C++ ReadDirectoryChangesW 和 Boost returns 目录更改为文件(旧名称)
C++ ReadDirectoryChangesW and Boost returns dir change as File (OLD NAME)
我有一个监视目录变化的应用程序。但是,当我重命名目录时,假设将目录 A 更改为目录 B,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:\A\test.txt
File modified: C:\A
File removed: C:\A
虽然我期望输出:
File removed: C:\A\test.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, '[=15=]', sizeof(FilePathChar));
if (!info->NextEntryOffset) break;
p += info->NextEntryOffset;
}
我做错了什么?
问题在于,在这两种情况下,您都不会收到通知,直到目录不再被称为 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
returns 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";
我有一个监视目录变化的应用程序。但是,当我重命名目录时,假设将目录 A 更改为目录 B,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:\A\test.txt
File modified: C:\A
File removed: C:\A
虽然我期望输出:
File removed: C:\A\test.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, '[=15=]', sizeof(FilePathChar));
if (!info->NextEntryOffset) break;
p += info->NextEntryOffset;
}
我做错了什么?
问题在于,在这两种情况下,您都不会收到通知,直到目录不再被称为 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
returns 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";