unsigned long GetFileLength1 (FILE * fileName)
{
unsigned long pos = ftell(fileName);
unsigned long len = 0;
fseek ( fileName, 0L, SEEK_END );
len = ftell ( fileName );
fseek ( fileName, pos, SEEK_SET );
return len;
}
<方法二>利用stat
unsigned long GetFileLength2 (char * fileName)
{
struct stat buf;
int i = stat ( fileName, &buf );
if (i !=0)
MessageBox(NULL,"ERROR for STAT","ERROR",0);
return buf.st_size;
}
<方法三>利用filelength 必須include< fcntl.h>
原型: long filelength(int fd)
long GetFileLength3(char *fileName)
{
int fd = open(fileName,O_RDONLY | O_BINARY);
if(fd == -1 ) return -1;
long lsize = filelength(fd);
close(fd);
return lsize;
}
<方法四> 利用Windows API GetFileSize & GetFileSizeEx
Large File Size 請使用 GetFileSizeEx函式。
<方法五>利用Windows API FindFirstFile()
/// For Windows:
#include <windows.h>
double dblFileSize(const char* fname)
{
if (!fname && !*fname)
return 0.0;
HANDLE h;
WIN32_FIND_DATA info;
if ((h=FindFirstFile(fname,&info))
!= INVALID_HANDLE_VALUE)
{
FindClose(h);
if ((info.dwFileAttributes&FILE_ATTRIBUTE_DIRECTORY) == 0) // Is it a file?
{
union
{
struct { DWORD low, high; } lh;
__int64 size; // MS large int extension
} file;
file.lh.low = info.nFileSizeLow;
file.lh.high= info.nFileSizeHigh;
return file.size; // will be casted to double
}
// It's a directory, not a file
}
return 0.0; // No such name.
}
方法 1~3都無法處理大檔案，要注意~資料來源參考：這裡
