Hello i want to suspend a process for 10 mins after resuming it with console application.
I found this code:
bool Suspended = false;
BOOL SuspendProcess(DWORD ProcessId, bool Suspend)
{
HANDLE snHandle = NULL;
BOOL rvBool = FALSE;
THREADENTRY32 te32 = { 0 };
snHandle = CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, 0);
if (snHandle == INVALID_HANDLE_VALUE) return (FALSE);
te32.dwSize = sizeof(THREADENTRY32);
if (Thread32First(snHandle, &te32))
{
do
{
if (te32.th32OwnerProcessID == ProcessId)
{
HANDLE hThread = OpenThread(THREAD_SUSPEND_RESUME, FALSE, te32.th32ThreadID);
if (Suspend == false)
{
if (Suspended)ResumeThread(hThread);
}
else
{
SuspendThread(hThread);
Suspended = true;
}
CloseHandle(hThread);
}
} while (Thread32Next(snHandle, &te32));
rvBool = TRUE;
}
else
rvBool = FALSE;
CloseHandle(snHandle);
return (rvBool);
}
But it doesn't works when i execute, it doesn't anything... How to suspend a process and resuming it after 10 minutes? Like notepad it can be with pid number or name(Notepad.exe)???
Related
I created a small windows service to capture some events, including the system shutdown. Every time I turn off the computer, the service event is not called. But when I restart the computer the event works normally.
I already tried to use: SERVICE_ACCEPT_PRESHUTDOWN + SERVICE_CONTROL_PRESHUTDOWN and was not successful.
How could I catch the computer shutdown event?
Ps: After compiling I register the service with the following command: sc.exe create "ZSimpleService" binPath = "C:\path\ZSimpleService.exe"
Edit 1: I'm using windows 10
Code:
SERVICE_STATUS g_ServiceStatus = { 0 };
SERVICE_STATUS_HANDLE g_StatusHandle = NULL;
HANDLE g_ServiceStopEvent = INVALID_HANDLE_VALUE;
VOID WINAPI ServiceMain(DWORD argc, LPTSTR *argv);
DWORD WINAPI ServiceWorkerThread(LPVOID lpParam);
DWORD WINAPI CtrlHandlerEx(DWORD CtrlCode, DWORD eventType, LPVOID eventData, LPVOID context);
#define SERVICE_NAME _T("ZSimpleService")
VOID WINAPI ServiceMain(DWORD argc, LPTSTR *argv) {
g_StatusHandle = RegisterServiceCtrlHandlerEx(SERVICE_NAME, CtrlHandlerEx,
NULL);
if (g_StatusHandle == NULL) {
goto EXIT;
}
// Tell the service controller we are starting
ZeroMemory( & g_ServiceStatus, sizeof(g_ServiceStatus));
g_ServiceStatus.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
g_ServiceStatus.dwControlsAccepted = SERVICE_ACCEPT_STOP
| SERVICE_ACCEPT_POWEREVENT | SERVICE_ACCEPT_SESSIONCHANGE
| SERVICE_ACCEPT_SHUTDOWN;
g_ServiceStatus.dwCurrentState = SERVICE_START_PENDING;
g_ServiceStatus.dwWin32ExitCode = 0;
g_ServiceStatus.dwServiceSpecificExitCode = 0;
g_ServiceStatus.dwCheckPoint = 0;
if (SetServiceStatus(g_StatusHandle, &g_ServiceStatus) == FALSE) {
//...
}
g_ServiceStopEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
if (g_ServiceStopEvent == NULL) {
//...
goto EXIT;
}
g_ServiceStatus.dwCurrentState = SERVICE_RUNNING;
g_ServiceStatus.dwWin32ExitCode = 0;
g_ServiceStatus.dwCheckPoint = 0;
if (SetServiceStatus(g_StatusHandle, &g_ServiceStatus) == FALSE) {
//...
