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84e53d4c61
The returned errors from syscall.Syscall* and windows.LazyProc.Call come from GetLastError. The value of GetLastError is not reliable when the function succeeds. This change fixes the usages of error values. The error value is now used only when the API explicitly fails.
77 lines
2.2 KiB
Go
77 lines
2.2 KiB
Go
// Copyright 2017 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package glfw
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import (
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"fmt"
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"unsafe"
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"golang.org/x/sys/windows"
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)
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const (
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processQueryLimitedInformation = 0x1000
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)
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var (
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kernel32 = windows.NewLazySystemDLL("kernel32.dll")
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user32 = windows.NewLazySystemDLL("user32.dll")
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procFreeConsoleWindow = kernel32.NewProc("FreeConsole")
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procGetCurrentProcessId = kernel32.NewProc("GetCurrentProcessId")
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procGetConsoleWindow = kernel32.NewProc("GetConsoleWindow")
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procGetWindowThreadProcessId = user32.NewProc("GetWindowThreadProcessId")
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)
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func freeConsole() error {
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r, _, e := procFreeConsoleWindow.Call()
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if r == 0 {
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if e != nil && e != windows.ERROR_SUCCESS {
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return fmt.Errorf("glfw: FreeConsole failed: %w", e)
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}
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return fmt.Errorf("glfw: FreeConsole returned 0")
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}
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return nil
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}
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func getCurrentProcessId() uint32 {
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r, _, _ := procGetCurrentProcessId.Call()
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return uint32(r)
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}
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func getConsoleWindow() windows.HWND {
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r, _, _ := procGetConsoleWindow.Call()
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return windows.HWND(r)
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}
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func getWindowThreadProcessId(hwnd windows.HWND) (tid, pid uint32) {
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r, _, _ := procGetWindowThreadProcessId.Call(uintptr(hwnd), uintptr(unsafe.Pointer(&pid)))
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tid = uint32(r)
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return
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}
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// hideConsoleWindowOnWindows will hide the console window that is showing when
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// compiling on Windows without specifying the '-ldflags "-Hwindowsgui"' flag.
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func hideConsoleWindowOnWindows() {
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pid := getCurrentProcessId()
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// Get the process ID of the console's creator.
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_, cpid := getWindowThreadProcessId(getConsoleWindow())
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if pid == cpid {
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// The current process created its own console. Hide this.
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// Ignore error.
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freeConsole()
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}
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}
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