private
static
Hashtable processWnd =
null
;
public
delegate
bool
WNDENUMPROC(IntPtr hwnd,
uint
lParam);
static
User32API()
if
(processWnd ==
null
)
processWnd
=
new
Hashtable();
[DllImport(
"
user32.dll
"
, EntryPoint =
"
EnumWindows
"
, SetLastError =
true
)]
public
static
extern
bool
EnumWindows(WNDENUMPROC lpEnumFunc,
uint
lParam);
[DllImport(
"
user32.dll
"
, EntryPoint =
"
GetParent
"
, SetLastError =
true
)]
public
static
extern
IntPtr GetParent(IntPtr hWnd);
[DllImport(
"
user32.dll
"
, EntryPoint =
"
GetWindowThreadProcessId
"
)]
public
static
extern
uint
GetWindowThreadProcessId(IntPtr hWnd,
ref
uint
lpdwProcessId);
[DllImport(
"
user32.dll
"
, EntryPoint =
"
IsWindow
"
)]
public
static
extern
bool
IsWindow(IntPtr hWnd);
[DllImport(
"
kernel32.dll
"
, EntryPoint =
"
SetLastError
"
)]
public
static
extern
void
SetLastError(
uint
dwErrCode);
public
static
IntPtr GetCurrentWindowHandle()
IntPtr ptrWnd
=
IntPtr.Zero;
uint
uiPid = (
uint
)Process.GetCurrentProcess().Id;
//
当前进程 ID
object
objWnd =
processWnd[uiPid];
if
(objWnd !=
null
)
ptrWnd
=
(IntPtr)objWnd;
if
(ptrWnd != IntPtr.Zero && IsWindow(ptrWnd))
//
从缓存中获取句柄
return
ptrWnd;
ptrWnd
=
IntPtr.Zero;
bool
bResult = EnumWindows(
new
WNDENUMPROC(EnumWindowsProc), uiPid);
//
枚举窗口返回 false 并且没有错误号时表明获取成功
if
(!bResult && Marshal.GetLastWin32Error() ==
0
)
objWnd
=
processWnd[uiPid];
if
(objWnd !=
null
)
ptrWnd
=
(IntPtr)objWnd;
return
ptrWnd;
private
static
bool
EnumWindowsProc(IntPtr hwnd,
uint
lParam)
uint
uiPid =
0
;
if
(GetParent(hwnd) ==
IntPtr.Zero)
GetWindowThreadProcessId(hwnd,
ref
uiPid);
if
(uiPid == lParam)
//
找到进程对应的主窗口句柄
processWnd[uiPid] = hwnd;
//
把句柄缓存起来
SetLastError(
0
);
//
设置无错误
return
false
;
//
返回 false 以终止枚举窗口
return
true
;
调用User32API.GetCurrentWindowHandle()即可返回当前进程的主窗口句柄，如果获取失败则返回IntPtr.Zero。
