From 35e8a028f5d5f9654d7fa34ebadf26cfef845759 Mon Sep 17 00:00:00 2001
From: Pietro Gagliardi <pietro10@mac.com>
Date: Fri, 7 Feb 2014 21:17:24 -0500
Subject: [PATCH] Initial commit. Added MessageBox() code.

---
 common.go     | 17 +++++++++++
 main.go       | 12 ++++++++
 messagebox.go | 85 +++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 114 insertions(+)
 create mode 100644 common.go
 create mode 100644 main.go
 create mode 100644 messagebox.go

diff --git a/common.go b/common.go
new file mode 100644
index 0000000..8b4daa5
--- /dev/null
+++ b/common.go
@@ -0,0 +1,17 @@
+// 7 february 2014
+package main
+
+import (
+	"syscall"
+)
+
+var (
+	user32 = syscall.NewLazyDLL("user32.dll")
+)
+
+type HWND uintptr
+
+const (
+	NULL = 0
+)
+
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..c8162ef
--- /dev/null
+++ b/main.go
@@ -0,0 +1,12 @@
+// 7 february 2014
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println(MessageBox(NULL,
+		"hello, world",
+		"hello",
+		0))
+}
+
diff --git a/messagebox.go b/messagebox.go
new file mode 100644
index 0000000..ba50f61
--- /dev/null
+++ b/messagebox.go
@@ -0,0 +1,85 @@
+// 7 february 2014
+package main
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// MessageBox button types.
+const (
+	MB_ABORTRETRYIGNORE = 0x00000002
+	MB_CANCELTRYCONTINUE = 0x00000006
+	MB_HELP = 0x00004000
+	MB_OK = 0x00000000
+	MB_OKCANCEL = 0x00000001
+	MB_RETRYCANCEL = 0x00000005
+	MB_YESNO = 0x00000004
+	MB_YESNOCANCEL = 0x00000003
+)
+
+// MessageBox icon types.
+const (
+	MB_ICONEXCLAMATION = 0x00000030
+	MB_ICONWARNING = 0x00000030
+	MB_ICONINFORMATION = 0x00000040
+	MB_ICONASTERISK = 0x00000040
+	MB_ICONQUESTION = 0x00000020
+	MB_ICONSTOP = 0x00000010
+	MB_ICONERROR = 0x00000010
+	MB_ICONHAND = 0x00000010
+)
+
+// MessageBox default button types.
+const (
+	MB_DEFBUTTON1 = 0x00000000
+	MB_DEFBUTTON2 = 0x00000100
+	MB_DEFBUTTON3 = 0x00000200
+	MB_DEFBUTTON4 = 0x00000300
+)
+
+// MessageBox modality types.
+const (
+	MB_APPLMODAL = 0x00000000
+	MB_SYSTEMMODAL = 0x00001000
+	MB_TASKMODAL = 0x00002000
+)
+
+// MessageBox miscellaneous types.
+const (
+	MB_DEFAULT_DESKTOP_ONLY = 0x00020000
+	MB_RIGHT = 0x00080000
+	MB_RTLREADING = 0x00100000
+	MB_SETFOREGROUND = 0x00010000
+	MB_TOPMOST = 0x00040000
+	MB_SERVICE_NOTIFICATION = 0x00200000 
+)
+
+// MessageBox return values.
+const (
+	IDABORT = 3
+	IDCANCEL = 2
+	IDCONTINUE = 11
+	IDIGNORE = 5
+	IDNO = 7
+	IDOK = 1
+	IDRETRY = 4
+	IDTRYAGAIN = 10
+	IDYES = 6
+)
+
+var (
+	messageBox = user32.NewProc("MessageBoxW")
+)
+
+func MessageBox(hWnd HWND, lpText string, lpCaption string, uType uint32) (result int, err error) {
+	r1, _, err := messageBox.Call(
+		uintptr(unsafe.Pointer(hWnd)),
+		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(lpText))),
+		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(lpCaption))),
+		uintptr(uType))
+	if r1 == 0 {		// failure
+		return 0, err
+	}
+	return int(r1), nil
+}