}
HANDLE hThread = CreateThread(NULL, 0, ServiceWorkerThread, NULL, 0, NULL);
WaitForSingleObject(hThread, INFINITE);
CloseHandle(g_ServiceStopEvent);
g_ServiceStatus.dwCurrentState = SERVICE_STOPPED;
g_ServiceStatus.dwWin32ExitCode = 0;
g_ServiceStatus.dwCheckPoint = 3;
if (SetServiceStatus(g_StatusHandle, &g_ServiceStatus) == FALSE) {
}
EXIT: return;
}
void suspending() {
FILE *file = fopen("C:\\test\\suspending.txt", "w+");
if (file)
fprintf(file, "...");
}
void logoff() {
FILE *file = fopen("C:\\test\\logoff.txt", "w+");
if (file)
fprintf(file, "...");
}
void lock_session() {
FILE *file = fopen("C:\\test\\lock_session.txt", "w+");
if (file)
fprintf(file, "...");
}
void poweroff() {
FILE *file = fopen("C:\\test\\poweroff.txt", "w+");
if (file)
fprintf(file, "...");
}
DWORD WINAPI CtrlHandlerEx(DWORD CtrlCode, DWORD eventType, LPVOID eventData,
LPVOID context) {
switch (CtrlCode) {
case SERVICE_CONTROL_STOP: {
g_ServiceStatus.dwCurrentState = SERVICE_STOP_PENDING;
g_ServiceStatus.dwWin32ExitCode = 0;
g_ServiceStatus.dwCheckPoint = 0;
g_ServiceStatus.dwWaitHint = 0;
if (SetServiceStatus(g_StatusHandle, &g_ServiceStatus) == FALSE) {
//...
}
SetEvent(g_ServiceStopEvent);
return NO_ERROR;
}
case SERVICE_CONTROL_POWEREVENT: {
if (eventType == PBT_APMQUERYSUSPEND) {
//Computer is suspending
suspending();
}
return NO_ERROR;
}
case SERVICE_CONTROL_SESSIONCHANGE: {
switch (eventType) {
case WTS_SESSION_LOGOFF:
//User is logging off
logoff();
break;
case WTS_SESSION_LOCK:
//User locks the session
lock_session();
break;
}
return NO_ERROR;
}
case SERVICE_CONTROL_SHUTDOWN: {
//Computer is shutting down
poweroff();
return NO_ERROR;
}
default:
return ERROR_CALL_NOT_IMPLEMENTED;
}
}
DWORD WINAPI ServiceWorkerThread(LPVOID lpParam) {
while (WaitForSingleObject(g_ServiceStopEvent, 0) != WAIT_OBJECT_0) {
//many cool code....
Sleep(3000);
}
return 0;
}
DWORD RunService() {
SERVICE_TABLE_ENTRY serviceTable[] = { { SERVICE_NAME, ServiceMain },
{ 0, 0 } };
if (StartServiceCtrlDispatcher(serviceTable)) {
return 0;
} else {
DWORD erro = GetLastError();
//handler erro...
return 1;
}
}
int _tmain(int argc, TCHAR *argv[]) {
RunService();
return 0;
}
When the fast startup option enabled, click start menu -> shutdown will put the machine into sleep mode/hibernation instead of shutdown. But restart menu isn't affected. (And shuting down from command line isn't affected too as we already found.)
So you can disable fast startup to solve this issue.
The short version:
I have written a small program to print a report. This program is exec'ed from our proprietary server, that is running as a windows service. It works in our development environment, but not on our customer's network.
When I attempt to access the printing system in the failing case, I get a "No default printer" error. We had the customer create a new login account that has a default printer defined, and restarted the server using that login account. Same error.
Note that this error is generated when trying to find a specified printer, not when we try to print to it.
Is there any way to convince a server-spawned process that printers do, in fact, exist?
The long version:
In our "current" production environment, we have the following:
1. a proprietary server that runs as a service under windows.
