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有很多程序会监视剪贴板，比如迅雷，这样当你复制一个迅雷下载链接时，迅雷就可以自动启动并创建一个新的下载任务。下面我们就来看看如何实现这个技术。
实现这个技术一共需要4步：
第一步：Add the window to the clipboard viewer chain.
通过SetClipboardViewer()传入窗口句柄，所有监视剪贴板的窗口句柄会组成一个链表（后来者靠前）。这样当剪贴板内容发生变化时，Windows系统给给这些窗口发生消息。
第二步：Process the WM_CHANGECBCHAIN message.
当这个监视剪贴板的窗口句柄链表发生变化时，会收到这个消息。每个窗口都应该给下一个窗口传递消息。
这个消息的wParam和lParam说明如下：
wParam表示
A handle to the window being removedfrom the clipboard viewer chain
lParam表示
A handle to the next window in thechain following the window being removed. This parameter is NULL if thewindow being removed is the last window in the chain。
第三步：Process the WM_DRAWCLIPBOARD message.
当剪贴板数据发送变化时，窗口会依次收到这个消息。
第四步：Remove the window from the clipboard viewer chain before itis destroyed.
当窗口关闭时，应该调用ChangeClipboardChain()来通知Windows系统将自己从监视剪贴板的窗口句柄链表中移除。
代码如下（下载地址：http://download.csdn.net/download/morewindows/6793027）
- <code class="language-cpp">// 【MoreWindows工作笔记12】WM_DRAWCLIPBOARD 监视剪切板
- // http://blog.csdn.net/morewindows/article/details/17655429
- // By MoreWindows( http://blog.csdn.net/MoreWindows )
- BOOL CALLBACK DlgProc(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
- {
- static HWND s_hwnd_new_clipboard_viewer = NULL;
- static HWND s_hwnd_edit_clipboard_info = NULL;
- switch (message)
- {
- case WM_INITDIALOG:
- // 4-1 Add the window to the clipboard viewer chain.
- s_hwnd_new_clipboard_viewer = SetClipboardViewer(hDlg);
- // 把hwnd加入监视链，返回上一个加入的窗口句柄，如果是第一个，则返回值为NULL。新加的窗口在链条头部，成为“当前监视器”
- CenterWindow(hDlg);
- s_hwnd_edit_clipboard_info = GetDlgItem(hDlg, IDC_EDIT_CLIPBOARD_INFO);
- return FALSE;
- // 4-2 Process the WM_CHANGECBCHAIN message.
- case WM_CHANGECBCHAIN:
- if ((HWND)wParam == s_hwnd_new_clipboard_viewer)
- s_hwnd_new_clipboard_viewer = (HWND)lParam;
- else
- SendMessage(s_hwnd_new_clipboard_viewer, message, wParam, lParam);
- // 4-3 Process the WM_DRAWCLIPBOARD message.
- case WM_DRAWCLIPBOARD: //剪切板内容发生变化
- if (OpenClipboard(hDlg)) {
- UINT clipboard_format = EnumClipboardFormats(0);
- HGLOBAL global_memory = GetClipboardData(clipboard_format);
- DWORD data_size = GlobalSize(global_memory);
- CloseClipboard();
- WCHAR clipboard_info[1024];
- swprintf(clipboard_info, L"Clipboard\r\n Data Format = %x\r\n Data Address = 0x%x\r\n Data Size = %d", clipboard_format, global_memory, data_size);
- if (clipboard_format == CF_UNICODETEXT) {
- LPCWSTR clipboard_data = (LPCWSTR)GlobalLock(global_memory);
- if (clipboard_data != NULL) {
- wcscat(clipboard_info, L"\r\nData: \r\n");
- WCHAR buffer[1024];
- DWORD data_size = GlobalSize(global_memory);
- for (size_t i = 0; i < data_size; i++)
- buffer[i] = clipboard_data[i];
- buffer[data_size] = L'\0';
- wcscat(clipboard_info, buffer);
- }
- }
- SetWindowTextW(s_hwnd_edit_clipboard_info, clipboard_info);
- }
- return FALSE;
- case WM_COMMAND:
- switch (LOWORD(wParam))
- {
- case IDOK:
- case IDCANCEL:
- // 4-4 Remove the window from the clipboard viewer chain before it is destroyed.
