“侦听”C / C ++中的文件更改(在Windows上)

他们有什么办法可以针对某个特定的文件,并能够接收对其进行的所有更改?

比如名为Names.txt的文件。 我可以看该文件的名称添加? 然后把它们写入控制台?

在Dev-C ++ 4.9.9.2中未编译的示例代码

#include <windows.h> #include <stdlib.h> #include <stdio.h> #include <tchar.h> void RefreshDirectory(LPTSTR); void RefreshTree(LPTSTR); void WatchDirectory(LPTSTR); int _tmain(int argc, TCHAR *argv[]) { if(argc != 2) { _tprintf(TEXT("Usage: %s <dir>\n"), argv[0]); return 1; } WatchDirectory(argv[1]); } void WatchDirectory(LPTSTR lpDir) { DWORD dwWaitStatus; HANDLE dwChangeHandles[2]; TCHAR lpDrive[4]; TCHAR lpFile[_MAX_FNAME]; TCHAR lpExt[_MAX_EXT]; _tsplitpath_s(lpDir, lpDrive, 4, NULL, 0, lpFile, _MAX_FNAME, lpExt, _MAX_EXT); lpDrive[2] = (TCHAR)'\\'; lpDrive[3] = (TCHAR)'\0'; // Watch the directory for file creation and deletion. dwChangeHandles[0] = FindFirstChangeNotification( lpDir, // directory to watch FALSE, // do not watch subtree FILE_NOTIFY_CHANGE_FILE_NAME); // watch file name changes if (dwChangeHandles[0] == INVALID_HANDLE_VALUE) { printf("\n ERROR: FindFirstChangeNotification function failed.\n"); ExitProcess(GetLastError()); } // Watch the subtree for directory creation and deletion. dwChangeHandles[1] = FindFirstChangeNotification( lpDrive, // directory to watch TRUE, // watch the subtree FILE_NOTIFY_CHANGE_DIR_NAME); // watch dir name changes if (dwChangeHandles[1] == INVALID_HANDLE_VALUE) { printf("\n ERROR: FindFirstChangeNotification function failed.\n"); ExitProcess(GetLastError()); } // Make a final validation check on our handles. if ((dwChangeHandles[0] == NULL) || (dwChangeHandles[1] == NULL)) { printf("\n ERROR: Unexpected NULL from FindFirstChangeNotification.\n"); ExitProcess(GetLastError()); } // Change notification is set. Now wait on both notification // handles and refresh accordingly. while (TRUE) { // Wait for notification. printf("\nWaiting for notification...\n"); dwWaitStatus = WaitForMultipleObjects(2, dwChangeHandles, FALSE, INFINITE); switch (dwWaitStatus) { case WAIT_OBJECT_0: // A file was created, renamed, or deleted in the directory. // Refresh this directory and restart the notification. RefreshDirectory(lpDir); if ( FindNextChangeNotification(dwChangeHandles[0]) == FALSE ) { printf("\n ERROR: FindNextChangeNotification function failed.\n"); ExitProcess(GetLastError()); } break; case WAIT_OBJECT_0 + 1: // A directory was created, renamed, or deleted. // Refresh the tree and restart the notification. RefreshTree(lpDrive); if (FindNextChangeNotification(dwChangeHandles[1]) == FALSE ) { printf("\n ERROR: FindNextChangeNotification function failed.\n"); ExitProcess(GetLastError()); } break; case WAIT_TIMEOUT: // A timeout occurred, this would happen if some value other // than INFINITE is used in the Wait call and no changes occur. // In a single-threaded environment you might not want an // INFINITE wait. printf("\nNo changes in the timeout period.\n"); break; default: printf("\n ERROR: Unhandled dwWaitStatus.\n"); ExitProcess(GetLastError()); break; } } } void RefreshDirectory(LPTSTR lpDir) { // This is where you might place code to refresh your // directory listing, but not the subtree because it // would not be necessary. _tprintf(TEXT("Directory (%s) changed.\n"), lpDir); } void RefreshTree(LPTSTR lpDrive) { // This is where you might place code to refresh your // directory listing, including the subtree. _tprintf(TEXT("Directory tree (%s) changed.\n"), lpDrive); } 

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