I am trying to make my webcam Win32 application save more than one photo at a time i.e. save one photo then another then another etc.
To do this, I am appending a string to an integer variable so that each new photo name can be unique and conform to the format of the second argument of CreateBMPFile. This would usually be a case of writing TEXT("string literal"), but I need to keep modifying the filename as each new photo is created.
PBITMAPINFO pbi = CreateBitmapInfoStruct(hwnd, hbm);
int i = 1;
std::string image = "..\\..\\..\\..\\WebCam\\frame" + std::to_string(i) + ".bmp";
while (!exists(image)) {
LPTSTR filename = (LPTSTR)image.c_str();
CreateBMPFile(hwnd, filename, pbi, hbm, hdcMem);
i++;
}
This compiles and executes, however, when I click the "Grab Frame" button and it attempts to save it, the application crashes i.e. I cannot see the GUI anymore and it becomes a stagnant process.
I am using an exists() function to see whether the file exists in the system:
inline bool exists(const std::string& name) {
struct stat buffer;
return (stat(name.c_str(), &buffer) == 0);
}
I've also tried using sprintf_s() with the same result of crashing the application.
Related
Context:
I have an application that searches files in a directory using QDirIterator, filters and copies specific files.
Problem:
Using the results from QDirIterator::next(), I ensure the file exists (as a unnecessary safe measure) using QFile::exists(QString) which is valid.
However, when attempting to copy the file using CopyFileExW, it returns 0 meaning the file copy failed. I have absolutely no idea why.
File location:
C:/Users/CybeX/Documents/BLMS/Repo/BLMS-Work-Dev/Meeting 2 - Requirements Document Discussion & Dev/2020-05-19 11.22.30 Someone Person's Zoom Meeting 98661954658/zoom_0.mp4
Sanity Tests
I added some sanity tests to check the file content through the conversion from QString -> LPCWSTR as FileCopyExW requires LPCWSTR and it is suggested to convert QString -> LPCWSTR here.
Regarding the conversion, I have tried this too but it yields the same result. It is also suggested as bad practice to user c-style casts
Sanity tests (in application code below) all pass, but FileCopyExW always fails with:
"Error 0x80070002: The system cannot find the file specified."
Code inside application:
QString m_src = QString("C:/Users/CybeX/Documents/BLMS/Repo/BLMS-Work-Dev/Meeting 2 - Requirements Document Discussion & Dev/2020-05-19 11.22.30 Someone Person's Zoom Meeting 98661954658/zoom_0.mp4");
QString m_dst = QString("C:/Users/CybeX/Documents/BLMS/Repo/BLMS-Work-Dev/Meeting 2 - Requirements Document Discussion & Dev/2020-05-19 11.22.30 Someone Person's Zoom Meeting 98661954658/zoom_0.mp42");
// Hard coded test location attempting to match variables' content below
// QString srcLocation = QString("C:/Users/CybeX/Documents/BLMS/Repo/BLMS-Work-Dev/Meeting 2 - Requirements Document Discussion & Dev/2020-05-19 10.41.17 Someone Person's Zoom Meeting 96047275811/zoom_0.mp4");
// QString dstLocation = QString("C:/Users/CybeX/Documents/BLMS/Repo/BLMS-Work-Dev/Meeting 2 - Requirements Document Discussion & Dev/2020-05-19 10.41.17 Someone Person's Zoom Meeting 96047275811/zoom_0.mp44");
// std::wstring srcWString1 = srcLocation.toStdWString();
// std::wstring dstWString1 = dstLocation.toStdWString();
// const wchar_t* localC_src1 = srcLocation.toStdWString().c_str();
// const wchar_t* localC_dst1 = dstLocation.toStdWString().c_str();
//
// std::wstring srcWString = m_src.toStdWString();
// std::wstring dstWString = m_dst.toStdWString();
// Used inside copy function
const wchar_t* localC_src = m_src.toStdWString().c_str();
const wchar_t* localC_dst = m_dst.toStdWString().c_str();
// Sanity tests
if (m_src.contains("96047275811/zoom_0.mp4")) {
if (srcLocation != m_src) {
qDebug() << "Warning"; // Never gets hit
}
if (srcWString != srcWString1) {
qDebug() << "Warning"; // Never gets hit
}
if (*localC_src != *localC_src1) {
qDebug() << "Warning"; // Never gets hit
}
if (!QFile::exists(srcLocation)) {
qDebug() << "Warning"; // Never gets hit
}
}
auto rc = CopyFileExW(localC_src, localC_dst, &FileManager::copyProgress, this, &bStopBackup, 0);
if (rc == 0) {
printWarning(TAG, QString("File Copy Error: %1").arg(getLastErrorMsg()));
// copy failed
return FileResult::IOError; // This file always hits
}
// copy success
return FileResult::Success;
However, hard coding the file location in a custom test application does indeed work correctly.