2. a desktop client
--> accesses data via that service
--> uses fastreport4 to generate reports
--> developed using C++Builder6 (and VCL)
3. a PocketPC-based application that runs on scanning devices
--> uses Apache to communicate with the service
--> also uses Apache to poke a cgi-bin application that will bring up
the desktop app in stealth mode, run a report, and print it.
I have been tasked with re-implementing the Pocket-PC functionality on an Android-based scanning device, and removing the Apache layer from the architecture. In the Android app, I've written a communication layer to access the server (service) directly (the same way the desktop does). The server has the ability to exec applications, so I've written a small one to just gather data, and call fastreport to format and print it.
Works great. No problem. ... in our development environment. It works in our office network with the server running on a Windows 7 system. It works when run from the command line on our customer's Windows 2008 server. It does not work when run from the service on the customer's server.
So here's the code. In my current revision, I have try/catch and debug print statements around (nearly) every line of code. I removed them for readability.
bool __fastcall TFormReportRunner::mySetPrinter(const char* name)
{
char pDevice[MAX_PATH];
char pDriver[MAX_PATH];
char APort[100];
UINT ADeviceMode;
bool printerFound = false;
bool errorFound = false;
String PrinterPort = String(name).UpperCase();
TPrinter* Prntr;
// I added this bit to see if it helps. Seems to make no difference
bool rc = SetDefaultPrinter("");
Prntr = Printer();
if (Prntr == NULL)
{
LogErrorMsg("Printer() returned null.");
return false;
}
int i = Prntr->Printers->Count - 1;
for (; i >= 0; i--)
{
// In the failing case, this next statement is the one that causes an exception.
Prntr->PrinterIndex = i;
Prntr->GetPrinter(pDevice, pDriver, APort, ADeviceMode);
DWORD SizeNeeded = 0;
HANDLE PrinterHandle;
if (OpenPrinter(pDevice, &PrinterHandle, NULL) == 0)
{
LogErrorMsg("Could not open printer");
return false;
}
GetPrinter(PrinterHandle, 2, NULL, 0, &SizeNeeded);
if (SizeNeeded == 0)
{
ClosePrinter(PrinterHandle);
LogErrorMsg("Could not retrieve printer info size");
return false;
}
PRINTER_INFO_2 PrinterInfo2;
char* buffer = new char[SizeNeeded];
if (GetPrinter(PrinterHandle, 2, buffer, SizeNeeded, &SizeNeeded) == 0)
{
ClosePrinter(PrinterHandle);
delete [] buffer;
LogErrorMsg("Could not retrieve printer info");
return false;
}
String PortName = ((PRINTER_INFO_2*)buffer)->pPortName;
delete [] buffer;
ClosePrinter(PrinterHandle);
if (PrinterPort == PortName)
{
frxReport1->PrintOptions->Printer = pDevice;
break;
}
}
Prntr->PrinterIndex = i;
return true;
}
One of the customer's IT guys says that in order to have the Apache version work they have to run Apache as administrator with a defined default printer AND have that admin account logged in for printing to work. He suspects that if we run our service in the same configuration it will start to work. I have not been able to replicate that on our network. My admin account always works, whether anyone is currently logged into the system, or not. But this is Windows 7/Professional, and not a server version.
This has got to be possible... Apache's doing it. If it can find a printer and print to it, I should be able to, right?
Any hints or help will be greatly appreciated. Anything. Really. :)
Thanks,
-Karen
Edit: Adding server-side code.
A couple of notes, first. One, this was written 20-ish years ago (by someone else). Two, it is NOT a VCL app (and was compiled with the Microsoft compiler). Three, we will not change it. Recompiling with current compilers is WAY too risky for something that is otherwise working.
