## 定义 `File` 与 `Form` 参数 { #define-file-and-form-parameters }

创建文件和表单参数的方式与 `Body` 和 `Query` 一样：

{* ../../docs_src/request_forms_and_files/tutorial001_an_py310.py hl[10:12] *}

文件和表单字段作为表单数据上传与接收。

并且你可以将部分文件声明为 `bytes`，将部分文件声明为 `UploadFile`。

/// warning | 警告

可在一个*路径操作*中声明多个 `File` 与 `Form` 参数，但不能同时声明要接收 JSON 的 `Body` 字段。因为此时请求体的编码为 `multipart/form-data`，不是 `application/json`。

这不是 **FastAPI** 的问题，而是 HTTP 协议的规定。

///

        assertNotNull(lockResponse);
    }

    @Nested
    @DisplayName("writeBytesWireFormat tests")
    class WriteBytesWireFormatTests {

        @Test
        @DisplayName("Should always return 0 for write bytes")
        void testWriteBytesWireFormat() {
            // Given
            byte[] dst = new byte[100];
            int dstIndex = 0;

            // When

			bts, err = msgp.Skip(bts)
			if err != nil {
				err = msgp.WrapError(err)
				return
			}
		}
	}
	o = bts
	return
}

// Msgsize returns an upper bound estimate of the number of bytes occupied by the serialized message
func (z *BucketReplicationStat) Msgsize() (s int) {

SuccessExitStatus=143

# Specifies the maximum file descriptor number that can be opened by this process
LimitNOFILE=${packaging.os.max.open.files}

# Specifies the maximum number of bytes of memory that may be locked into RAM
# Set to "infinity" if you use the 'bootstrap.mlockall: true' option
# in fess.yml and 'MAX_LOCKED_MEMORY=unlimited' in ${packaging.env.file}
#LimitMEMLOCK=infinity

   * reading, such as an {@code InputStream}. Unlike with writable resources, there's no chance that
   * a failure that occurs when closing the stream indicates a meaningful problem such as a failure
   * to flush all bytes to the underlying resource.
   *
   * @param inputStream the input stream to be closed, or {@code null} in which case this method
   *     does nothing
   * @since 17.0
   */

		NodeCount:             numNodes,
	}
	go m.trackEWMA()
	return m
}

func (m *Monitor) updateMeasurement(opts BucketOptions, bytes uint64) {
	m.mlock.Lock()
	defer m.mlock.Unlock()

	tm, ok := m.bucketsMeasurement[opts]
	if !ok {
		tm = &bucketMeasurement{}
	}
	tm.incrementBytes(bytes)
	m.bucketsMeasurement[opts] = tm
}

// SelectionFunction for buckets
type SelectionFunction func(bucket string) bool

        void testInheritance() {
            assertTrue(echoResponse instanceof ServerMessageBlock2Response);
        }
    }

    @Nested
    @DisplayName("Write Bytes Wire Format Tests")
    class WriteBytesWireFormatTests {

        @Test
        @DisplayName("Should return 0 for writeBytesWireFormat")
        void testWriteBytesWireFormat() {

	//
	// Note: The size of the security token that STS APIs return is not fixed. We
	// strongly recommend that you make no assumptions about the maximum size. As
	// of this writing, the typical size is less than 4096 bytes, but that can vary.
	// Also, future updates to AWS might require larger sizes.
	Credentials auth.Credentials `xml:",omitempty"`

	// A percentage value that indicates the size of the policy in packed form.

                    lo,
                    (int) c,
                    (int) result))
            .that(result)
            .isEqualTo(c);

        byte[] bytes = Chars.toByteArray(c);
        assertThat(bytes[0]).isEqualTo((byte) hi);
        assertThat(bytes[1]).isEqualTo((byte) lo);

        c++;
      }
    }
    assertThat(c).isEqualTo((char) 0); // sanity check
  }

{* ../../docs_src/request_forms_and_files/tutorial001_an_py310.py hl[10:12] *}

Dosyalar ve form alanları form data olarak upload edilir ve siz de dosyaları ve form alanlarını alırsınız.

Ayrıca bazı dosyaları `bytes` olarak, bazılarını da `UploadFile` olarak tanımlayabilirsiniz.

/// warning | Uyarı