[Golang-C]go和c的基本类型转换

类型

char --> C.char --> byte
signed char --> C.schar --> int8
unsigned char --> C.uchar --> uint8
short int --> C.short --> int16
short unsigned int --> C.ushort --> uint16
int --> C.int --> int
unsigned int --> C.uint --> uint32
long int --> C.long --> int32 or int64
long unsigned int --> C.ulong --> uint32 or uint64
long long int --> C.longlong --> int64
long long unsigned int --> C.ulonglong --> uint64
float --> C.float --> float32
double --> C.double --> float64
wchar_t --> C.wchar_t --> 
void * -> unsafe.Pointer

转换

package main
/*
#include <stdio.h>
#include <stdlib.h>
char ch = 'M';
unsigned char uch = 253;
short st = 233;
int i = 257;
long lt = 11112222;
float f = 3.14;
double db = 3.15;
void * p;
char *str = "const string";
char str1[64] = "char array";
void printI(void *i)
{
 printf("print i = %d\n", (*(int *)i));
}
struct ImgInfo {
 char *imgPath;
 int format;
 unsigned int width;
 unsigned int height;
};
void printStruct(struct ImgInfo *imgInfo)
{
 if(!imgInfo) {
 fprintf(stderr, "imgInfo is null\n");
 return ;
 }
 fprintf(stdout, "imgPath = %s\n", imgInfo->imgPath);
 fprintf(stdout, "format = %d\n", imgInfo->format);
 fprintf(stdout, "width = %d\n", imgInfo->width);
}
*/
import "C"
import (
 "fmt"
 "reflect"
 "unsafe"
)
func main() {
 fmt.Println("----------------Go to C---------------")
 fmt.Println(C.char('Y'))
 fmt.Printf("%c\n", C.char('Y'))
 fmt.Println(C.uchar('C'))
 fmt.Println(C.short(254))
 fmt.Println(C.long(11112222))
 var goi int = 2
 // unsafe.Pointer --> void *
 cpi := unsafe.Pointer(&goi)
 C.printI(cpi)
 fmt.Println("----------------C to Go---------------")
 fmt.Println(C.ch)
 fmt.Println(C.uch)
 fmt.Println(C.st)
 fmt.Println(C.i)
 fmt.Println(C.lt)
 f := float32(C.f)
 fmt.Println(reflect.TypeOf(f))
 fmt.Println(C.f)
 db := float64(C.db)
 fmt.Println(reflect.TypeOf(db))
 fmt.Println(C.db)
 // 区别常量字符串和char数组,转换成Go类型不一样
 str := C.GoString(C.str)
 fmt.Println(str)
 fmt.Println(reflect.TypeOf(C.str1))
 var charray []byte
 for i := range C.str1 {
 if C.str1[i] != 0 {
 charray = append(charray, byte(C.str1[i]))
 }
 }
 fmt.Println(charray)
 fmt.Println(string(charray))
 for i := 0; i < 10; i++ {
 imgInfo := C.struct_ImgInfo{imgPath: C.CString("../images/xx.jpg"), format: 0, width: 500, height: 400}
 defer C.free(unsafe.Pointer(imgInfo.imgPath))
 C.printStruct(&imgInfo)
 }
 fmt.Println("----------------C Print----------------")
}

输出结果

----------------Go to C---------------
89
Y
67
254
11112222
----------------C to Go---------------
77
253
233
257
11112222
float32
3.14
float64
3.15
const string
[64]main._Ctype_char
[99 104 97 114 32 97 114 114 97 121]
char array
----------------C Print----------------
print i = 2
imgPath = ../images/xx.jpg
format = 0
width = 500
imgPath = ../images/xx.jpg
format = 0
width = 500
imgPath = ../images/xx.jpg
format = 0
width = 500
imgPath = ../images/xx.jpg
format = 0
width = 500

本文来自:简书

感谢作者:_小老虎_

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