int myServer::RunProcess2(ClientCall *call, vector<string> &args, vector<string> &env, const char* input, unsigned int insize,
string *output, string *error)
{
CancelProcess2(); // only one process allowed per connection
string cmdline;
for (unsigned int i = 0; i < args.size(); i++)
{
if (i != 0)
cmdline += ' ';
cmdline += args[i];
}
env.push_back(EnvPATH);
int size = 1;
for (unsigned int i = 0; i < env.size(); i++)
{
size += env[i].size() + 1;
}
char *environment = (char*)malloc(size);
if (environment == NULL)
{
call->error = "Could not allocate memory for process environment variables";
return 0;
}
char *ptr = environment;
for (unsigned int i = 0; i < env.size(); i++)
{
size = env[i].size() + 1;
memcpy(ptr, env[i].c_str(), size);
ptr += size;
}
ptr[0] = '\0';
HANDLE hInputReadPipe = NULL, hInputWritePipe = NULL;
HANDLE hReadPipe, hWritePipe;
HANDLE hErrorReadPipe, hErrorWritePipe;
SECURITY_ATTRIBUTES sa;
sa.nLength = sizeof(sa);
sa.lpSecurityDescriptor = NULL;
sa.bInheritHandle = true;
// create output pipe
if (CreatePipe(&hReadPipe, &hWritePipe, &sa, 4096) == 0)
{
free(environment);
call->error = "Error creation Pipe";
return 0;
}
// create error pipe
if (CreatePipe(&hErrorReadPipe, &hErrorWritePipe, &sa, 4096) == 0)
{
CloseHandle(hReadPipe);
CloseHandle(hWritePipe);
free(environment);
call->error = "Error creating Pipe";
return 0;
}
if (insize > 0)
{
// create input pipe
if (CreatePipe(&hInputReadPipe, &hInputWritePipe, &sa, 4096) == 0)
{
CloseHandle(hReadPipe);
CloseHandle(hWritePipe);
CloseHandle(hErrorReadPipe);
CloseHandle(hErrorWritePipe);
free(environment);
call->error = "Error creating Pipe";
return 0;
}
}
STARTUPINFO si;
memset(&si, 0, sizeof(si));
si.cb = sizeof(si);
si.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
si.wShowWindow = SW_HIDE;
si.hStdOutput = hWritePipe;
si.hStdError = hErrorWritePipe;
si.hStdInput = hInputReadPipe;
PROCESS_INFORMATION pi;
if (CreateProcess(NULL, (char*)cmdline.c_str(), NULL, NULL, true, 0, environment, NULL, &si, &pi) == 0)
{
CloseHandle(hErrorReadPipe);
CloseHandle(hErrorWritePipe);
CloseHandle(hReadPipe);
CloseHandle(hWritePipe);
if (hInputReadPipe != NULL)
{
CloseHandle(hInputReadPipe);
CloseHandle(hInputWritePipe);
}
free(environment);
call->error = string("Error executing command: ") + cmdline + "\n" + GetErrorText();
return 0;
}
report_handle = pi.hProcess;
CloseHandle(hErrorWritePipe);
CloseHandle(hWritePipe);
if (hErrorReadPipe != NULL)
CloseHandle(hInputReadPipe);
char buffer[4097];
DWORD BytesAvail;
DWORD BytesRead = 0;
DWORD BytesWritten = 0;
DWORD BytesToRead = sizeof(buffer) - 1;
DWORD BytesToWrite = insize;
bool finished_readpipe = false, finished_errorpipe = false;
bool finished_inputpipe = (insize == 0);
int wait_time = 1;
bool error_occurred = false;
while (finished_readpipe == false || finished_errorpipe == false || finished_inputpipe == false)
{
if (finished_inputpipe == false)
{
if (BytesToWrite <= 0)
{
CloseHandle(hInputWritePipe);
hInputWritePipe = NULL;
finished_inputpipe = true;
continue;
}
BytesAvail = 1000;
/*if (PeekNamedPipe(hInputWritePipe, NULL, NULL, NULL, &BytesAvail, NULL) == 0)
{
DWORD temp = GetLastError();
// pipe has been closed
finished_inputpipe = true;
continue;
}*/
if (BytesAvail > 0)
{
if (BytesAvail > BytesToWrite)
BytesAvail = BytesToWrite;
if (WriteFile(hInputWritePipe, input, BytesAvail, &BytesWritten, NULL) == 0)
{
if (GetLastError() == ERROR_NO_DATA)
{
int a = 2; // Pipe was closed (normal exit path).