Testing Application:
Result is successful
static QString toString(HRESULT hr)
{
_com_error err{hr};
const TCHAR* lastError = err.ErrorMessage();
return QStringLiteral("Error 0x%1: %2").arg((quint32)hr, 8, 16, QLatin1Char('0'))
.arg(lastError);
}
static QString getLastErrorMsg()
{
QString s = toString(HRESULT_FROM_WIN32(GetLastError()));
return s;
}
int main(int argc, char* argv[])
{
QCoreApplication a(argc, argv);
QString m_src = QString("C:/Users/CybeX/Documents/BLMS/Repo/BLMS-Work-Dev/Meeting 2 - Requirements Document Discussion & Dev/2020-05-19 11.22.30 Someone Person's Zoom Meeting 98661954658/zoom_0.mp4");
QString m_dst = QString("C:/Users/CybeX/Documents/BLMS/Repo/BLMS-Work-Dev/Meeting 2 - Requirements Document Discussion & Dev/2020-05-19 11.22.30 Someone Person's Zoom Meeting 98661954658/zoom_0.mp42");
auto rc = CopyFileExW(m_src.toStdWString().c_str(), m_dst.toStdWString().c_str(),
NULL, NULL, NULL, 0);
if (rc == 0) {
QString s = getLastErrorMsg();
// copy failed
qDebug() << "Failed";
}
else {
qDebug() << "Copied"; // Always gets hit
}
// copy success
return a.exec();
}
I am posting this answer for the record - hopefully someone else will benefit from it.
The result of GetLastError() returned 3, which according to this means a section in the path cannot be found, not the file, but the path, i.e. a directory. This got me thinking to debug the folder path.
After copying the same file to various directories along the path, and each was detected, I narrowed down the problematic path component 2020-05-19 11.22.30 Someone Person's Zoom Meeting 98661954658 it down to the folder name containing the single-quotation.
This was a happy mistake where I was working in the destination folder However, attempting to make a copy of the directory (to remove the single quote), Windows complained the path was too long (this was a folder that was already copied, containing the problematic file).
Summary
Basically, the source file was fine, the destination directory was created (programatically), but the copying the file to the destination resulted in a path too long for Windows, causing the 'system cannot find path' error (trickery!)
TL;DR:
Destination path was too long, resulting in a possibly misleading error code.
When trying to retrieve a leaderboard from Xbox Live, the stat event type get_leaderboard_complete returns the error code 404. I'm using Xbox Live in a UWP game in the Creators Program.
I'm am able to set and retrieve the stat for the user. This part works without issue:
xbox_live_result<stat_value> serverStat = m_statsManager->get_stat(m_user, L"score");
auto result = serverStat.payload();
if (result.as_integer() < score) {
setStatForUser(m_user, L"score", score);
}
My code is adopted from the leaderboard example in the Xbox Live Samples. So to retrieve my leaderboard I'm calling getLeaderboard(m_user, L"score"); and every frame I'm calling statsManager->do_work();.
// Process events from the stats manager
// This should be called each frame update
auto statsEvents = m_statsManager->do_work();
std::wstring text;
for (const auto& evt : statsEvents)
{
switch (evt.event_type())
{
case stat_event_type::local_user_added:
text = L"local_user_added";
break;
case stat_event_type::local_user_removed:
text = L"local_user_removed";
break;
case stat_event_type::stat_update_complete:
text = L"stat_update_complete";
break;
case stat_event_type::get_leaderboard_complete:
text = L"get_leaderboard_complete";
auto getLeaderboardCompleteArgs = std::dynamic_pointer_cast<leaderboard_result_event_args>(evt.event_args());
processLeaderboards(evt.local_user(), getLeaderboardCompleteArgs->result());
break;
}
stringstream_t source;
source << _T("StatsManager event: ");
source << text;
source << _T(".");
log("%S", source.str().c_str());
}
Because I'm able to set and retrieve the stat without issue, I wonder if maybe it's an issue with the Xbox Live backend? However, I'm not very familiar with the xbox live 2017 data platform, and I may be calling something incorrectly.
I discovered a solution:
Create a new stat/leaderboard in Dev Center.
Press the “Test” button. This is important because it publishes the service configuration.
I’m unsure why the original stat didn’t work. Perhaps because I used the word “score” as the statID.
I want to have a button in my (iOS) app that takes a screenshot of the current screen and then attaches it to a text message.
