I am trying to detect the presence of an UPS(Eaton)from my application in RAD Studio C++. I tried using the SYSTEM_POWER_CAPABILITIES (MSDN) but I always get the answer that the "UPS not found" even though the UPS is connected and works fine. Is there any other way to detect if the UPS is present and if it is ON?
int tmain()
{
SYSTEM_POWER_CAPABILITIES SysPowCap = {0};
if(!::GetPwrCapabilities(&SysPowCap))
{
ShowMessage(GetLastError());
return 0;
}
if(SysPowCap.UpsPresent)
ShowMessage("UPS found");
else
ShowMessage("UPS not found");
return 0;
}
Related
I'm writing a server for an online game based on IOCP, and the core codes handling game message is something like below:
CMessage ret;
int now_roomnum = recv_msg->para1;
int now_playernum = recv_msg->para2;
/*if(true)
{
cout<<"Received Game Message: "<<endl;
cout<<"type2 = "<<recv_msg->type2;
cout<<" player_num = "<<now_playernum<<" msg= "<<recv_msg->msg<<endl;
cout<<endl;
}*/
if(recv_msg->type2 == MSG_GAME_OPERATION)
{
ret.type1 = MSG_GAME;
ret.type2 = MSG_GAME_OPERATION;
while(game_host[now_roomnum].Ready(now_playernum) == true)
{
;
}
//cout<<"Entered from "<<now_playernum<<endl;
game_host[now_roomnum].SetMessage(now_playernum, recv_msg->msg);
game_host[now_roomnum].SetReady(now_playernum, true);
game_host[now_roomnum].SetUsed(now_playernum, false);
while(true)
{
bool tmp = game_host[now_roomnum].AllReady();
if(tmp == true)
break;
}
//cout<<"AllReady from"<<now_playernum<<endl;
string all_msg = game_host[now_roomnum].GetAllMessage();
game_host[now_roomnum].SetUsed(now_playernum, true);
while(!game_host[now_roomnum].AllUsed())
{
;
}
//cout<<"AllUsed from "<<now_playernum<<endl;
EnterCriticalSection(&cs);
game_host[now_roomnum].ClearReady();
LeaveCriticalSection(&cs);
strcpy_s(ret.msg, all_msg.c_str());
//cout<<"Return msg "<<now_playernum<<": "<<ret.msg<<endl;
}
return ret;
Now, the problem is: on a PC, when all cout are commented like above, the game freezes at once; but when I cancel the comments, the server works well.
What's more, when I run the server on my laptop, everything goes fine, no matter whether I comment the cout or not. The main difference between my laptop and PC is that my laptop's OS is Windows 8.1, while the PC is Windows 7.
I'm totally confused. It will be of great help if someone can tell me what to do. Thank you!
Looks like a multithreading issue.
By the way I see you use a Critical section around ClearReady but not when testing for AllReady. That call should be wrapped as well (or, better, write a LockedAllReady that makes use of the lock).
//cout<<"Return msg "<<now_playernum<<": "<<ret.msg<<endl;
What you mean by ret.msg? if msg is method you must do ret.msg(); , is it a field?
If you have this good then like they say above probably a timing problem, try to do cout without ret.msg and see what will happen, and then you know from where the problem is.
I'm creating a webrtc-based voip app for windows in C++. I'm trying to initialize a peerconnection. I'm stuck at the part to fetch a camera. I'm using the following code to find a camera to start streaming media from (copied from the peerconnection client example):
rtc::scoped_ptr<cricket::DeviceManagerInterface> dev_manager(cricket::DeviceManagerFactory::Create());
if (!dev_manager->Init()) {
LOG(LS_ERROR) << "Can't create device manager";
return NULL;
}
std::vector<cricket::Device> devs;
if (!dev_manager->GetVideoCaptureDevices(&devs)) {
LOG(LS_ERROR) << "Can't enumerate video devices";
return NULL;
}
std::vector<cricket::Device>::iterator dev_it = devs.begin();
cricket::VideoCapturer* capturer = NULL;
for (; dev_it != devs.end(); ++dev_it) {
capturer = dev_manager->CreateVideoCapturer(*dev_it);
if (capturer != NULL)
break;
}
capturer is empty after this procedure. I stepped through the code to see what was wrong. dev_manager is succesfully intialized, devs gets a single entry (my webcam) with a name:
"logitech HD webcam c270"
And an id:
"\\\\?\\usb#vid_046d&pid_0825&mi_00#7&2dbd1a82&1&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\\{bbefb6c7-2fc4-4139-bb8b-a58bba724083}"
But after the CreateVideoCapturer() call, capturer is still empty. I get a warning in the console saying:
Warning(webrtcvideocapturer.cc:175): Failed to find capturer for id: \\?\usb#vid_046d&pid_0825&mi_00#7&2dbd1a82&1&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\{bbefb6c7-2fc4-4139-bb8b-a58bba724083}
I checked if the id I get in devs and this one match and they do. The entire log for my app can be found in this pastebin. As you can see, right after trying to assign the camera as capturer and failing, the app crashes on an assert(capturer != NULL) call somewhere in videosource.cc.