}
finished_inputpipe = true;
continue;
}
input += BytesWritten;
BytesToWrite -= BytesWritten;
if (BytesToWrite == 0)
{
finished_inputpipe = true;
}
continue;
}
}
if (finished_readpipe == false)
{
while (true)
{
if (PeekNamedPipe(hReadPipe, NULL, NULL, NULL, &BytesAvail, NULL) == 0)
{
// pipe has been closed
finished_readpipe = true;
break;
}
if (BytesAvail <= 0)
break;
if (BytesAvail > sizeof(buffer) - 1)
BytesAvail = sizeof(buffer) - 1;
if (ReadFile(hReadPipe, buffer, BytesAvail, &BytesRead, NULL) == 0)
{
finished_readpipe = true;
break;
}
if (BytesRead == 0)
{
finished_readpipe = true;
break;
}
buffer[BytesRead] = '\0';
*output += buffer;
if (output->length() >= MAX_PROCESS_OUTPUT)
{
finished_inputpipe = true;
finished_readpipe = true;
finished_errorpipe = true;
error_occurred = true;
call->error = "Output limit reached";
}
}
if (finished_readpipe == true)
continue;
}
if (finished_errorpipe == false)
{
while (true)
{
if (PeekNamedPipe(hErrorReadPipe, NULL, NULL, NULL, &BytesAvail, NULL) == 0)
{
// pipe has been closed
finished_errorpipe = true;
break;
}
if (BytesAvail <= 0)
break;
if (BytesAvail > sizeof(buffer) - 1)
BytesAvail = sizeof(buffer) - 1;
if (ReadFile(hErrorReadPipe, buffer, BytesAvail, &BytesRead, NULL) == 0)
{
finished_errorpipe = true;
break;
}
if (BytesRead == 0)
{
finished_errorpipe = true;
break;
}
buffer[BytesRead] = '\0';
*error += buffer;
if (error->length() >= MAX_PROCESS_OUTPUT)
{
finished_inputpipe = true;
finished_readpipe = true;
finished_errorpipe = true;
error_occurred = true;
call->error = "Error output limit reached";
}
}
if (finished_errorpipe == true)
continue;
}
// don't tie up the server
if (wait_time < 100)
wait_time++;
Sleep(wait_time);
}
if (error_occurred == false)
WaitForSingleObject(pi.hProcess, INFINITE);
process_mutex.lock();
report_handle = NULL;
process_mutex.unlock();
DWORD exit_code = 0;
GetExitCodeProcess(pi.hProcess, &exit_code);
CloseHandle(pi.hThread);
CloseHandle(pi.hProcess);
CloseHandle(hReadPipe);
CloseHandle(hErrorReadPipe);
if (hInputWritePipe != NULL)
CloseHandle(hInputWritePipe);
free(environment);
return exit_code;
}
I'm trying to inject my DLL into a 64-bit process that I just created. I initially create it suspended so that I can apply WinAPI patch trampolines in that process (from my injected DLL.) But if I understand it correctly, I cannot inject my DLL into a suspended process.
So I came up with the following code, following the guy's suggestions, but it doesn't go far. The VirtualProtectEx fails and I get an error code ERROR_INVALID_ADDRESS. I marked it in the source below.
Any idea where am I messing up?