Like I have seen in this other app...
I have message sending working, and I think I have screenshot working, but I don't know where the screenshot is saved or how to use it.
My message sending is called from a button in the app...
void GameOverScene::messageCallBack(cocos2d::Ref *sender) {
CocosDenshion::SimpleAudioEngine::getInstance()->playEffect(ALL_BUTTONS_CLICK_SOUND_NAME);
utils::captureScreen( CC_CALLBACK_2(GameOverScene::afterCaptured, this), "screenshot.png" );
__String *messageTextOne = __String::create("sms:&body=Hey,%20I%20just%20hit%20a%20score%20of%20");
__String *messageTextTwo = __String::createWithFormat("%i", score);
__String *messageURL = __String::createWithFormat("%s%s", messageTextOne->getCString(), messageTextTwo->getCString());
Application::getInstance()->openURL(messageURL->getCString());
}
and the screenshot function is...
void GameOverScene::afterCaptured( bool succeed, const std::string &outputFile ) {
if (succeed) {
log("Screen capture succeeded");
Size screenSize = Director::getInstance()->getWinSize();
RenderTexture * tex = RenderTexture::create(screenSize.width, screenSize.height);
tex->setPosition(screenSize.width/2, screenSize.height/2);
tex->begin();
this->getParent()->visit();
tex->end();
tex->saveToFile("Image_Save.png", Image::Format::PNG);
} else {
log("Screen capture failed");
}
}
I get the message in the console "Screen capture succeeded", and my message app opens up with the prefilled text message.
What I need to do is to add the screenshot to this message, but I cant see how to do that, or where the screenshot is saved, or how to use the saved screenshot.
If it succeeded it's saved in private application directory. Use software like iExplorer, find your app and it should be inside Documents directory. If you want to see it in Photos you have manually add it there.
In order to achieve this, you have to call
UIImageWriteToSavedPhotosAlbum
see: How to save picture to iPhone photo library?
You have to create a function in AppController.m and use it from here. You can call objc code from c++. It requires UIImage so first you have to pass filepath and load uiimage from it and then finally add to gallery.
You can use something like this to get the path of image saved:
void CustomLayerColor::saveFile(Node*node, std::string fileName, const renderTextureCallback& callBack) {
float renderTextureWidth = node->getBoundingBox().size.width;
float renderTextureHeight = node->getBoundingBox().size.height;
RenderTexture * renderTexture = RenderTexture::create(renderTextureWidth,renderTextureHeight);
renderTexture->begin();
node->visit();
renderTexture->end();
renderTexture->saveToFile(fileName, Image::Format::PNG, true,callBack);
}
void CustomLayerColor::onSaveFileCallBack(RenderTexture * mRenderTexture, const std::string& savedFileNameWithFullPath) {
}
I'm new to shell programming and having trouble getting the filepath (or really, any information) about which item is being clicked on in a window (desktop or otherwise). I'm following the general path laid out by the answer to Can i use Global System Hooks to capture which file was clicked on? but I'm not having any luck.
The clicking is the smaller issue here, so I've just substituted random values (where I know the desktop is and where a file should be located) for the mouse position. (Regardless, it doesn't work even when I'm trying this out on my mouse's current position).
LVHITTESTINFO hitTest = { 0 };
hitTest.pt.x = 55;
hitTest.pt.y = 230;
hitTest.flags = LVHT_ONITEM;
currWindow = WindowFromPoint(pt);
int index = ListView_HitTest(currWindow, &hitTest);
//cout << index + " index";
//cout << hitTest.iItem + " iltem ";
if (index != -1) {
//char* itemText = new char[256];
std::vector<wchar_t> itemText(1024);
ListView_GetItemText(window, index, 0, &itemText[0], 256);
PIDLIST_ABSOLUTE filepidl;
SFGAOF out;
std::wstring strtext = std::wstring(itemText.begin(), itemText.end());
//cout << " ";
//cout << *(strtext.c_str()) + " ";
HRESULT parse = SHParseDisplayName(strtext.c_str(), NULL, &filepidl, SFGAO_CANDELETE, &out);
if (filepidl != NULL) {
LPTSTR filePath = new TCHAR[MAX_PATH];
BOOL getPath = SHGetPathFromIDList(filepidl, filePath);
cout << *filePath ;
}
}
This is part of my code. I think there's something wrong with how I'm getting the index of the file because it keeps returning 0 but I've been hacking at this for days and am stuck. The MSDN documentation is confusing to me at best.
Any help or insight would be appreciated! I can't find any example code of this online. Thanks!
