C++ ReadDirectoryChangesW 和 Boost 将目录更改作为文件(旧名称）返回

C++ ReadDirectoryChangesW and Boost returns dir change as File (OLD NAME)

本文关键字：文件 返回 Boost ReadDirectoryChangesW C++      更新时间：2023-10-16

我有一个应用程序正在监视目录的更改。但是，当我重命名目录时，假设目录 A 进入目录 B，那么我将看到以下输出结果：

File renamed (OLD): C:A
Directory renamed (NEW): C:B

虽然我期望输出：

Directory renamed (OLD): C:A
Directory renamed (NEW): C:B

这种情况也发生在删除目录时，给出输出：

File removed: C:Atest.txt
File modified: C:A
File removed: C:A

虽然我期望输出：

File removed: C:Atest.txt
Directory modified: C:A
Directory removed: C:A

我用来获取此输出的代码(使用 Boost 的文件系统(是：

while(true) {
FILE_NOTIFY_INFORMATION* info = reinterpret_cast<FILE_NOTIFY_INFORMATION*>(p);
int ret = ::WideCharToMultiByte(CP_ACP, 0, info->FileName, info->FileNameLength / sizeof(WCHAR), FilePathChar, sizeof(FilePathChar), NULL, NULL);
stringstream FilePathStream;
FilePathStream << argv[1];
FilePathStream << "\";
FilePathStream << FilePathChar;
string FilePath = FilePathStream.str();
cout << FilePath << endl;
boost::filesystem::path path(FilePath);
string Type = "File";
if (boost::filesystem::is_directory(path)) {
Type = "Directory";
}
ofstream myfile;
myfile.open("changes.txt", std::ios_base::app);
switch (info->Action) {
case FILE_ACTION_ADDED:
myfile << Type << " added: " << FilePath << "n";
break;
case FILE_ACTION_MODIFIED:
myfile << Type << " modified: " << FilePath << "n";
break;
case FILE_ACTION_REMOVED:
myfile << Type << " removed: " << FilePath << "n";
break;
case FILE_ACTION_RENAMED_NEW_NAME:
myfile << Type << " renamed (NEW): " << FilePath << "n";
break;
case FILE_ACTION_RENAMED_OLD_NAME:
myfile << Type << " renamed (OLD): " << FilePath << "n";
break;
default:
myfile << Type << " UNDISCOVERED ACTION: " << FilePath << "n";
break;
}
myfile.close();
::memset(FilePathChar, '', sizeof(FilePathChar));
if (!info->NextEntryOffset) break;
p += info->NextEntryOffset;
}

我在这里做错了什么？

问题是，在这两种情况下，您都不会收到通知，直到目录不再被调用C:A(因为它已被删除或移动(。 所以当你去的时候：

if (boost::filesystem::is_directory(path)) {
Type = "Directory";
}

is_directory返回false(因此您将Type保留为"File"(

我建议改为：

const std::string Type = boost::filesystem::is_directory(path)    ? "Directory" :
boost::filesystem::is_regular_file(path) ? "File" :
"unknown";
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