PROCESS_INFORMATION pi = {0};
STARTUPINFO si = {0};
si.cb = sizeof(si);
WCHAR buffer[MAX_PATH];
::StringCchCopy(buffer, _countof(buffer), L"injected-process.exe");
if(CreateProcessW(0, buffer, 0, 0, 0, CREATE_SUSPENDED, 0, 0, &si, &pi))
{
inject_dll_into_suspended_x64_proc(pi.hProcess, pi.hThread, "injected-process.exe");
//... continue on
}
and then the code to prep process for injection:
bool inject_dll_into_suspended_x64_proc(HANDLE hProc, HANDLE hMainThread, const char* pstrProcFileName)
{
bool bRes = false;
int nOSError = NO_ERROR;
DWORD dwEntryOffset = 0;
LOADED_IMAGE li = { 0 };
if (::MapAndLoad(pstrProcFileName, NULL, &li, FALSE, TRUE))
{
dwEntryOffset = li.FileHeader->OptionalHeader.AddressOfEntryPoint;
::UnMapAndLoad(&li);
}
if(dwEntryOffset)
{
// 90 nop
// EB FE jmp self
static BYTE inject_asm_x64[] = {
0x90,
0xEB, 0xFE,
};
BYTE buffBackup[sizeof(inject_asm_x64)] = { 0 };
//Get process base addr
BYTE* pBaseAddr = (BYTE*)::VirtualAllocEx(hProc, NULL, sizeof(buffBackup), MEM_COMMIT, PAGE_EXECUTE_READWRITE);
if (pBaseAddr)
{
BYTE* pAddr = pBaseAddr + dwEntryOffset;
DWORD dwOldProtect = 0;
if (::VirtualProtectEx(hProc, pAddr, sizeof(buffBackup), PAGE_EXECUTE_READWRITE, &dwOldProtect)) //** FAILS: With error code: 487, or ERROR_INVALID_ADDRESS
{
__try
{
//Backup what we have there now
size_t szcbRead = 0;
if (::ReadProcessMemory(hProc, pAddr, buffBackup, sizeof(buffBackup), &szcbRead) &&
szcbRead == sizeof(buffBackup))
{
//Now write our code into entry point
size_t dwcbSzWrtn = 0;
if (WriteProcessMemory(hProc, pAddr, inject_asm_x64, sizeof(inject_asm_x64), &dwcbSzWrtn) &&
dwcbSzWrtn == sizeof(inject_asm_x64))
{
bool bIntermediateSuccess = false;
bool bThreadIsSuspended = true;
//Resume thread
if (ResumeThread(hMainThread) == 1)
{
bThreadIsSuspended = false;
CONTEXT context;
bool bReached = false;
//Wait for it to reach our JMP self opcode
for(;; ::Sleep(1))
{
if(!::GetThreadContext(hMainThread, &context))
{
//Failed
nOSError = ::GetLastError();
break;
}
if(context.Rip == (DWORD64)(pAddr + 1)) //First is nop, so skip it
{
//Got it
bReached = true;
break;
}
}
if(bReached)
{
//Do our DLL injection now
if(inject_dll_here(hProc))
{
//Injected OK
bIntermediateSuccess = true;
}
else
nOSError = ::GetLastError();
//Suspend main thread
if(::SuspendThread(hMainThread) == 0)
{
//Thread is again suspended
bThreadIsSuspended = true;
}
else
{
//Failed
nOSError = ::GetLastError();
bIntermediateSuccess = false;
}
}
}
else
nOSError = ::GetLastError();
if(bThreadIsSuspended)
{
//Revert process memory back
if (WriteProcessMemory(hProc, pAddr, buffBackup, sizeof(buffBackup), &dwcbSzWrtn) &&
dwcbSzWrtn == sizeof(buffBackup))
{
//Now restore the main thread
if (ResumeThread(hMainThread) == 1)
{
//Done
bRes = bIntermediateSuccess;
}
else
nOSError = ::GetLastError();
}
else
nOSError = ::GetLastError();
}
}
else
nOSError = ::GetLastError();
}
else
nOSError = ::GetLastError();
}
__finally
{
//Reset protection flags
::VirtualProtectEx(hProc, pAddr, sizeof(buffBackup), dwOldProtect, NULL);
}
}
else
nOSError = ::GetLastError();
//Free mem
::VirtualFreeEx(hProc, pBaseAddr, 0, MEM_RELEASE);
}
else
nOSError = ::GetLastError();
}
else
nOSError = ::GetLastError();
return bRes;
}
Pipe is being used, If server call WriteFile/ReadFile, client have to call ReadFile/WriteFile for synchronize each other.I implemented it like this.