The camera is not in use, nor is it defect. The peerconnection client example works perfectly and uses the same code. I think I'm missing some step in the initialization of webrtc, but I can't find which step.
edit with additional info
I'm debug stepping through the library now. In webrtcvideocapturer.cc around line 160 is the following code:
int num_cams = info->NumberOfDevices();
char vcm_id[256] = "";
bool found = false;
for (int index = 0; index < num_cams; ++index) {
char vcm_name[256];
int32 i = info->GetDeviceName(index, vcm_name, ARRAY_SIZE(vcm_name), vcm_id, ARRAY_SIZE(vcm_id));
if (i != -1) {
if (device.name == reinterpret_cast<char*>(vcm_name)) {
found = true;
break;
}
}
}
if (!found) {
LOG(LS_WARNING) << "Failed to find capturer for id: " << device.id;
factory_->DestroyDeviceInfo(info);
return false;
}
There are two problems with this part. First of all, if I step into info->NumberOfDevices() it shows me that that function's only content is the line return 0;. I tried hard-coding 1 there, to at least get into the for loop. Then when I step into the info->GetDeviceName() call it shows me that the content of that function is return -1;.
These two functions are meant to be implemented by a class that inherits from webrtc::VideoCaptureModule::DeviceInfo, so there is clearly something not initialized that does needs to be initialized. What do I still need to do before trying to get a camera?
What libraries did you link?
Because Google WebRTC source codes are changing rapidly, it is difficult to track down issues to the source level.
But I remember the almost same problem occurred when I accidentally linked external capture module library (video_capture_module_impl ??) or (I'm not sure) omitted internal impl (video_capture_module_internal_impl ??).
I am trying to temporarily install a font to use in the win32 console with
int AddFontResource(LPCTSTR lpszFilename);
and
BOOL WINAPI SetConsoleFont(HANDLE hOutput, DWORD fontIndex)
I got hold of this function from this site.
Although both functions seem to work fine I have no idea how to find the added font index to use with SetConsoleFont.
AddFontResource returns no index value or key to the temporary font.
Here is my relevant code:
#include "Level.h"
#include "ConsoleFont.h" //acquired from above mentioned site
#include <Windows.h>
//-------------------------------------------------------------------------------
void init();
void cleanup();
int main()
{
FileManager *pFileManager = new FileManager(); //unrelated
Level *lvl1 = new Level("filename",pFileManager); //unrelated
///TEMPORARY PLANNING
// using add font resource. how can i get this fonts index value?
int err = AddFontResource(L"Files/gamefont.fnt");
if (err == 0)
{
MessageBox(NULL,L"loading font failed",L"Error",0);
}
else
{
wchar_t message[100];
swprintf_s(message,100,L"AddFontResource returned: %d",err);
MessageBox(NULL,LPTSTR(message),L"error",0);
}
SendMessage(HWND_BROADCAST, WM_FONTCHANGE,0,0);
//acquiring handle to current active screen buffer
HANDLE tempHandle = GetStdHandle(STD_OUTPUT_HANDLE);
if (tempHandle == INVALID_HANDLE_VALUE)
{
MessageBox(NULL,L"Failed to aquire Screen Buffer handle",L"Error",0);
}
//I dont know what to set this to. this is the crux of the problem.
