Visual C++ Clipboard 剪切板操作一.使用SetClipboardData 方法赋值二.获取Clipboard数据三.Clipboard Formats四.Private Clipboard Formats五.Providing Data in Multiple Formats六.查询可用Formats

 

一.使用SetClipboardData 方法赋值

首先用GlobalAlloc方法分配内存

1. GlobalAlloc 分配内存大小
2. GlobalLock 锁定内存
3. 拷贝数据到内存中
4. GlobalUnlock解锁 

OpenClipboard 和CloseClipboard相对应

char szText[]= "Hello, world"; // ANSI characters
if (::OpenClipboard (m_hWnd)) {
::EmptyClipboard ();
HANDLE hData = ::GlobalAlloc (GMEM_MOVEABLE, ::lstrlen (szText) + 1);
LPSTR pData = (LPSTR) ::GlobalLock (hData);
::lstrcpy (pData, szText);
::GlobalUnlock (hData);
::SetClipboardData (CF_TEXT, hData);
::CloseClipboard ();

二.获取Clipboard数据

GetClipboardData 方法获取 
GlobalLock 方法可以转型数据(返回是一个VOID指针)

char szText[MAX_PATH];
if (::OpenClipboard (m_hWnd)) {
HANDLE hData = ::GetClipboardData (CF_TEXT);
if (hData != NULL) {
LPCSTR pData = (LPCSTR) ::GlobalLock (hData);
if (::lstrlen (pData) < MAX_PATH)
::lstrcpy (szText, pData);
::GlobalUnlock (hData);
}
::CloseClipboard ();
}

 

三.Clipboard Formats

不仅仅是字符串复制一个Bitmap图片,

if (::OpenClipboard (m_hWnd)) {
// Make a copy of the bitmap.
BITMAP bm;
CBitmap bitmap;
CBitmap m_bitmap;
m_bitmap.LoadBitmap(IDB_BITMAP2);
m_bitmap.GetObject (sizeof (bm), &bm);
bitmap.CreateBitmapIndirect (&bm);
CDC dcMemSrc, dcMemDest;
dcMemSrc.CreateCompatibleDC (NULL);
CBitmap* pOldBitmapSrc = dcMemSrc.SelectObject (&m_bitmap);
dcMemDest.CreateCompatibleDC (NULL);
CBitmap* pOldBitmapDest = dcMemDest.SelectObject (&bitmap);
dcMemDest.BitBlt (0, 0, bm.bmWidth, bm.bmHeight, &dcMemSrc,
0, 0, SRCCOPY);
HBITMAP hBitmap = (HBITMAP) bitmap.Detach ();
dcMemDest.SelectObject (pOldBitmapDest);
dcMemSrc.SelectObject (pOldBitmapSrc);
// Place the copy on the clipboard.
::EmptyClipboard ();
::SetClipboardData (CF_BITMAP, hBitmap);
::CloseClipboard ();
}

获取复制的Bitmap

if (::OpenClipboard (m_hWnd)) {
HBITMAP hBitmap = (HBITMAP) ::GetClipboardData (CF_BITMAP);
if (hBitmap != NULL) {
// Make a local copy of the bitmap.
}
::CloseClipboard ();
}

四.Private Clipboard Formats

除了内置格式,还可以自定义格式

1. UINT nID = ::RegisterClipboardFormat (_T ("Widget"));
2. ::SetClipboardData (nID, hData);
3. HANDLE hData = ::GetClipboardData (nID);

五.Providing Data in Multiple Formats

可以将多种格式的数据存在Clipboard中

::SetClipboardData (nID, hPrivateData);
::SetClipboardData (CF_BITMAP, hBitmap);
::SetClipboardData (CF_TEXT, hTextData);

六.查询可用Formats

1.判断不同格式(IsClipboardFormatAvailable),注意没用完Clipboard时,不要关闭Clipboard,所以把CloseClipboard放最后

if (::OpenClipboard (m_hWnd)) {
if (::IsClipboardFormatAvailable (nID)) {
// Perfect!
}
else if (::IsClipboardFormatAvailable (CF_TEXT)) {
// Not the best, but I'll take it.
}
else if (::IsClipboardFormatAvailable (CF_BITMAP)) {
// Better than nothing.
}
::CloseClipboard ();
}

2.获取后的处理方式同上

if (::OpenClipboard (m_hWnd)) {
if (::IsClipboardFormatAvailable (CF_TEXT)) {
HANDLE hData = ::GetClipboardData (CF_TEXT);
LPCSTR pData = (LPCSTR) ::GlobalLock (hData);
}
::CloseClipboard ();
}

参考:MFC Windows程序设计