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windows: add Get*PreferredUILanguages

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This commit adds the following MUI functions:
- GetUserPreferredUILanguages
- GetSystemPreferredUILanguages
- GetThreadPreferredUILanguages
- GetProcessPreferredUILanguages

Change-Id: I44f1c07245ab814935778c6b910b224d24cc753c
Reviewed-on: https://go-review.googlesource.com/c/sys/+/207860
Reviewed-by: Simon Rozman <simon@rozman.si>
Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Simon Rozman
2019-11-20 13:05:36 +00:00
committed by Jason A. Donenfeld
parent f068ffe820
commit 6bfc516c86
4 changed files with 167 additions and 0 deletions
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windows/syscall_windows.go
+55
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@@ -313,6 +313,10 @@ func NewCallbackCDecl(fn interface{}) uintptr {
//sys CoTaskMemFree(address unsafe.Pointer) = ole32.CoTaskMemFree
//sys rtlGetVersion(info *OsVersionInfoEx) (ret error) = ntdll.RtlGetVersion
//sys rtlGetNtVersionNumbers(majorVersion *uint32, minorVersion *uint32, buildNumber *uint32) = ntdll.RtlGetNtVersionNumbers
//sys getProcessPreferredUILanguages(flags uint32, numLanguages *uint32, buf *uint16, bufSize *uint32) (err error) = kernel32.GetProcessPreferredUILanguages
//sys getThreadPreferredUILanguages(flags uint32, numLanguages *uint32, buf *uint16, bufSize *uint32) (err error) = kernel32.GetThreadPreferredUILanguages
//sys getUserPreferredUILanguages(flags uint32, numLanguages *uint32, buf *uint16, bufSize *uint32) (err error) = kernel32.GetUserPreferredUILanguages
//sys getSystemPreferredUILanguages(flags uint32, numLanguages *uint32, buf *uint16, bufSize *uint32) (err error) = kernel32.GetSystemPreferredUILanguages
// Process Status API (PSAPI)
//sys EnumProcesses(processIds []uint32, bytesReturned *uint32) (err error) = psapi.EnumProcesses
@@ -1378,3 +1382,54 @@ func RtlGetNtVersionNumbers() (majorVersion, minorVersion, buildNumber uint32) {
buildNumber &= 0xffff
return
}
// GetProcessPreferredUILanguages retrieves the process preferred UI languages.
func GetProcessPreferredUILanguages(flags uint32) ([]string, error) {
return getUILanguages(flags, getProcessPreferredUILanguages)
}
// GetThreadPreferredUILanguages retrieves the thread preferred UI languages for the current thread.
func GetThreadPreferredUILanguages(flags uint32) ([]string, error) {
return getUILanguages(flags, getThreadPreferredUILanguages)
}
// GetUserPreferredUILanguages retrieves information about the user preferred UI languages.
func GetUserPreferredUILanguages(flags uint32) ([]string, error) {
return getUILanguages(flags, getUserPreferredUILanguages)
}
// GetSystemPreferredUILanguages retrieves the system preferred UI languages.
func GetSystemPreferredUILanguages(flags uint32) ([]string, error) {
return getUILanguages(flags, getSystemPreferredUILanguages)
}
func getUILanguages(flags uint32, f func(flags uint32, numLanguages *uint32, buf *uint16, bufSize *uint32) error) ([]string, error) {
size := uint32(128)
for {
var numLanguages uint32
buf := make([]uint16, size)
err := f(flags, &numLanguages, &buf[0], &size)
if err == ERROR_INSUFFICIENT_BUFFER {
continue
}
if err != nil {
return nil, err
}
buf = buf[:size]
if numLanguages == 0 || len(buf) == 0 { // GetProcessPreferredUILanguages may return numLanguages==0 with "\0\0"
return []string{}, nil
}
if buf[len(buf)-1] == 0 {
buf = buf[:len(buf)-1] // remove terminating null
}
languages := make([]string, 0, numLanguages)
from := 0
for i, c := range buf {
if c == 0 {
languages = append(languages, string(utf16.Decode(buf[from:i])))
from = i + 1
}
}
return languages, nil
}
}