Question

我写了一个bittorrent客户端并成功下载所有文件的所有部分。

在我写文件（mode='wr'）之前和之后，我打印出文件名，piece_index，写入的字节数，以及写入字节的文件中的偏移量。写完所有文件后，我关闭文件。

但是，当我查看磁盘时，只写了第一部分。该部分完全写入文件0和文件1的开头字节。即使打印语句显示所有剩余部分都写入文件1，文件1也没有。 file.seek，file.write中没有错误。这是一些输出：

-- first piece --    
offset: 0 piece_index: 0
about to write file 0: offset 0 start 0 nbytes 291
Distributed by Mininova.txt
just wrote 291 bytes at offset 0

about to write file 1: offset 0 start 291 nbytes 1048285    
DF self-extracting archive.exe
just wrote 1048285 bytes at offset 0

-- next piece --
offset: 1048285 piece_index: 1
about to write file 1: offset 1048285 start 1048576 nbytes 1048576
DF self-extracting archive.exe
just wrote 1048576 bytes at offset 1048285

-- next piece --
offset: 2096861 piece_index: 2 file_index: 1
about to write file 1: offset 2096861 start 2097152 nbytes 1048576
DF self-extracting archive.exe
just wrote 1048576 bytes at offset 2096861

代码：

def _write(self, fd, offset, start, num_bytes, row):
    print(fd.name[-30:])
    fd.seek(offset)  
    fd.write(self.buffer[row][start:start+num_bytes].tobytes())
    fd.seek(0)
    print('just wrote {} bytes at offset {}\n'.format(num_bytes, offset))

Answer 1

这应该做：

@bindable({
  name:'myProperty', //name of the property on the class
  attribute:'my-property', //name of the attribute in HTML
  changeHandler:'myPropertyChanged', //name of the method to invoke when the property changes
  defaultBindingMode: ONE_WAY, //default binding mode used with the .bind command
  defaultValue: undefined //default value of the property, if not bound or set in HTML
})

计算实际写入的字节数：def _write(self, fd, offset, start, num_bytes, row): print(fd.name[-30:]) fd.seek(offset) bytes_ = self.buffer[row][start:start+num_bytes].tobytes() fd.write(bytes_) fd.flush() fd.seek(0) print('just wrote {} bytes at offset {}\n'.format(len(bytes_), offset))
写完后刷新文件。您也可以在打开文件时设置len(bytes_)。

python file.write（bytes）有效，但文件缺少字节

1 个答案: