调用Windows函数（获取字体目录）

Question

I try to find out the font folder on a windows installation. AFAICS the proposed way is to call SHGetKnownFolderPath in Shell32.dll with KNOWNFOLDERID set to FOLDERID_Fonts.

I have no idea what to pass to the Call function in the code below:

package main

import (
    "syscall"
)

func main() {
    // HRESULT SHGetKnownFolderPath(
    //   _In_      REFKNOWNFOLDERID rfid,
    //   _In_      DWORD dwFlags,
    //   _In_opt_  HANDLE hToken,
    //   _Out_     PWSTR *ppszPath
    // );

    var (
        shell32             = syscall.NewLazyDLL("Shell32.dll")
        shGetKnowFolderPath = shell32.NewProc("SHGetKnownFolderPath")

        // Doesn't work, of course:
        folderId int
        flags    int
        handle   int
        retval   int
    )

    shGetKnowFolderPath.Call(uintptr(folderId), uintptr(flags), uintptr(handle), uintptr(retval))
}

Any idea? (I guess a workaround for now would be to stick to %windir%\Fonts, but I'd like to get a proper solution).

References:

• http://msdn.microsoft.com/en-us/library/windows/desktop/bb762181(v=vs.85).aspx
• http://msdn.microsoft.com/en-us/library/windows/desktop/dd378457(v=vs.85).aspx

Answer 1

golang.org/x/sys/windows now has a wrapper for SHGetKnownFolderPath, so this is much easier:

package main

import (
    "fmt"

    "golang.org/x/sys/windows"
)

func main() {
    path, err := windows.KnownFolderPath(windows.FOLDERID_Fonts, 0)
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Println(path)
}