Using the listview directly like this is not a good idea because Explorer is free to implement the shell view in any way it wants and in Windows 7 and later a Explorer window no longer uses a listview, it uses a custom control by default!
If you only care about the display name and invoking the default action you can use UI Automation, it should work on other types of windows/controls as well, not just a shell file list.
If you need to know the full path and other details you can use the IShellWindows interface. Examples can be found on Raymond Chens blog here and here...
I'm converting an app that was written in Silverlight, and so far I've succeeded in solving all of the problems, except for one:
For some reason, the emulator refuses to play any audio files of the app, and it doesn't even throw an exception. I've checked, and in the ringtone category it can make sounds.
The original code was :
<Grid x:Name="sharedFullScreenFilePathContainer"
Tag="{Binding StringFormat=\{0\},Converter={StaticResource fullScreenImageConverter}}">
<Image x:Name="fullScreenImage" Stretch="Fill"
Source="{Binding ElementName=sharedFullScreenFilePathContainer,Path=Tag, StringFormat=../Assets/images/\{0\}.jpg}"
ImageFailed="onFullScreenImageFailedToLoad" MouseLeftButtonDown="onPressedOnFullScreenImage" />
<MediaElement x:Name="mediaPlayer" AutoPlay="True"
Source="{Binding ElementName=sharedFullScreenFilePathContainer,Path=Tag, StringFormat=../Assets/sounds/\{0\}.wma}" />
</Grid>
so, the image that I set to this item's context is really shown, but the sound that really exists on the path I set to it doesn't play (I've checked in the "Bin" folder).
I've tried to use code instead of xaml, but I still have the same problem.
I've tried this (though it's usually used for background music):
AudioTrack audioTrack = new AudioTrack(new Uri("../Assets/sounds/" + fileToOpen, UriKind.Relative), "", "", "", null);
BackgroundAudioPlayer player = BackgroundAudioPlayer.Instance;
player.Track = audioTrack;
player.Play();
It didn't play anything, and also didn't throw any exception.
I've also tried the next code, but it throws an exception (file not found exception) probably because I don't call it right:
Stream stream = TitleContainer.OpenStream("#Assets/sounds/" + fileToOpen);
SoundEffect effect = SoundEffect.FromStream(stream);
FrameworkDispatcher.Update();
effect.Play();
I've also tried using wma files but it also didn't work.
I also tried to play with the "copy to output directory" parameter of the mp3 files (to "always" and "only if new" ) and with the "build action" parameter (to "none" and "content" ). Nothing helps.
Can anyone please help me? I didn't develop for Silverlight/WP for a very long time and I can't find out how to fix it .
Btw, since later I need to know when the sound has finished playing (and also to be able to stop it), I would like to use code anyway. I would be happy if you could also tell me how to do it too (I can ask it on a new post if needed).
EDIT:
ok , i've found out the problem : i kept getting a weird exception when using the MediaPlayer.Play() method , and after checking out about the exception , i've found out that it's a known issue , and that i need to call FrameworkDispatcher.Update(); right before i call the Play() method .
so the solution would be to do something like this:
Song song = Song.FromUri(...);
MediaPlayer.Stop();
FrameworkDispatcher.Update();
MediaPlayer.Play(song);
the exception is:
'System.InvalidOperationException' occurred in System.Windows.ni.dll"
i've found the solution here .
Now the question is why , and how come I didn't find anything related to it in the demos of windows phone ? Also , i would like to know what this function does .
ok , since nobody gave me an answer to both questions , and I still wish to give the bounty , I will ask another question :
If there is really no solution other than using the MediaPlayer class for windows phone , how do i capture the event of finishing playing an audio file ? Even getting the audio file duration doesn't work (keeps returning 0 length , no matter which class i've tried to use) ...
The BackgroundAudioPlayer can play files only from isolated storage or from a remote URI, that is why you can here anything!
If you have your file as resources in your app, you must first copy them to the isolated store, and then make a reference to the file in the isolated store to your BackgroundAudioPlayer.
