javaxt-core-dll/FileSystemWatcherNative.cpp at main · javaxt-project/javaxt-core-dll · GitHub

History

240 lines (195 loc) · 8.64 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

//******************************************************************************

//** FileSystemWatcherNative Class

//******************************************************************************

/**

* JNI code used to monitor changes made to a directory.

******************************************************************************/

// This file needs to be compiled with _UNICODE flag, since java string uses unicode.

#include "stdafx.h"

#include "FileSystemWatcherNative.h"

#include <sstream>

#include <ctime>

using namespace std;

BOOL bWatchSubtree; //flag used to set whether to watch subdirectories

DWORD dwNotifyFilter; //notification filter

HANDLE hDirectory; //handle to the directory being monitored

wstring sDirectory; //a string representing the path to the directory

size_t nBufSize = 32*1024;

FILE_NOTIFY_INFORMATION* pBuffer = (FILE_NOTIFY_INFORMATION*)calloc(1, nBufSize);

FILE_NOTIFY_INFORMATION* pBufferCurrent;

//**************************************************************************

//** FindFirstChangeNotification

//**************************************************************************

/**

* Class: FileSystemWatcherNative

* Method: FindFirstChangeNotification

* Signature: (Ljava/lang/String;ZI)J

JNIEXPORT jlong JNICALL Java_javaxt_io_FileSystemWatcherNative_FindFirstChangeNotification

(JNIEnv* env, jclass, jstring filename, jboolean javaWatchSubtree, jint javaNotifyFilter)

{

//Convert jstring to wstring

const jchar *_filename = env->GetStringChars(filename, 0);

jsize len = env->GetStringLength(filename);

sDirectory.assign(_filename, _filename + len);

env->ReleaseStringChars(filename, _filename);

//Update Inputs

bWatchSubtree = (BOOL)javaWatchSubtree;

dwNotifyFilter = //(DWORD)javaNotifyFilter;

FILE_NOTIFY_CHANGE_LAST_WRITE| // Triggered when a file or directory has been modified

FILE_NOTIFY_CHANGE_DIR_NAME| // Triggered when a directory has been created or deleted

FILE_NOTIFY_CHANGE_FILE_NAME; // Triggered when a file has been created or deleted

//Call FindFirstChangeNotification

HANDLE handle = FindFirstChangeNotificationW(sDirectory.c_str(), bWatchSubtree, dwNotifyFilter);

if (handle == INVALID_HANDLE_VALUE || handle == (HANDLE)ERROR_INVALID_FUNCTION){

DWORD errorCode = GetLastError();

stringstream ss;

ss << "FindFirstChangeNotification failed. Error Code: " << errorCode;

const char* msg = (const char*)( ss.str().c_str());

jclass exceptionClass = env->FindClass("java/lang/Exception");

env->ThrowNew(exceptionClass, msg );

}

//Create File Handle

hDirectory = CreateFileW(

sDirectory.c_str(), // pointer to the directory

GENERIC_READ, // access (read/write) mode

FILE_SHARE_READ|

FILE_SHARE_WRITE|

FILE_SHARE_DELETE, // share mode

NULL, // security descriptor

OPEN_EXISTING, // how to create

FILE_FLAG_BACKUP_SEMANTICS, // file attributes

NULL // file with attributes to copy

);

//Return FindFirstChangeNotification Handle

return (jlong)handle;

}

//**************************************************************************

//** FindNextChangeNotification

//**************************************************************************

/**

* Class: FileSystemWatcherNative

* Method: FindNextChangeNotification

* Signature: (J)V

JNIEXPORT void JNICALL Java_javaxt_io_FileSystemWatcherNative_FindNextChangeNotification

(JNIEnv *javaEnv, jclass, jlong handle)

{

if (!FindNextChangeNotification((HANDLE) handle)){

DWORD errorCode = GetLastError();

stringstream ss;

ss << "FindNextChangeNotification failed. Error Code: " << errorCode;

const char* msg = (const char*)( ss.str().c_str());

jclass exceptionClass = javaEnv->FindClass("java/lang/Exception");

javaEnv->ThrowNew(exceptionClass, msg);

}

//**************************************************************************

//** FindCloseChangeNotification

//**************************************************************************

/**

* Class: FileSystemWatcherNative

* Method: FindCloseChangeNotification

* Signature: (J)V

JNIEXPORT void JNICALL Java_javaxt_io_FileSystemWatcherNative_FindCloseChangeNotification

