How to call c code in golang

#cgo makes it possible to use C code in Golang.

##Hello World                                                                                                                              A simple example, create the file main.go:

package main
/*
#include <stdio.h>

void sayHi() {
    printf("Hi");
}
*/
import "C"
 
func main() {
    C.sayHi()
}

Execute the program:

go run main.go

The program executes and outputs hi (for more examples, see $GOROOT/misc/ cgo).

Preparation work under Windows

If you want to use cgo on Windows, you need to install the gcc compiler. Here I use mingw-w64.

Set compilation and link flags

What we use import "C" to import is a pseudo-package (pseudo-package), through which we use C code. Before import "C", the comment immediately following import "C" can include:

编译器和链接器标志
C 代码

We can set the compiler and linker flags through the #cgo directive, for example:

// #cgo CFLAGS: -DPNG_DEBUG=1
// #cgo amd64 386 CFLAGS: -DX86=1
// #cgo LDFLAGS: -lpng
// #include <png.h>
import "C"

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