[v3 windows] Add MessageBoxIndirect

v3/pkg/w32/dialogs.go

@@ -0,0 +1,28 @@
+//go:build windows
+
+package w32
+
+import (
+	"unsafe"
+)
+
+func MessageBoxWithIcon(hwnd HWND, text *uint16, caption *uint16, iconID int, flags uint32) (int32, error) {
+
+	params := MSGBOXPARAMS{
+		cbSize:      uint32(unsafe.Sizeof(MSGBOXPARAMS{})),
+		hwndOwner:   hwnd,
+		hInstance:   0,
+		lpszText:    text,
+		lpszCaption: caption,
+		dwStyle:     flags,
+		lpszIcon:    (*uint16)(unsafe.Pointer(uintptr(iconID))),
+	}
+
+	r, _, err := procMessageBoxIndirect.Call(
+		uintptr(unsafe.Pointer(&params)),
+	)
+	if r == 0 {
+		return 0, err
+	}
+	return int32(r), nil
+}

v3/pkg/w32/typedef.go

@@ -476,6 +476,19 @@ type DIBSECTION struct {
 	DsOffset    uint32
 }
 
+type MSGBOXPARAMS struct {
+	cbSize             uint32
+	hwndOwner          HWND
+	hInstance          HANDLE
+	lpszText           *uint16
+	lpszCaption        *uint16
+	dwStyle            uint32
+	lpszIcon           *uint16
+	dwContextHelp      uintptr
+	lpfnMsgBoxCallback uintptr
+	dwLanguageId       uint32
+}
+
 // http://msdn.microsoft.com/en-us/library/windows/desktop/dd162607.aspx
 type ENHMETAHEADER struct {
 	IType          uint32

v3/pkg/w32/user32.go

@@ -67,6 +67,7 @@ var (
 	procReleaseCapture                = moduser32.NewProc("ReleaseCapture")
 	procGetWindowThreadProcessId      = moduser32.NewProc("GetWindowThreadProcessId")
 	procMessageBox                    = moduser32.NewProc("MessageBoxW")
+	procMessageBoxIndirect            = moduser32.NewProc("MessageBoxIndirectW")
 	procGetSystemMetrics              = moduser32.NewProc("GetSystemMetrics")
 	procPostThreadMessageW            = moduser32.NewProc("PostThreadMessageW")
 	procRegisterWindowMessageA        = moduser32.NewProc("RegisterWindowMessageA")
@@ -222,6 +223,13 @@ func LoadCursorWithResourceID(instance HINSTANCE, res uint16) HCURSOR {
 	return HCURSOR(ret)
 }
 
+func MessageBoxIndirect(msgbox *MSGBOXPARAMS) int32 {
+	ret, _, _ := procMessageBoxIndirect.Call(
+		uintptr(unsafe.Pointer(msgbox)))
+
+	return int32(ret)
+}
+
 func ShowWindow(hwnd HWND, cmdshow int) bool {
 	ret, _, _ := procShowWindow.Call(
 		uintptr(hwnd),