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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [exp/] [wingui/] [gui.go] - Blame information for rev 747

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Line No. Rev Author Line
1 747 jeremybenn 
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build windows
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package main
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import (
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        "fmt"
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        "os"
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        "syscall"
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        "unsafe"
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)
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// some help functions
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func abortf(format string, a ...interface{}) {
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        fmt.Fprintf(os.Stdout, format, a...)
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        os.Exit(1)
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}
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func abortErrNo(funcname string, err error) {
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        errno, _ := err.(syscall.Errno)
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        abortf("%s failed: %d %s\n", funcname, uint32(errno), err)
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}
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// global vars
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var (
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        mh syscall.Handle
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        bh syscall.Handle
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)
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// WinProc called by windows to notify us of all windows events we might be interested in.
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func WndProc(hwnd syscall.Handle, msg uint32, wparam, lparam uintptr) (rc uintptr) {
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        switch msg {
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        case WM_CREATE:
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                var e error
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                // CreateWindowEx
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                bh, e = CreateWindowEx(
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                        0,
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                        syscall.StringToUTF16Ptr("button"),
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                        syscall.StringToUTF16Ptr("Quit"),
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                        WS_CHILD|WS_VISIBLE|BS_DEFPUSHBUTTON,
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                        75, 70, 140, 25,
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                        hwnd, 1, mh, 0)
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                if e != nil {
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                        abortErrNo("CreateWindowEx", e)
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                }
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                fmt.Printf("button handle is %x\n", bh)
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                rc = DefWindowProc(hwnd, msg, wparam, lparam)
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        case WM_COMMAND:
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                switch syscall.Handle(lparam) {
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                case bh:
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                        e := PostMessage(hwnd, WM_CLOSE, 0, 0)
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                        if e != nil {
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                                abortErrNo("PostMessage", e)
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                        }
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                default:
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                        rc = DefWindowProc(hwnd, msg, wparam, lparam)
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                }
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        case WM_CLOSE:
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                DestroyWindow(hwnd)
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        case WM_DESTROY:
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                PostQuitMessage(0)
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        default:
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                rc = DefWindowProc(hwnd, msg, wparam, lparam)
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        }
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        //fmt.Printf("WndProc(0x%08x, %d, 0x%08x, 0x%08x) (%d)\n", hwnd, msg, wparam, lparam, rc)
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        return
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}
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func rungui() int {
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        var e error
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        // GetModuleHandle
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        mh, e = GetModuleHandle(nil)
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        if e != nil {
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                abortErrNo("GetModuleHandle", e)
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        }
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        // Get icon we're going to use.
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        myicon, e := LoadIcon(0, IDI_APPLICATION)
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        if e != nil {
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                abortErrNo("LoadIcon", e)
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        }
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        // Get cursor we're going to use.
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        mycursor, e := LoadCursor(0, IDC_ARROW)
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        if e != nil {
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                abortErrNo("LoadCursor", e)
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        }
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        // Create callback
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        wproc := syscall.NewCallback(WndProc)
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        // RegisterClassEx
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        wcname := syscall.StringToUTF16Ptr("myWindowClass")
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        var wc Wndclassex
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        wc.Size = uint32(unsafe.Sizeof(wc))
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        wc.WndProc = wproc
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        wc.Instance = mh
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        wc.Icon = myicon
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        wc.Cursor = mycursor
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        wc.Background = COLOR_BTNFACE + 1
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        wc.MenuName = nil
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        wc.ClassName = wcname
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        wc.IconSm = myicon
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        if _, e := RegisterClassEx(&wc); e != nil {
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                abortErrNo("RegisterClassEx", e)
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        }
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        // CreateWindowEx
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        wh, e := CreateWindowEx(
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                WS_EX_CLIENTEDGE,
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                wcname,
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                syscall.StringToUTF16Ptr("My window"),
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                WS_OVERLAPPEDWINDOW,
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                CW_USEDEFAULT, CW_USEDEFAULT, 300, 200,
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                0, 0, mh, 0)
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        if e != nil {
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                abortErrNo("CreateWindowEx", e)
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        }
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        fmt.Printf("main window handle is %x\n", wh)
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        // ShowWindow
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        ShowWindow(wh, SW_SHOWDEFAULT)
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        // UpdateWindow
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        if e := UpdateWindow(wh); e != nil {
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                abortErrNo("UpdateWindow", e)
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        }
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        // Process all windows messages until WM_QUIT.
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        var m Msg
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        for {
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                r, e := GetMessage(&m, 0, 0, 0)
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                if e != nil {
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                        abortErrNo("GetMessage", e)
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                }
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                if r == 0 {
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                        // WM_QUIT received -> get out
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                        break
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                }
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                TranslateMessage(&m)
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                DispatchMessage(&m)
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        }
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        return int(m.Wparam)
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}
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func main() {
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        rc := rungui()
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        os.Exit(rc)
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}

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