DWORD fontIndex = 1;
if (FALSE == SetConsoleFont(tempHandle,fontIndex))
{
MessageBox(NULL,L"loading console font failed",L"Error",0);
}
//draws a house when in correct font
std::cout<<"!!!!!!!!#\n"
<<"!!!!!!!!!\n"
<<"! !! !! !\n"
<<"!!!!!!!!!\n"
<<"! !! !! !\n"
<<"!!!!!!!!!\n"
<<"! !! !! !\n"
<<"!!!!!!!!!\n"
<<"! !! !! !#\n"
<<"!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"<<std::endl;
///PLANNING OVERS
bool quit = false;
while(!quit)
{
//still to be implemented
}
err = RemoveFontResource(L"Files/gamefont.fnt");
if (err==0)
{
MessageBox(NULL,L"removing font failed",L"Error",0);
}
return 0;
}
I don't know how to go about finding my new font's index value or even if this is possible using my current method.
If someone knows or has a better method please help me out.
any help or hints are appreciated. It must possible to use a custom font in the win32 Console without fiddling with the registry. I'm sure of it :)
Unfortunately you entered the dark world on Win APIs. There is no documentation (or atleast I could never find it) for a console font table lookup. You can try the method "GetNumberOfConsoleFonts()" to see what is returned. I think the font at index 10 is Lucida Console. You'll have to play around a little. Also, this may not work for the OS version you have. Worked for me on XP. Never had to try on anything else. And honestly, never got it fully working on XP too.
For the registry,
Fonts registries are here:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Fonts
Console registries are here:
HKEY_CURRENT_USER\Console
If you end up modifying the registry, the changes may not be reflected immediately. You need to either restart the console or send a special WM_* message (sorry don't remember the name).
Will be great if you can find a solution/workaround :)
int err = AddFontResource(L"Files/gamefont.fnt");
if (err == 0)
{
MessageBox(NULL,L"loading font failed",L"Error",0);
}
else
{
wchar_t message[100];
swprintf_s(message,100,L"AddFontResource returned: %d",err);
MessageBox(NULL,LPTSTR(message),L"error",0);
}
this is wrong AddFontResource returns the number of fonts loaded, so the code in the ELSE doesn't make sense.
I have the following C++ code and when I run the program sometimes it works and sometimes it does not!
I think the problem occurs when I try to open the serial port while there is data left to be read.
Sometimes after running this program, it makes Windows XP restart unexpectedly! It does not Blue Screen, it justs restarts.
I am using Visual Studio 2010 to compile it.
main()
{
while(0) { // BIG FAT WARNING: MIGHT SUDDEN REBOOT YOUR MACHINE IF ENABLED
read_from_serial(_data);
}
}
bool read_from_serial(octed_string &_data)
{
HANDLE hSerial;
hSerial = CreateFile(TEXT("COM2"),
GENERIC_READ|GENERIC_WRITE,0,0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,0);
if (hSerial == INVALID_HANDLE_VALUE)
{
if (GetLastError() == ERROR_FILE_NOT_FOUND)
{
cout << "1:";
return false;
//serialportdoesnotexist.Informuser.
}
cout << "2:";
return false;
//someothererroroccurred.Informuser.
