151 lines
4.4 KiB
Go
151 lines
4.4 KiB
Go
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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. "github.com/llgcode/draw2d/wingui"
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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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_ = make([]int, 100000)
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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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