Go で Windows の ini を読む ref: http://qiita.com/zetamatta/items/e86deb7f6587500391c5

getprivateprofilestring.go

package kernel32ini

import (
    "syscall"
    "unsafe"
)

var kernel32 = syscall.NewLazyDLL("kernel32")
var getPrivateProfileString = kernel32.NewProc("GetPrivateProfileStringW")

func GetPrivateProfileString(path, section, keyname, defaultValue string) (string, error) {
    var buffer [2048]uint16

    sec16, secErr := syscall.UTF16PtrFromString(section)
    if secErr != nil {
        return "", secErr
    }
    key16, keyErr := syscall.UTF16PtrFromString(keyname)
    if keyErr != nil {
        return "", keyErr
    }
    default16, defaultErr := syscall.UTF16PtrFromString(defaultValue)
    if defaultErr != nil {
        return "", defaultErr
    }
    path16, pathErr := syscall.UTF16PtrFromString(path)
    if pathErr != nil {
        return "", pathErr
    }
    result, _, err := getPrivateProfileString.Call(
        uintptr(unsafe.Pointer(sec16)),
        uintptr(unsafe.Pointer(key16)),
        uintptr(unsafe.Pointer(default16)),
        uintptr(unsafe.Pointer(&buffer[0])),
        uintptr(len(buffer)),
        uintptr(unsafe.Pointer(path16)))

    if result <= 0 {
        return "", err
    }
    return syscall.UTF16ToString(buffer[0:result]), nil
}

getprivateprofilestring_test.go

package kernel32ini

import (
    "fmt"
    "os"
    "path"
    "testing"
)

const (
    INIPATH = "getprivateprofilestring.ini"
    SECTION = "section1"
    KEY     = "key1"
    DEFAULT = ""
)

func TestGetPrivateProfileString(t *testing.T) {
    wd, err := os.Getwd()
    if err != nil {
        fmt.Println(err.Error())
        t.Fail()
        return
    }
    iniPath := path.Join(wd, INIPATH)
    value, err := GetPrivateProfileString(iniPath, SECTION, KEY, DEFAULT)
    if err != nil {
        fmt.Println(err.Error())
        t.Fail()
        return
    }
    fmt.Printf("%s[%s]%s=%s\n", iniPath, SECTION, KEY, value)
}