英文:
Why can't we make a good comparison? ruby-ffi call golang(so files)
问题
我正在使用ruby-ffi调用由Golang创建的共享文件。
然而，当我单独运行Golang时，进程可以正常工作，但是当我通过ruby-ffi运行它时，比较就无法正常工作。
以下是一个可能出错的示例。
首先，创建一个go build并加载它。
go build -buildmode=c-shared -o replace.so replace.go
module Sampleextend FFI::Libraryffi_lib 'replace.so'attach_function :zen_roma_to_han_roma, [:string], :stringend
[5] pry(main)> Sample.zen_roma_to_han_roma("test")=> "test"
我不知道这个问题的原因，我需要你的帮助。
还有其他什么我应该尝试的吗？
英文:
I'm calling shared files created by Golang from ruby-ffi.
However, when I run Golang alone, the process works, but when I run it via ruby-ffi, the comparison doesn't work.
package mainimport ("C""fmt")//export zen_roma_to_han_romafunc zen_roma_to_han_roma(s string) string {if s=="test" {return "10"}return s}func main(){fmt.Println(zen_roma_to_han_roma("test"))}
$ go run replace.go10
Here's an example of what can go wrong.
First, create a go build and load it.
go build -buildmode=c-shared -o replace.so replace.go
module Sampleextend FFI::Libraryffi_lib 'replace.so'attach_function :zen_roma_to_han_roma, [:string], :stringend
[5] pry(main)> Sample.zen_roma_to_han_roma("test")=> "test
I don't know the cause of this and I need your help.
Is there anything else I should try?
答案1
得分: 1
我不是Golang程序员，但是这是来自FFI gem文档的一句引用：
> :string 应该被视为 const char *，只要库在访问期间不改变Ruby字符串。如果要从C或Ruby端修改字符串缓冲区，请使用 :pointer 和 FFI::MemoryPointer。
因此，你应该将 *C.char 作为参数传递，并返回相同类型的值，而不是 string。
package mainimport ("C""fmt")//export zen_roma_to_han_romafunc zen_roma_to_han_roma(s *C.char) *C.char {test_string := C.GoString(s)if test_string == "test" {return C.CString("10")}return s}func main() {fmt.Println(C.GoString(zen_roma_to_han_roma(C.CString("test"))))}
英文:
I am not a Golang programmer but still here is a quote from the FFI gem documentation
> :string should be considered to be const char * and the Ruby string must not be changed as long as it’s accessed by the library. If the string buffer shall be modified from C or Ruby side, use :pointer and FFI::MemoryPointer instead.
So you should pass *C.char as an argument and return a value of the same type instead of string.
package mainimport ("C""fmt")//export zen_roma_to_han_romafunc zen_roma_to_han_roma(s *C.char) *C.char {test_string := C.GoString(s)if test_string == "test" {return C.CString("10")}return s}func main() {fmt.Println(C.GoString(zen_roma_to_han_roma(C.CString("test"))))}
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