private void CopyToIsolatedStorage()
{
using (IsolatedStorageFile storage = IsolatedStorageFile.GetUserStoreForApplication())
{
string[] files = new string[]
{ "Kalimba.mp3",
"Maid with the Flaxen Hair.mp3",
"Sleep Away.mp3" };
foreach (var _fileName in files)
{
if (!storage.FileExists(_fileName))
{
string _filePath = "Audio/" + _fileName;
StreamResourceInfo resource = Application.GetResourceStream(new Uri(_filePath, UriKind.Relative));
using (IsolatedStorageFileStream file = storage.CreateFile(_fileName))
{
int chunkSize = 4096;
byte[] bytes = new byte[chunkSize];
int byteCount;
while ((byteCount = resource.Stream.Read(bytes, 0, chunkSize)) > 0)
{
file.Write(bytes, 0, byteCount);
}
}
}
}
}
}
And then you can make a list of your songs
private static List<AudioTrack> _playList = new List<AudioTrack>
{
new AudioTrack(new Uri("Kalimba.mp3", UriKind.Relative),
"Kalimba",
"Mr. Scruff",
"Ninja Tuna",
null),
new AudioTrack(new Uri("Maid with the Flaxen Hair.mp3", UriKind.Relative),
"Maid with the Flaxen Hair",
"Richard Stoltzman",
"Fine Music, Vol. 1",
null),
new AudioTrack(new Uri("Sleep Away.mp3", UriKind.Relative),
"Sleep Away",
"Bob Acri",
"Bob Acri",
null),
// A remote URI
new AudioTrack(new Uri("http://traffic.libsyn.com/wpradio/WPRadio_29.mp3", UriKind.Absolute),
"Episode 29",
"Windows Phone Radio",
"Windows Phone Radio Podcast",
null)
};
And play your tracks!
private void PlayNextTrack(BackgroundAudioPlayer player)
{
if (++currentTrackNumber >= _playList.Count)
{
currentTrackNumber = 0;
}
PlayTrack(player);
}
private void PlayPreviousTrack(BackgroundAudioPlayer player)
{
if (--currentTrackNumber < 0)
{
currentTrackNumber = _playList.Count - 1;
}
PlayTrack(player);
}
private void PlayTrack(BackgroundAudioPlayer player)
{
// Sets the track to play. When the TrackReady state is received,
// playback begins from the OnPlayStateChanged handler.
player.Track = _playList[currentTrackNumber];
}
If you want the MediaElement to work from your code you can do something like this!
MediaElement me = new MediaElement();
// Must add the MediaElement to some UI container on
// your page or some UI-control, otherwise it will not play!
this.LayoutRoot.Children.Add(me);
me.Source = new Uri("Assets/AwesomeMusic.mp3", UriKind.RelativeOrAbsolute);
me.Play();
Use the MediaElement instead, this can play media files stored in your application, but stops playing when the application stops (you can make some advance chance to your app so it keep running, but it will not work very well)
In your XAML:
<Button x:Name="PlayFile"
Click="PlayFile_Click_1"
Content="Play mp3" />
In your Code behind:
MediaElement MyMedia = new MediaElement();
// Constructor
public MainPage()
{
InitializeComponent();
this.LayoutRoot.Children.Add(MyMedia);
MyMedia.CurrentStateChanged += MyMedia_CurrentStateChanged;
MyMedia.MediaEnded += MyMedia_MediaEnded;
}
void MyMedia_MediaEnded(object sender, RoutedEventArgs e)
{
System.Diagnostics.Debug.WriteLine("Ended event " + MyMedia.CurrentState.ToString());
// Set the source to null, force a Close event in current state
MyMedia.Source = null;
}
void MyMedia_CurrentStateChanged(object sender, RoutedEventArgs e)
{
switch (MyMedia.CurrentState)
{
case System.Windows.Media.MediaElementState.AcquiringLicense:
break;
case System.Windows.Media.MediaElementState.Buffering:
break;
case System.Windows.Media.MediaElementState.Closed:
break;
case System.Windows.Media.MediaElementState.Individualizing:
break;
case System.Windows.Media.MediaElementState.Opening:
break;
case System.Windows.Media.MediaElementState.Paused:
break;
case System.Windows.Media.MediaElementState.Playing:
break;
case System.Windows.Media.MediaElementState.Stopped:
break;
default:
break;
}
System.Diagnostics.Debug.WriteLine("CurrentState event " + MyMedia.CurrentState.ToString());
}
private void PlayFile_Click_1(object sender, RoutedEventArgs e)
{
// Play Awesome music file, stored as content in the Assets folder in your app
MyMedia.Source = new Uri("Assets/AwesomeMusic.mp3", UriKind.RelativeOrAbsolute);
MyMedia.Play();
}
Audio track plays audio files stored in isolated storage or streamed over the internet.
Playing audio files stored within the application package works fine for me. I got files named like "Alarm01.wma" in project folder Resources\Alarms. I then play these sounds like this:
using Microsoft.Xna.Framework.Media;
...
Song s = Song.FromUri("alarm", new Uri(#"Resources/Alarms/Alarm01.wma", UriKind.Relative));
MediaPlayer.Play(s);
Also don't forget to reference Microsoft.Xna.Framework library.
I guess it should work fine for mp3 files and files stored in IsolatedStorage as well.