The language of CGO

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Code on the shoulders of giants

C/c++, as the big brother, has accumulated a lot of excellent libraries.The Go language provides CGO tools to support C language function calls, and can also export the C dynamic library from the Go language to other languages.

• How the Go language exports the C language dynamic library

• CGO generally has three forms when using C/C++ resources: directly using source code; linking static library; linking dynamic library

• Compile and link parameters

This is just a brief introduction, if you are interested, you can study it in depth~

1. Call the C language library

Take the classic hello world as an example

package main//#include import "C"func main() {C.puts(C.CString("Hello, World\n"))}

2. Embed C language functions

package main/* #include  void printint(int v) { printf("printint: %d\n", v); } */import "C"func main() {v := 42C.printint(C.int(v))}

package main/* #include  static int div(int a, int b) { if (b==0) { errno = EINVAL; return 0; } return a/b;} */import "C"import "fmt"func main() {v0, err0 := C.div(2,span> 1)fmt.Println(v0, err0)v1, err1 := C.div(2,span> 0)fmt.Println(v1, err1)}