Example :
**COMMON : **
BOOL RecvData(DWORD &dwScore)
{
DWORD dwRead = 0;
if(0 == ReadFile(g_hPipe, &dwScore, sizeof(DWORD), &dwRead, 0))
return FALSE;
if (sizeof(DWORD) != dwRead)
return FALSE;
return TRUE;
}
BOOL SendData(DWORD dwScore)
{
DWORD dwSend = 0;
if(0 == WriteFile(g_hPipe, &dwScore, sizeof(DWORD), &dwSend, 0))
return FALSE;
if (sizeof(DWORD) != dwSend)
return FALSE;
return TRUE;
}
**SERVER : **
VOID StartServerManager()
{
DWORD dwScore = 0;
while (TRUE)
{
if(FALSE == RecvData(dwScore))
continue;
//.... do something dwScore + dwSkill ...
if(FALSE == SendData(dwScore))
continue;
}
}
**CLIENT : **
#define VILLA_READ_MODE 0xDEDC
#define VILLA_WRITE_MODE 0xCDEC
VOID StartClientManager()
{
DWORD dwScore = 4;
DWORD dwMode = VILLA_WRITE_MODE;
while(TRUE)
{
switch(dwMode)
{
case VILLA_WRITE_MODE:
SendData(dwScore);
dwMode = VILLA_READ_MODE;
break;
case VILLA_READ_MODE:
RecvData(dwScore);
dwMode = VILLA_WRITE_MODE;
break;
}
}
}
If I change StartServerManager() into like this
VOID StartServerManager()
{
DWORD dwScore = 0;
while (TRUE)
{
if(FALSE == RecvData(dwScore))
continue;
//.... do something dwScore + dwSkill ...
if(FALSE == SendData(dwScore))
continue;
if(FALSE == RecvData(dwScore))
continue;
if(FALSE == RecvData(dwScore))
continue;
}
}
Function will block at ReadFile()
if(0 == ReadFile(g_hPipe, &dwScore, sizeof(DWORD), &dwRead, 0))
BOOL RecvData(DWORD &dwScore)
{
DWORD dwRead = 0;
if(0 == ReadFile(g_hPipe, &dwScore, sizeof(DWORD), &dwRead, 0))
return FALSE;
if (sizeof(DWORD) != dwRead)
return FALSE;
return TRUE;
}
Implemented with threads, too.
Is there any method pass block on ReadFile?
I thought about this...
#define VILLA_READ_MODE 0xDEDC
#define VILLA_WRITE_MODE 0xCDEC
VOID StartClientManager()
{
HANDLE hThread[2];
DWORD dwModeRead = VILLA_READ_MODE;
DWORD dwModeWrite = VILLA_WRITE_MODE;
hThread[1] = CreateThread(NULL, 0, SYNCTHREAD, &dwModeRead, 0, 0);
hThread[2] = CreateThread(NULL, 0, SYNCTHREAD, &dwModeWrite, 0, 0);
WaitForMultipleObjects(2, hThread, TRUE, INFINITE);
}
DWORD WINAPI SYNCTHREAD(DWORD &dwMode)
{
switch (dwMode)
{
case VILLA_READ_MODE:
RecvData(dwScore);
break;
case VILLA_WRITE_MODE:
SendData(dwScore);
break;
}
}
I am trying jni interfacing for serial port programming, using Microsoft Visual Studio 11 with .NET 4.0.
I get he following error when I try to read from the comm port:
time out happened in PortRead()
The read time out value is set to 5sec.
The following is a part of the code:
Also, since my laptop is 64 bit I'm using a bafo ie a 64 to 32 bit converter, and then attach the rs232 wire.
