func TestFormatMessage(t *testing.T) {
dll := windows.MustLoadDLL("pdh.dll")
pdhOpenQuery := func(datasrc *uint16, userdata uint32, query *windows.Handle) (errno uintptr) {
r0, _, _ := syscall.Syscall(dll.MustFindProc("PdhOpenQueryW").Addr(), 3, uintptr(unsafe.Pointer(datasrc)), uintptr(userdata), uintptr(unsafe.Pointer(query)))
return r0
}
pdhCloseQuery := func(query windows.Handle) (errno uintptr) {
r0, _, _ := syscall.Syscall(dll.MustFindProc("PdhCloseQuery").Addr(), 1, uintptr(query), 0, 0)
return r0
}
var q windows.Handle
name, err := windows.UTF16PtrFromString("no_such_source")
if err != nil {
t.Fatal(err)
}
errno := pdhOpenQuery(name, 0, &q)
if errno == 0 {
pdhCloseQuery(q)
t.Fatal("PdhOpenQuery succeeded, but expected to fail.")
}
const flags uint32 = syscall.FORMAT_MESSAGE_FROM_HMODULE | syscall.FORMAT_MESSAGE_ARGUMENT_ARRAY | syscall.FORMAT_MESSAGE_IGNORE_INSERTS
buf := make([]uint16, 300)
_, err = windows.FormatMessage(flags, uintptr(dll.Handle), uint32(errno), 0, buf, nil)
if err != nil {
t.Fatal("FormatMessage for handle=%x and errno=%x failed: %v", dll.Handle, errno, err)
}
}
func TestWin32finddata(t *testing.T) {
dir, err := ioutil.TempDir("", "go-build")
if err != nil {
t.Fatalf("failed to create temp directory: %v", err)
}
defer os.RemoveAll(dir)
path := filepath.Join(dir, "long_name.and_extension")
f, err := os.Create(path)
if err != nil {
t.Fatalf("failed to create %v: %v", path, err)
}
f.Close()
type X struct {
fd windows.Win32finddata
got byte
pad [10]byte // to protect ourselves
}
var want byte = 2 // it is unlikely to have this character in the filename
x := X{got: want}
pathp, _ := windows.UTF16PtrFromString(path)
h, err := windows.FindFirstFile(pathp, &(x.fd))
if err != nil {
t.Fatalf("FindFirstFile failed: %v", err)
}
err = windows.FindClose(h)
if err != nil {
t.Fatalf("FindClose failed: %v", err)
}
if x.got != want {
t.Fatalf("memory corruption: want=%d got=%d", want, x.got)
}
}