也就是在CreateFile的时候打开文件名指定: “\\.\Device”就可以了.
  因为代码比较短, 所以我不做注释, 相信大家看代码就能明白意思了.
  另外这里读写的都是软盘A盘第0扇区, 如果想读写其他的扇区, 那么可以使用API SetFilePointer.
  读扇区的方法(下面的代码演示从A盘的第0扇区读出数据, 写入到文件BOOT.BIN中):
 

 #include <windows.h>
  #include <assert.h>
  #include <stdio.h>
  void main()
  {
   HANDLE hFile;
   hFile = CreateFile("\\\\.\\A:",
   GENERIC_READ,
   FILE_SHARE_READ,
   NULL,
   OPEN_EXISTING,
   0,
   NULL);
   assert(hFile && "CreateFile failed!");
   PBYTE pBuffer = (PBYTE)malloc(512);
   assert(pBuffer && "Allocate memory failed!");
   DWORD dwLen;
   ReadFile(hFile, pBuffer, 512, &dwLen, NULL);
  
   FILE * fp;
   fp = fopen("boot.bin", "wb");
   assert(fp && "Open file failed!");
   fwrite(pBuffer, 512, 1, fp);
   fclose(fp);
   CloseHandle(hFile);
   free(pBuffer);
  }
  那么相应的, 写扇区的方法的就是这样的咯(以下代码演示从BOOT.BIN中读出数据写入到A盘第0扇区):
  #include <windows.h>
  #include <assert.h>
  #include <stdio.h>
  void main()
  {
   HANDLE hFile;
   hFile = CreateFile("\\\\.\\A:",
   GENERIC_WRITE,
   FILE_SHARE_WRITE,
   NULL,
   OPEN_EXISTING,
   0,
   NULL);
   assert(hFile && "CreateFile failed!");
   PBYTE pBuffer = (PBYTE)malloc(512);
   assert(pBuffer && "Allocate memory failed!");
  
   FILE * fp;
   fp = fopen("boot.bin", "rb");
   assert(fp && "Open file failed!");
   fread(pBuffer, 512, 1, fp);
   fclose(fp);
  
   DWORD dwLen;
   WriteFile(hFile, pBuffer, 512, &dwLen, NULL);
   CloseHandle(hFile);
   free(pBuffer);
  }
04-30 10:54