应用笔记 · 2023年10月5日

protobuf 3 基本数据类型及与C/C#/Java/Python/Ruby/Go/PHP/Dart等语言数据类型的对应关系

.proto Type Notes C++ Type Java/Kotlin Type[1] Python Type[3] Go Type Ruby Type C# Type PHP Type Dart Type
double double double float float64 Float double float double
float float float float float32 Float float float double
int32 Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint32 instead. int32 int int int32 Fixnum or Bignum (as required) int integer int
int64 Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint64 instead. int64 long int/long[4] int64 Bignum long integer/string[6] Int64
uint32 Uses variable-length encoding. uint32 int[2] int/long[4] uint32 Fixnum or Bignum (as required) uint integer int
uint64 Uses variable-length encoding. uint64 long[2] int/long[4] uint64 Bignum ulong integer/string[6] Int64
sint32 Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int32s. int32 int int int32 Fixnum or Bignum (as required) int integer int
sint64 Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int64s. int64 long int/long[4] int64 Bignum long integer/string[6] Int64
fixed32 Always four bytes. More efficient than uint32 if values are often greater than 228. uint32 int[2] int/long[4] uint32 Fixnum or Bignum (as required) uint integer int
fixed64 Always eight bytes. More efficient than uint64 if values are often greater than 256. uint64 long[2] int/long[4] uint64 Bignum ulong integer/string[6] Int64
sfixed32 Always four bytes. int32 int int int32 Fixnum or Bignum (as required) int integer int
sfixed64 Always eight bytes. int64 long int/long[4] int64 Bignum long integer/string[6] Int64
bool bool boolean bool bool TrueClass/FalseClass bool boolean bool
string A string must always contain UTF-8 encoded or 7-bit ASCII text, and cannot be longer than 232. string String str/unicode[5] string String (UTF-8) string string String
bytes May contain any arbitrary sequence of bytes no longer than 232. string ByteString str (Python 2)
bytes (Python 3)		 []byte String (ASCII-8BIT) ByteString string List

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