}
DCB dcbSerialParams = {0};
dcbSerialParams.DCBlength=sizeof(dcbSerialParams);
if(!GetCommState(hSerial,&dcbSerialParams))
{
cout<<"3:";
return false;
//errorgettingstate
}
dcbSerialParams.BaudRate=CBR_9600;
dcbSerialParams.ByteSize=7;
dcbSerialParams.StopBits=ONESTOPBIT;
dcbSerialParams.Parity=EVENPARITY;
if (!SetCommState(hSerial,&dcbSerialParams))
{
cout<<"4:";
return false;
//errorsettingserialportstate
}
COMMTIMEOUTS timeouts={0};
timeouts.ReadIntervalTimeout=50;
timeouts.ReadTotalTimeoutConstant=10;
timeouts.ReadTotalTimeoutMultiplier=10;
timeouts.WriteTotalTimeoutConstant=50;
timeouts.WriteTotalTimeoutMultiplier=10;
if (!SetCommTimeouts(hSerial,&timeouts))
{
cout<<"5:";
return false;
//erroroccureed.Informuser
}
const int n=1;
DWORD dwBytesRead=0;
char_t tmp_receive[255]={0};
char_t buff[255];
int len=255;
if (!ReadFile(hSerial,tmp_receive,len,&dwBytesRead,NULL))
{
cout<<"6:";
CloseHandle(hSerial);
return false;
}
CloseHandle(hSerial);
tmp_receive[dwBytesRead+1]=END_OF_STRING;
string tmp_buff_str=tmp_receive;
_data.append(tmp_buff_str);
return true;
}
Cause
I have a suspicion that your program is crashing on this line
tmp_receive[dwBytesRead+1]=END_OF_STRING;
You defined the tmp_receive array with 255 elements, which makes the possible indexes 0 to 254. You then initialized len to 255. If there are 255 bytes available to read on the call to ReadFile(...), then dwBytesRead will be equal to 255 and the line I mentioned above will effectively be as follows, and would mean you're attempting to write to memory outside of the scope of the tmp_receive array.
tmp_receive[256] = END_OF_STRING;
As for the rebooting, I don't know for sure, but maybe your program is causing a system crash when it attempts to write to invalid memory and you have Windows XP configured to reboot instead of displaying a BSOD.
Solutions
In order to keep your program from crashing I see that you have 2 options. I can't say which one is better since I don't know what the format of the data you're expecting to receive is, so you will have to analyize the outcomes of each option and decide for yourself.
Option #1
Use an element count of 257 when defining the tmp_receive array.
Option #2
Subtract 2 from len when making the call to ReadFile(...)
if (!ReadFile(hSerial,tmp_receive,len-2,&dwBytesRead,NULL))
Additional Information
Have a look at the MSDN documentation on ReadFile(...) for more information on the behaviour of the ReadFile(...) Windows API.
If you would like to learn more about how strings are stored in memory, I would suggest having a look at the Character Sequences article on www.cplusplus.com.
In my code I try to get the permissions for a file with _stat(). Currently I want to run it under Windows. The method is as follows:
bool CFile::Private::checkPermissions(std::string sFilename, CFile::EOpenmode iOpenmode)
{
std::string sErrMsg = "";
bool bResult = true;
struct _stat buf;
int iResult = 0;
// Get data associated with "crt_stat.c":
iResult = _stat( sFilename.c_str(), &buf );
// Check if statistics are valid:
if( iResult != 0 )
{
switch (errno)
{
case ENOENT:
sErrMsg = "File: " + sFilename + " not found.";
break;
case EINVAL:
sErrMsg = "Invalid parameter to _stat(filename, &buf).";
break;
default:
/* Should never be reached. */
sErrMsg = "Unexpected error in _stat(filename, &buf).";
}
throw std::runtime_error(sErrMsg);
}
else
{
if((iOpenmode & CFile::Read) && (!(buf.st_mode & S_IREAD)))
{
bResult = false;
}
if((iOpenmode & CFile::Write) && (!(buf.st_mode & S_IWRITE)))
{
bResult = false;
}
}
return bResult;
}
The only way to get 'false' for permission is to set the file's attribute 'read only'. Instead of this, set the security properties of the user (reject writing and reading) will get 'true' for checkPermissions(...). How to check both, the attributes and the user permissions for Windows?
Rumo
_stat is a function that is not native to Windows. It's a helper function to ease the porting of UNIX programs to Windows. But the UNIX file model just doesn't apply to Windows, so not all fields make sense. For instance, Windows has real ACL's, not rwx bits. There's just no way to fit all the ACL information in st_mode.
If you want to test ACL permissions, the proper way is to just try: call CreateFile() and check GetLastError(). Trying to get file permissions up front is not reliable as they can change at any time.
If we're talking about the same _stat() it's pretty clear from this MSDN article exactly what it does. Basically, you supply it a path to a file in question and a pointer to a _stat struct and it will dump the permissions to the struct if it returns 0.
The example C++ code in the article is pretty good.
As for testing user permissions, IsUserAnAdmin() does the job pretty well. You may be able to use this MSDN article for a different approach.
I hope this helps!