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// 7 february 2014
package main
import (
"fmt"
"os"
"runtime"
)
func fatalf(format string, args ...interface{}) {
s := fmt.Sprintf(format, args...)
_, err := MessageBox(NULL,
"An internal error has occured:\n" + s,
os.Args[0],
MB_OK | MB_ICONERROR)
if err == nil {
os.Exit(1)
}
panic(fmt.Sprintf("error trying to warn user of internal error: %v\ninternal error:\n%s", err, s))
}
const (
IDC_BUTTON = 100
IDC_VARCOMBO = 101
IDC_FIXCOMBO = 102
)
var varCombo, fixCombo HWND
func wndProc(hwnd HWND, msg uint32, wParam WPARAM, lParam LPARAM) LRESULT {
switch msg {
case WM_COMMAND:
if wParam.LOWORD() == IDC_BUTTON {
buttonclick := "neither clicked nor double clicked (somehow)"
if wParam.HIWORD() == BN_CLICKED {
buttonclick = "clicked"
} else if wParam.HIWORD() == BN_DOUBLECLICKED {
buttonclick = "double clicked"
}
varText, err := getText(varCombo)
if err != nil {
fatalf("error getting variable combo box text: %v", err)
}
fixTextWM, err := getText(fixCombo)
if err != nil {
fatalf("error getting fixed combo box text with WM_GETTEXT: %v", err)
}
fixTextIndex, err := SendMessage(fixCombo, CB_GETCURSEL, 0, 0)
if err != nil {
fatalf("error getting fixed combo box current selection: %v", err)
}
// TODO get text from index
MessageBox(hwnd,
fmt.Sprintf("button state: %s\n" +
"variable combo box text: %s\n" +
"fixed combo box text with WM_GETTEXT: %s\n" +
"fixed combo box current index: %d\n",
buttonclick, varText, fixTextWM, fixTextIndex),
"note",
MB_OK)
}
return 0
case WM_CLOSE:
err := DestroyWindow(hwnd)
if err != nil {
fatalf("error destroying window: %v", err)
}
return 0
case WM_DESTROY:
err := PostQuitMessage(0)
if err != nil {
fatalf("error posting quit message: %v", err)
}
return 0
default:
return DefWindowProc(hwnd, msg, wParam, lParam)
}
fatalf("major bug: forgot a return on wndProc for message %d", msg)
panic("unreachable")
}
const className = "mainwin"
func main() {
runtime.LockOSThread()
hInstance, err := getWinMainhInstance()
if err != nil {
fatalf("error getting WinMain hInstance: %v", err)
}
nCmdShow, err := getWinMainnCmdShow()
if err != nil {
fatalf("error getting WinMain nCmdShow: %v", err)
}
icon, err := LoadIcon_ResourceID(NULL, IDI_APPLICATION)
if err != nil {
fatalf("error getting window icon: %v", err)
}
cursor, err := LoadCursor_ResourceID(NULL, IDC_ARROW)
if err != nil {
fatalf("error getting window cursor: %v", err)
}
wc := &WNDCLASS{
LpszClassName: className,
LpfnWndProc: wndProc,
HInstance: hInstance,
HIcon: icon,
HCursor: cursor,
HbrBackground: HBRUSH(COLOR_WINDOW + 1),
}
_, err = RegisterClass(wc)
if err != nil {
fatalf("error registering window class: %v", err)
}
hwnd, err := CreateWindowEx(
WS_EX_OVERLAPPEDWINDOW,
className, "Main Window",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, 320, 240,
NULL, NULL, hInstance, NULL)
if err != nil {
fatalf("error creating window: %v", err)
}
_, err = CreateWindowEx(
0,
"BUTTON", "Click Me",
BS_PUSHBUTTON | WS_CHILD | WS_VISIBLE | WS_TABSTOP,
20, 20, 100, 20,
hwnd, HMENU(IDC_BUTTON), hInstance, NULL)
if err != nil {
fatalf("error creating button: %v", err)
}
varCombo, err = CreateWindowEx(
0,
"COMBOBOX", "",
CBS_DROPDOWN | CBS_AUTOHSCROLL | WS_CHILD | WS_VISIBLE | WS_TABSTOP,
140, 20, 100, 20,
hwnd, HMENU(IDC_VARCOMBO), hInstance, NULL)
if err != nil {
fatalf("error creating variable combo box: %v", err)
}
vcItems := []string{"a", "b", "c", "d"}
for _, v := range vcItems {
_, err := SendMessage(varCombo, CB_ADDSTRING, 0,
LPARAMFromString(v))
if err != nil {
fatalf("error adding %q to variable combo box: %v", v, err)
}
}
fixCombo, err = CreateWindowEx(
0,
"COMBOBOX", "",
CBS_DROPDOWNLIST | WS_CHILD | WS_VISIBLE | WS_TABSTOP,
140, 50, 100, 20,
hwnd, HMENU(IDC_FIXCOMBO), hInstance, NULL)
if err != nil {
fatalf("error creating fixed combo box: %v", err)
}
fcItems := []string{"e", "f", "g", "h"}
for _, v := range fcItems {
_, err := SendMessage(fixCombo, CB_ADDSTRING, 0,
LPARAMFromString(v))
if err != nil {
fatalf("error adding %q to fixed combo box: %v", v, err)
}
}
_, err = ShowWindow(hwnd, nCmdShow)
if err != nil {
fatalf("error showing window: %v", err)
}
err = UpdateWindow(hwnd)
if err != nil {
fatalf("error updating window: %v", err)
}
for {
msg, done, err := GetMessage(NULL, 0, 0)
if err != nil {
fatalf("error getting message: %v", err)
}
if done {
break
}
_, err = TranslateMessage(msg)
if err != nil {
fatalf("error translating message: %v", err)
}
_, err = DispatchMessage(msg)
if err != nil {
fatalf("error dispatching message: %v", err)
}
}
}
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