windows read write 高级应用 文件复制

C语言 文件复制

#include <sys/types.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/stat.h>

#define BLKSIZE 255
int main(int argc, char *argv[])
{

    int fdr,fdw;
    int r_size;
    int iFlen;
    int iBlock = 0;
    char temp[255];
    char filepath[255];
    char fileto[255];

    struct    stat stbuf;

    printf("please input the filepath:");

    //    scanf("%s",filepath);
    strcpy(filepath, argv[1]);
    //    fdr = open(argv[1], O_RDONLY|O_BINARY, S_IREAD);
//    fdr = _open(argv[1], O_BINARY);
    fdr = _open(argv[1], O_RDONLY | O_BINARY, S_IWRITE | S_IREAD);
    //    if((fdr=open(filepath,O_RDONLY))==-1)
    if( fdr==-1 )
    {
        printf("file not found,open failed!");
        return -1;
    }
    else
    {

        //        iFlen = lseek( fdr, 0L, SEEK_END );
        stbuf.st_size = 0 ;
        stat(filepath,&stbuf);
        iFlen = stbuf.st_size;
        iBlock = BLKSIZE;
        fdw = _open(argv[2], O_WRONLY|O_CREAT|O_BINARY , 0777);
        //        fdw = open(argv[2], O_RDONLY|O_BINARY, S_IREAD);
        for(;;)
        {
            if(iFlen >BLKSIZE)
                iBlock = BLKSIZE;
            else
                iBlock = iFlen ;
            memset(temp, 0x00, sizeof(temp));
            r_size=_read(fdr,temp,iBlock);
            if(r_size != iBlock)
            {
                printf("读数据失败!!!!!!!!!!!![%d, %s]\n", errno, strerror(errno));
                printf("%d, %d\n", r_size , iBlock);
                close(fdr);
                break;
            }
            _write(fdw, temp,iBlock);
            iFlen -=BLKSIZE;
            if(iFlen <= 0 )
            {
                printf("完成读取文件!!!!\n");
                break;
            }
        }
        close(fdw);
        close(fdr);
        printf("\n");
        printf("uuuuuuuuuu,[%d,%s\n", iFlen, temp);
        /*
        while(r_size=read(fdr,temp,255) > 0)
        {
        printf("uuuuuuuuuu,%s\n", temp);
        }
        close(fdr);
        sprintf(fileto,"file-rw.txt");
        if((fdw=open(fileto,O_WRONLY|O_CREAT,0640))==-1)
        {
        printf("open failed!");
        return -1;
        }
        else
        {
        int w_size=write(fdw,temp,r_size);//相当于复制了所输入文件.txt中的255个大小的字符串到新文件file-rw.txt中
        close(fdw);
        printf("have successfully copied 255 chars from \"%s\" to \"%s\"\n",filepath,fileto);
        }
        */

    }

    return 0;

}