- ChangeClipboardChain(hDlg, s_hwnd_new_clipboard_viewer);
- EndDialog(hDlg, FALSE);
- return TRUE;
- }
- break;
- }
- return FALSE;
- }</code>
// 【MoreWindows工作笔记12】WM_DRAWCLIPBOARD 监视剪切板// http://blog.csdn.net/morewindows/article/details/17655429// By MoreWindows( http://blog.csdn.net/MoreWindows )BOOL CALLBACK DlgProc(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam){ static HWND s_hwnd_new_clipboard_viewer = NULL; static HWND s_hwnd_edit_clipboard_info = NULL; switch (message) { case WM_INITDIALOG: // 4-1 Add the window to the clipboard viewer chain. s_hwnd_new_clipboard_viewer = SetClipboardViewer(hDlg); // 把hwnd加入监视链，返回上一个加入的窗口句柄，如果是第一个，则返回值为NULL。新加的窗口在链条头部，成为“当前监视器” CenterWindow(hDlg); s_hwnd_edit_clipboard_info = GetDlgItem(hDlg, IDC_EDIT_CLIPBOARD_INFO); return FALSE; // 4-2 Process the WM_CHANGECBCHAIN message. case WM_CHANGECBCHAIN: if ((HWND)wParam == s_hwnd_new_clipboard_viewer) s_hwnd_new_clipboard_viewer = (HWND)lParam; else SendMessage(s_hwnd_new_clipboard_viewer, message, wParam, lParam); // 4-3 Process the WM_DRAWCLIPBOARD message. case WM_DRAWCLIPBOARD: //剪切板内容发生变化 if (OpenClipboard(hDlg)) { UINT clipboard_format = EnumClipboardFormats(0); HGLOBAL global_memory = GetClipboardData(clipboard_format); DWORD data_size = GlobalSize(global_memory); CloseClipboard(); WCHAR clipboard_info[1024]; swprintf(clipboard_info, L"Clipboard\r\n Data Format = %x\r\n Data Address = 0x%x\r\n Data Size = %d", clipboard_format, global_memory, data_size); if (clipboard_format == CF_UNICODETEXT) { LPCWSTR clipboard_data = (LPCWSTR)GlobalLock(global_memory); if (clipboard_data != NULL) { wcscat(clipboard_info, L"\r\nData: \r\n"); WCHAR buffer[1024]; DWORD data_size = GlobalSize(global_memory); for (size_t i = 0; i < data_size; i++) buffer[i] = clipboard_data[i]; buffer[data_size] = L'\0'; wcscat(clipboard_info, buffer); } } SetWindowTextW(s_hwnd_edit_clipboard_info, clipboard_info); } return FALSE; case WM_COMMAND: switch (LOWORD(wParam)) { case IDOK: case IDCANCEL: // 4-4 Remove the window from the clipboard viewer chain before it is destroyed. ChangeClipboardChain(hDlg, s_hwnd_new_clipboard_viewer); EndDialog(hDlg, FALSE); return TRUE; } break; } return FALSE;}运行程序，复制《【霍比特人2：史矛革之战】》的下载链接，然后程序会显示：
最后再列一下目录，方便大家查看。
1.《【MoreWindows工作笔记9】OleGetClipboard 访问剪切板的文本内容》
http://blog.csdn.net/morewindows/article/details/17655053
2.《【MoreWindows工作笔记10】OleGetClipboard 访问剪切板上的文件信息》
http://blog.csdn.net/morewindows/article/details/17655057
3.《【MoreWindows工作笔记11】EnumClipboardFormats剪切板内容的数据格式》
http://blog.csdn.net/morewindows/article/details/17655299
4.《【MoreWindows工作笔记12】WM_DRAWCLIPBOARD 监视剪切板》
http://blog.csdn.net/morewindows/article/details/17655429
本文地址：http://blog.csdn.net/morewindows/article/details/17655429 转载请标明出处，谢谢。
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