如何使用TWAIN预览相机 [英] How To Use TWAIN To Preview Camera
问题描述
现在，只获得一张图片：
1，获取点到DSM_Entry（）
m_hDSMDLL = LoadLibrary（TWAIN_32.DLL）;
m_lpDSMEntry =（DSMENTRYPROC）GetProcAddress（m_hDSMDLL，MAKEINTRESOURCE（1））;
2，Open SourceManager
rc =（* m_lpDSMEntry）（&m_AppId，NULL，DG_CONTROL，DAT_PARENT，
MSG_OPENDSM，（TW_MEMREF）&m_hWnd）;
3，选择来源
rc =（* m_lpDSMEntry）（&m_AppId，NULL，DG_CONTROL，DAT_IDENTITY，
MSG_USERSELECT， （TW_MEMREF）&m_SourceId）;
4，开源
rc =（* m_lpDSMEntry）（&m_AppId，NULL，DG_CONTROL，DAT_IDENTITY，
MSG_OPENDS，（TW_MEMREF）&m_SourceId）;
5，启用来源
TW_USERINTERFACE twUserInterface;
twUserInterface.ShowUI = FALSE; //
twUserInterface.ModalUI = TRUE;
twUserInterface.hParent =（TW_HANDLE）m_hWnd;
rc =（* m_lpDSMEntry）（&m_AppId， &m_SourceId，DG_CONTROL，DAT_USERINTERFACE，
MSG_ENABLEDS，（TW_MEMREF）&twUserInterface）;
6，转移图片
HANDLE hBitmap = NULL;
rc =（* m_lpDSMEntry）（&m_AppId，&m_SourceId，DG_IMAGE，DAT_IMAGENATIVEXFER，
MSG_GET，（TW_MEMREF）&hBitmap）; //原生模式
7，收到的图片
TW_PENDINGXFERS twPendingXfer;
rc =（* m_lpDSMEntry）（ &m_AppId，&m_SourceId，DG_CONTROL，
DAT_PENDINGXFERS，MSG_ENDXFER和twPendingXfer）;
8，禁用来源
rc =（* m_lpDSMEntry）（&m_AppId，&m_SourceId，DG_CONTROL，
DAT_USERINTERFACE ，MSG_DISABLEDS，（TW_MEMREF）&twUserInterface）;
但是，如何通过连续的帧流或视频流预览相机？
（为了实时显示，我现在暂时用了不是办法的办法：就是在不断的循环5~8的流程，但是实时性是很差的。
不知道真正的Twain实时显示应该怎么写？）
Now,only get one image（现在只能实现单帧采图的功能）:
1、Get Point To DSM_Entry()
m_hDSMDLL = LoadLibrary("TWAIN_32.DLL");
m_lpDSMEntry = (DSMENTRYPROC)GetProcAddress(m_hDSMDLL, MAKEINTRESOURCE(1));
2、Open SourceManager
rc = (*m_lpDSMEntry)(&m_AppId, NULL, DG_CONTROL, DAT_PARENT,
MSG_OPENDSM, (TW_MEMREF)&m_hWnd);
3、Select Source
rc = (*m_lpDSMEntry)(&m_AppId, NULL, DG_CONTROL, DAT_IDENTITY,
MSG_USERSELECT, (TW_MEMREF)&m_SourceId);
4、Open Source
rc = (*m_lpDSMEntry)(&m_AppId, NULL, DG_CONTROL, DAT_IDENTITY,
MSG_OPENDS, (TW_MEMREF)&m_SourceId);
5、Enable Source
TW_USERINTERFACE twUserInterface;
twUserInterface.ShowUI = FALSE; //
twUserInterface.ModalUI = TRUE;
twUserInterface.hParent = (TW_HANDLE)m_hWnd;
rc = (*m_lpDSMEntry)(&m_AppId, &m_SourceId, DG_CONTROL, DAT_USERINTERFACE,
MSG_ENABLEDS, (TW_MEMREF)&twUserInterface);
6、Transfer Image
HANDLE hBitmap = NULL;
rc = (*m_lpDSMEntry)(&m_AppId, &m_SourceId, DG_IMAGE, DAT_IMAGENATIVEXFER,
MSG_GET, (TW_MEMREF)&hBitmap); // Native Mode
7、Received Image
TW_PENDINGXFERS twPendingXfer;
rc = (*m_lpDSMEntry)(&m_AppId, &m_SourceId, DG_CONTROL,
DAT_PENDINGXFERS, MSG_ENDXFER, &twPendingXfer);
8、Disable Source
rc = (*m_lpDSMEntry)(&m_AppId, &m_SourceId, DG_CONTROL,
DAT_USERINTERFACE, MSG_DISABLEDS, (TW_MEMREF)&twUserInterface);
But,how to preview camera through a continuous flow of frames or streaming video?
（为了实时显示，我现在暂时用了不是办法的办法：就是在不断的循环5~8的流程，但是实时性是很差的。
不知道真正的Twain实时显示应该怎么写？？）
推荐答案
WIA是一种基于STI而不需要TWAIN的成像架构，尽管WIA仍然支持TWAIN。
http://msdn.microsoft.com/de-de/ library / ms630368.aspx [ ^ ]
你应该考虑一下Dire ct-显示视频。
WIA is an imaging architecture that builds on STI and does not require TWAIN, although TWAIN is still supported alongside WIA.
http://msdn.microsoft.com/de-de/library/ms630368.aspx[^]
You should think about Direct-Show for video.
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