
/* open a file for update */
if ((stream = fopen(FILENAME, "w+")) == NULL)
{
fprintf(stderr, "Cannot open output file./n");
return(1);
}
/* get information about the file */
stat(FILENAME, &statbuf);
fclose(stream);
/* display the information returned */
if (statbuf.st_mode & S_IFCHR)
printf("Handle refers to a device./n");
if (statbuf.st_mode & S_IFREG)
printf("Handle refers to an ordinary file./n");
if (statbuf.st_mode & S_IREAD)
printf("User has read permission on file./n");
if (statbuf.st_mode & S_IWRITE)
printf("User has write permission on file./n");
printf("Drive letter of file: %c/n", "A"+statbuf.st_dev);
printf("Size of file in bytes: %ld/n", statbuf.st_size);
printf("Time file last opened: %s/n", ctime(&statbuf.st_ctime));
return 0;
}
(七)
#include ;
#include ;
#include ;
#include ;
#include ;
int main(void)
{
int handle;
char msg[] = "This is a test";
char ch;
/* create a file */
handle = open("TEST.$$$", O_CREAT | O_RDWR, S_IREAD | S_IWRITE);
/* write some data to the file */
write(handle, msg, strlen(msg));
/* seek to the beginning of the file */
lseek(handle, 0L, SEEK_SET);
/* reads chars from the file until we hit EOF */
do
{
read(handle, &ch, 1);
printf("%c", ch);
} while (!eof(handle));
close(handle);
return 0;
}
来自: http://hi.baidu.com/ignorer/blog/item/274276091ab8eea32fddd42c.html
声明：该文观点仅代表作者本人，牛骨文系教育信息发布平台，牛骨文仅提供信息存储空间服务。
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