ebiten/internal/uidriver/glfw/hideconsole_windows.go

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// Copyright 2017 The Ebiten Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package glfw
import (
"fmt"
"unsafe"
"golang.org/x/sys/windows"
)
const (
processQueryLimitedInformation = 0x1000
)
var (
kernel32 = windows.NewLazySystemDLL("kernel32.dll")
user32 = windows.NewLazySystemDLL("user32.dll")
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getCurrentProcessIdProc = kernel32.NewProc("GetCurrentProcessId")
getConsoleWindowProc = kernel32.NewProc("GetConsoleWindow")
freeConsoleWindowProc = kernel32.NewProc("FreeConsole")
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getWindowThreadProcessIdProc = user32.NewProc("GetWindowThreadProcessId")
)
func getCurrentProcessId() (uint32, error) {
r, _, e := getCurrentProcessIdProc.Call()
if e != nil && e.(windows.Errno) != 0 {
return 0, fmt.Errorf("ui: GetCurrentProcessId failed: %d", e)
}
return uint32(r), nil
}
func getWindowThreadProcessId(hwnd uintptr) (uint32, error) {
pid := uint32(0)
r, _, e := getWindowThreadProcessIdProc.Call(hwnd, uintptr(unsafe.Pointer(&pid)))
if r == 0 {
return 0, fmt.Errorf("ui: GetWindowThreadProcessId failed: %d", e)
}
return pid, nil
}
func getConsoleWindow() (uintptr, error) {
r, _, e := getConsoleWindowProc.Call()
if e != nil && e.(windows.Errno) != 0 {
return 0, fmt.Errorf("ui: GetConsoleWindow failed: %d", e)
}
return r, nil
}
func freeConsole() error {
_, _, e := freeConsoleWindowProc.Call()
if e != nil && e.(windows.Errno) != 0 {
return fmt.Errorf("ui: FreeConsole failed: %d", e)
}
return nil
}
// hideConsoleWindowOnWindows will hide the console window that is showing when
// compiling on Windows without specifying the '-ldflags "-Hwindowsgui"' flag.
func hideConsoleWindowOnWindows() {
pid, err := getCurrentProcessId()
if err != nil {
// Ignore errors because:
// 1. It is not critical if the console can't be hid.
// 2. There is nothing to do when errors happen.
return
}
w, err := getConsoleWindow()
if err != nil {
// Ignore errors
return
}
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// Get the process ID of the console's creator.
cpid, err := getWindowThreadProcessId(w)
if err != nil {
// Ignore errors
return
}
if pid == cpid {
// The current process created its own console. Hide this.
// Ignore error
freeConsole()
}
}