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windows: allow Windows-style printf debugging via MessageBox

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I realize that at this time, x/sys/windows is most certainly not aiming
to be some sort of UI library or anything remotely close to that.
However, MessageBox is sort of the one universal Windows API that's used
even for console programs. It's *the* classic debugging helper. It's
even pretty customary for console programs to display their usage
message in a message box rather than stdout. I realize this might be
somewhat disturbing to consider if you're in the blissful Unix utopia,
but on Windows, this is just sort of how things roll. Easy access to
MessageBox() is important.

Change-Id: I16183b69e8a27a5ddaf73d1d4e106bb7b201a6f0
Reviewed-on: https://go-review.googlesource.com/c/sys/+/178899
Run-TryBot: Jason Donenfeld <Jason@zx2c4.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Jason A. Donenfeld
2019-05-25 15:27:23 +02:00
committed by Alex Brainman
parent 56c252d053
commit ea4c425e90
3 changed files with 51 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
windows/syscall_windows.go
View File

@@ -278,6 +278,7 @@ func NewCallbackCDecl(fn interface{}) uintptr {
//sys QueryDosDevice(deviceName *uint16, targetPath *uint16, max uint32) (n uint32, err error) [failretval==0] = QueryDosDeviceW
//sys SetVolumeLabel(rootPathName *uint16, volumeName *uint16) (err error) = SetVolumeLabelW
//sys SetVolumeMountPoint(volumeMountPoint *uint16, volumeName *uint16) (err error) = SetVolumeMountPointW
//sys MessageBox(hwnd Handle, text *uint16, caption *uint16, boxtype uint32) (ret int32, err error) [failretval==0] = user32.MessageBoxW
// syscall interface implementation for other packages

35
windows/types_windows.go
View File

@@ -1298,6 +1298,41 @@ const (
ComputerNameMax = 8
)
// For MessageBox()
const (
MB_OK = 0x00000000
MB_OKCANCEL = 0x00000001
MB_ABORTRETRYIGNORE = 0x00000002
MB_YESNOCANCEL = 0x00000003
MB_YESNO = 0x00000004
MB_RETRYCANCEL = 0x00000005
MB_CANCELTRYCONTINUE = 0x00000006
MB_ICONHAND = 0x00000010
MB_ICONQUESTION = 0x00000020
MB_ICONEXCLAMATION = 0x00000030
MB_ICONASTERISK = 0x00000040
MB_USERICON = 0x00000080
MB_ICONWARNING = MB_ICONEXCLAMATION
MB_ICONERROR = MB_ICONHAND
MB_ICONINFORMATION = MB_ICONASTERISK
MB_ICONSTOP = MB_ICONHAND
MB_DEFBUTTON1 = 0x00000000
MB_DEFBUTTON2 = 0x00000100
MB_DEFBUTTON3 = 0x00000200
MB_DEFBUTTON4 = 0x00000300
MB_APPLMODAL = 0x00000000
MB_SYSTEMMODAL = 0x00001000
MB_TASKMODAL = 0x00002000
MB_HELP = 0x00004000
MB_NOFOCUS = 0x00008000
MB_SETFOREGROUND = 0x00010000
MB_DEFAULT_DESKTOP_ONLY = 0x00020000
MB_TOPMOST = 0x00040000
MB_RIGHT = 0x00080000
MB_RTLREADING = 0x00100000
MB_SERVICE_NOTIFICATION = 0x00200000
)
const (
MOVEFILE_REPLACE_EXISTING = 0x1
MOVEFILE_COPY_ALLOWED = 0x2

15
windows/zsyscall_windows.go
View File

@@ -41,6 +41,7 @@ var (
moduserenv = NewLazySystemDLL("userenv.dll")
modmswsock = NewLazySystemDLL("mswsock.dll")
modcrypt32 = NewLazySystemDLL("crypt32.dll")
moduser32 = NewLazySystemDLL("user32.dll")
modws2_32 = NewLazySystemDLL("ws2_32.dll")
moddnsapi = NewLazySystemDLL("dnsapi.dll")
modiphlpapi = NewLazySystemDLL("iphlpapi.dll")
@@ -213,6 +214,7 @@ var (
procQueryDosDeviceW = modkernel32.NewProc("QueryDosDeviceW")
procSetVolumeLabelW = modkernel32.NewProc("SetVolumeLabelW")
procSetVolumeMountPointW = modkernel32.NewProc("SetVolumeMountPointW")
procMessageBoxW = moduser32.NewProc("MessageBoxW")
procWSAStartup = modws2_32.NewProc("WSAStartup")
procWSACleanup = modws2_32.NewProc("WSACleanup")
procWSAIoctl = modws2_32.NewProc("WSAIoctl")
@@ -2316,6 +2318,19 @@ func SetVolumeMountPoint(volumeMountPoint *uint16, volumeName *uint16) (err erro
return
}
func MessageBox(hwnd Handle, text *uint16, caption *uint16, boxtype uint32) (ret int32, err error) {
r0, _, e1 := syscall.Syscall6(procMessageBoxW.Addr(), 4, uintptr(hwnd), uintptr(unsafe.Pointer(text)), uintptr(unsafe.Pointer(caption)), uintptr(boxtype), 0, 0)
ret = int32(r0)
if ret == 0 {
if e1 != 0 {
err = errnoErr(e1)
} else {
err = syscall.EINVAL
}
}
return
}
func WSAStartup(verreq uint32, data *WSAData) (sockerr error) {
r0, _, _ := syscall.Syscall(procWSAStartup.Addr(), 2, uintptr(verreq), uintptr(unsafe.Pointer(data)), 0)
if r0 != 0 {