- 1 year ago
Creating C DLL and using it in Golang?
To create a C DLL and use it in Golang, you need to follow a few steps:
Write the C Code and Compile it as a DLL:
Write the C code for the functionality you want to expose as a DLL. Make sure to include the appropriate header files and function signatures. Then, compile the C code into a dynamic-link library (DLL) using a C compiler. The process of creating a DLL may vary depending on your operating system and compiler.Create a C Wrapper:
To interact with the C DLL from Golang, you'll need to create a C wrapper that exports functions from the DLL using the C calling convention. This wrapper will act as a bridge between the Golang code and the C DLL.Write Golang Code:
In Golang, you can use thecgo
tool to interact with C code. Write the Golang code that imports the C functions using the C wrapper. You can use the//#cgo
directive to specify the C compiler options and import the C functions using theimport "C"
statement.Build the Golang Program:
Use thego build
command to build the Golang program that includes the C wrapper and uses the C DLL.
Here's a step-by-step example of how to create a simple C DLL and use it in Golang:
- Create the C Code and Compile it as a DLL:
Let's assume you have a C code file namedmylib.c
:
c// mylib.c
#include <stdio.h>
int add(int a, int b) {
return a + b;
}
To compile the C code as a DLL, you can use the following commands:
bash# On Windows (with MinGW)
gcc -shared -o mylib.dll mylib.c
# On Linux
gcc -shared -o mylib.so mylib.c
- Create a C Wrapper:
Create a header file namedmylib_wrapper.h
that includes the function signature from the C code:
c// mylib_wrapper.h
#ifndef MYLIB_WRAPPER_H
#define MYLIB_WRAPPER_H
int add(int a, int b);
#endif
- Write Golang Code:
Create a Golang file namedmain.go
:
gopackage main
//#cgo CFLAGS: -I.
//#cgo LDFLAGS: -L. -lmylib
//#include "mylib_wrapper.h"
import "C"
import "fmt"
func main() {
a, b := 5, 10
result := C.add(C.int(a), C.int(b))
fmt.Printf("%d + %d = %d\n", a, b, int(result))
}
- Build the Golang Program:
Use the following command to build the Golang program:
bashgo build
Now, you should have an executable file (e.g., main
on Linux or main.exe
on Windows) that uses the C DLL.
Please note that this is a simple example to demonstrate the basic steps of using a C DLL in Golang. In a real-world scenario, you might have more complex C functions and data structures to interact with. Additionally, be cautious when working with C code and pointers to avoid memory issues.