c# 操作视频
public
class
VedioGrap {
private
static
int
hHwnd;
//
private const int port = 2000;
private
struct
videohdr_tag {
//
private byte[] lpData;
//
private int dwBufferLength;
//
private int dwBytesUsed;
//
private int dwTimeCaptured;
//
private int dwUser;
//
private int dwFlags;
//
private int[] dwReserved;
}
private
delegate
bool
CallBack (
int
hwnd,
int
lParam); [DllImport (
"
avicap32.dll
"
, CharSet
=
CharSet.Ansi, SetLastError
=
true
, ExactSpelling
=
true
)]
private
static
extern
int
capCreateCaptureWindowA ([MarshalAs (UnmanagedType.VBByRefStr)]
ref
string
lpszWindowName,
int
dwStyle,
int
x,
int
y,
int
nWidth,
short
nHeight,
int
hWndParent,
int
nID); [DllImport (
"
avicap32.dll
"
, CharSet
=
CharSet.Ansi, SetLastError
=
true
, ExactSpelling
=
true
)]
private
static
extern
bool
capGetDriverDescriptionA (
short
wDriver, [MarshalAs (UnmanagedType.VBByRefStr)]
ref
string
lpszName,
int
cbName, [MarshalAs (UnmanagedType.VBByRefStr)]
ref
string
lpszVer,
int
cbVer); [DllImport (
"
user32
"
, CharSet
=
CharSet.Ansi, SetLastError
=
true
, ExactSpelling
=
true
)]
private
static
extern
bool
DestroyWindow (
int
hndw); [DllImport (
"
user32
"
, EntryPoint
=
"
SendMessageA
"
, CharSet
=
CharSet.Ansi, SetLastError
=
true
, ExactSpelling
=
true
)]
private
static
extern
int
SendMessage (
int
hwnd,
int
wMsg,
int
wParam, [MarshalAs (UnmanagedType.AsAny)]
object
lParam); [DllImport (
"
user32
"
, CharSet
=
CharSet.Ansi, SetLastError
=
true
, ExactSpelling
=
true
)]
private
static
extern
int
SetWindowPos (
int
hwnd,
int
hWndInsertAfter,
int
x,
int
y,
int
cx,
int
cy,
int
wFlags); [DllImport (
"
vfw32.dll
"
)]
private
static
extern
string
capVideoStreamCallback (
int
hwnd, videohdr_tag videohdr_tag); [DllImport (
"
vicap32.dll
"
, CharSet
=
CharSet.Ansi, SetLastError
=
true
, ExactSpelling
=
true
)]
private
static
extern
bool
capSetCallbackOnFrame (
int
hwnd,
string
s);
///
<summary>
///
开始载入视频
///
</summary>
public
bool
OpenCapture (Panel pnlVideo) {
bool
videostart
=
false
;
int
intWidth
=
pnlVideo.Width;
int
intHeight
=
pnlVideo.Height;
int
intDevice
=
0
;
string
refDevice
=
intDevice.ToString ();
//
创建视频窗口并得到句柄
hHwnd
=
VedioGrap.capCreateCaptureWindowA (
ref
refDevice,
1342177280
,
0
,
0
,
640
,
480
, pnlVideo.Handle.ToInt32 (),
0
);
if
(SendMessage (hHwnd,
0x40a
, intDevice,
0
)
>
0
) { SendMessage (hHwnd,
0x435
,
-
1
,
0
); SendMessage (hHwnd,
0x434
,
0x01
,
0
); SendMessage (hHwnd,
0x432
,
-
1
,
0
); SetWindowPos (hHwnd,
1
,
0
,
0
, intWidth, intHeight,
6
); videostart
=
true
; }
else
{ VedioGrap.DestroyWindow (hHwnd); videostart
=
false
; MessageBox.Show (
"
加载视频失败,请检查是否有安装设备！
"
,
"
拍照
"
); }
return
videostart; }
///
<summary>
///
停止视频
///
</summary>
public
void
StopVideo () {
//
停止视频注销视频句柄
SendMessage (hHwnd,
0x40b
,
0
,
0
); DestroyWindow (hHwnd); }
///
<summary>
///
截图
///
</summary>
///
<returns></returns>
public
Image GrapPhoto () { Image photo
=
null
; SendMessage (hHwnd,
0x41e
,
0
,
0
); IDataObject obj1
=
Clipboard.GetDataObject ();
if
(obj1.GetDataPresent (
typeof
(Bitmap))) { photo
=
(Image)obj1.GetData (
typeof
(Bitmap));
//
截完图不能关闭视频，否则无法继续截图
//
StopVideo();
}
return
photo; } }
VedioGrap vedioOperator = new VedioGrap (); //实例化视频类
videostart = vedioOperator.OpenCapture (pnlVideo); //打开视频
pbTakePhoto.Image = vedioOperator.GrapPhoto (); //拍照
vedioOperator.StopVideo (); Clipboard.Clear (); //关闭移除剪贴板数据,防止再次加载时保留上次头像