(JNIEnv *javaEnv, jclass, jlong handle)

{

if (!FindCloseChangeNotification((HANDLE) handle)){

DWORD errorCode = GetLastError();

stringstream ss;

ss << "FindCloseChangeNotification failed. Error Code: " << errorCode;

const char* msg = (const char*)( ss.str().c_str());

jclass exceptionClass = javaEnv->FindClass("java/lang/Exception");

javaEnv->ThrowNew(exceptionClass, msg);

}

//Close File Handle

if (hDirectory!=NULL){

CloseHandle(hDirectory);

}

//**************************************************************************

//** WaitForSingleObject

//**************************************************************************

/**

* Class: FileSystemWatcherNative

* Method: WaitForSingleObject

* Signature: (JI)I

JNIEXPORT jint JNICALL Java_javaxt_io_FileSystemWatcherNative_WaitForSingleObject

(JNIEnv *javaEnv , jclass, jlong hWaitHandle, jint waitTimeoutMillis)

{

return WaitForSingleObject((HANDLE) hWaitHandle, (DWORD) waitTimeoutMillis);

}

std::wstring s2ws(const std::string& s){

int len;

int slength = (int)s.length() + 1;

len = MultiByteToWideChar(CP_ACP, 0, s.c_str(), slength, 0, 0);

wchar_t* buf = new wchar_t[len];

MultiByteToWideChar(CP_ACP, 0, s.c_str(), slength, buf, len);

std::wstring r(buf);

delete[] buf;

return r;

}

//**************************************************************************

//** ReadDirectoryChangesW

//**************************************************************************

/**

* Class: FileSystemWatcherNative

* Method: ReadDirectoryChangesW

* Signature: (Ljava/lang/String;ZI)J

JNIEXPORT jstring JNICALL Java_javaxt_io_FileSystemWatcherNative_ReadDirectoryChangesW

(JNIEnv *env, jclass)

{

wstringstream ss;

DWORD BytesReturned;

if (ReadDirectoryChangesW(

hDirectory, // handle to directory

pBuffer, // read results buffer

nBufSize, // length of buffer

bWatchSubtree, // WatchSubtree

dwNotifyFilter, // notification filter

&BytesReturned, // bytes returned

NULL, // overlapped buffer

NULL // completion routine

)){

//Iterate through the file changes

pBufferCurrent = pBuffer;

while(pBufferCurrent){

//Get current timestamp

time_t d = time(NULL);

string date( ctime(&d) );

date.erase(date.find_last_not_of(" \t\n")+1); //right trim

//Get action

wstring action = L"";

switch(pBufferCurrent->Action){

case FILE_ACTION_ADDED: action = L"Create"; break;

case FILE_ACTION_REMOVED: action = L"Delete"; break;

case FILE_ACTION_MODIFIED: action = L"Modify"; break;

case FILE_ACTION_RENAMED_OLD_NAME: action = L"Rename"; break;

case FILE_ACTION_RENAMED_NEW_NAME: action = L"Renam2"; break;

}

//Get filename

WCHAR* _filename = pBufferCurrent->FileName;

int len = (int)pBufferCurrent->FileNameLength/2;

wstring filename;

filename.assign(_filename, _filename + len);

//Join date, action, and filename into 1 event string

ss << L"[" << s2ws(date) << L"] " << action << L" " << sDirectory << filename << L"\n";

//Update pBufferCurrent

if (pBufferCurrent->NextEntryOffset)

pBufferCurrent = (FILE_NOTIFY_INFORMATION*)(((BYTE*)pBufferCurrent) + pBufferCurrent->NextEntryOffset);

else

pBufferCurrent = NULL;

} //end while pBufferCurrent

}

wstring event = ss.str();

int len = event.size();

jchar* raw = new jchar[len];

memcpy(raw, event.c_str(), len*sizeof(wchar_t));

jstring result = env->NewString(raw, len);

delete[] raw;

return result;

}

javaxt-core-dll/FileSystemWatcherNative.cpp at main · javaxt-project/javaxt-core-dll · GitHub

Uh oh!

Expand file tree

Breadcrumbs

FileSystemWatcherNative.cpp

Latest commit

History

Breadcrumbs

FileSystemWatcherNative.cpp

File metadata and controls