JNIEXPORT jint JNICALL Java_JavaSerial_Read(JNIEnv *env, jobject obj)
{
jint idata = 0;
char cdata[8];
ERR_CODE rc = OK;
CommPortClass* commClass;
commClass = new CommPortClass;
commClass->iMaxChars = 1;
rc = PortRead(commClass);
if (rc != OK)
Msg("ERROR in PortRead()! ");
sprintf_s(cdata, "%d", commClass->pcBuffer[0]);
idata = atoi(cdata);
delete commClass;
return idata;
}
//Port read function
ERR_CODE PortRead(CommPortClass *hCommPort)
{
HANDLE hThread; // handler for port read thread
DWORD IDThread;
DWORD Ret, ExitCode;
DWORD dTimeout = 5000; // define time out value: 5 sec.
ERR_CODE ecStatus = OK;
if (!(hThread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE) ThreadFunc, (LPVOID)hCommPort, CREATE_SUSPENDED, &IDThread) ) )
// no security attributes, use default stack size, parameter to thread function, creation flag - suspended, returns thread ID
{
Msg("Create Read Thread failed");
return EC_CREATE_THREAD;
}
ResumeThread(hThread); // start thread now
Ret = WaitForSingleObject(hThread, dTimeout);
if (Ret == WAIT_OBJECT_0)
{
// Data received & process it... need to do nothing because the data is stored in the
// hCommPort in the Thread Function. The only thing is to close thread handle
CloseHandle(hThread);
}
else if (Ret == WAIT_TIMEOUT) // Time out happened
{
// Warning & kill thread
Ret = GetExitCodeThread(hThread, &ExitCode);
Msg("Time out happened in PortRead() ");
if (ExitCode == STILL_ACTIVE)
{
TerminateThread(hThread, ExitCode);
CloseHandle(hThread);
return EC_RECV_TIMEOUT;
}
else
{
CloseHandle(hThread);
Msg("ERROR in GetExitCodeThread: != STILL_ACTIVE ");
ecStatus = EC_EXIT_CODE;
}
}
else
{
Msg("ERROR in WaitFor SingleObject ");
ecStatus = EC_WAIT_SINGLEOBJ;
}
return ecStatus;
}
//Thread() function
void WINAPI ThreadFunc(void* hCommPorts)
{
char Byte;
BOOL bResult, fDone;
int nTotRead = 0;
DWORD dwCommModemStatus, dwBytesTransferred;
CommPortClass* CommPorts;
ERR_CODE ecStatus = OK;
CommPorts = (CommPortClass* )hCommPorts;
// Specify a set of events to be monitored for the port.
SetCommMask(hPort, EV_RXCHAR | EV_CTS | EV_DSR | EV_RLSD | EV_RING);
fDone = FALSE;
while (!fDone)
{
// Wait for an event to occur for the port.
WaitCommEvent(hPort, &dwCommModemStatus, 0);
// Re-specify the set of events to be monitored for the port.
SetCommMask(hPort, EV_RXCHAR | EV_CTS | EV_DSR |EV_RLSD| EV_RING);
if (dwCommModemStatus & EV_RXCHAR||dwCommModemStatus & EV_RLSD)
{
// received the char_event & loop to wait for the data.
do
{
// Read the data from the serial port.
bResult = ReadFile(hPort, &Byte, 1, &dwBytesTransferred, 0);
if (!bResult)
{
Msg("ERROR in ReadFile !");
fDone = TRUE;
break;
}
else
{
// Display the data read.
if (dwBytesTransferred == 1)
{
CommPorts->pcBuffer[nTotRead] = Byte;
nTotRead++;
if (nTotRead == CommPorts->iMaxChars)
{
fDone = TRUE;
break;
}
}
else
{
if (Byte == 0x0D ||Byte == 0x0A) // null char or CR
{
Msg("Received null character ");
fDone = TRUE;
break;
}
}
}
} while (dwBytesTransferred == 1); //while (nTotRead < pRecv->iMaxChars);
} // if
} // while
return;
}