golang 和 C 的基本数值类型转换对照表如下：
| C语言类型 | CGO类型 | Go语言类型 |
|---|---|---|
| char | C.char | byte |
| singed char | C.schar | int8 |
| unsigned char | C.uchar | uint8 |
| short | C.short | int16 |
| unsigned short | C.ushort | uint16 |
| int | C.int | int32 |
| unsigned int | C.uint | uint32 |
| long | C.long | int32 |
| unsigned long | C.ulong | uint32 |
| long long int | C.longlong | int64 |
| unsigned long long int | C.ulonglong | uint64 |
| float | C.float | float32 |
| double | C.double | float64 |
| size_t | C.size_t | uint |
参考：
http://litang.me/post/golang-cgo
https://jmalarcon.github.io/markdowntables
https://www.tablesgenerator.com
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