Problem: How do I copy resource files, while preserving file names, to the disk in a platform independent way? Example and Explanation: I have files in my Resource File e.g.::/student/studtemp (student/template.txt):/student/examples/studexOne (student/examples/studentexample1.txt):/student/examples/studexTwo (student/examples/studentexample2.txt):/lecturer/lectemp (lecturer/template.txt):/lecturer/lecex (lecturer/lecturerexample.txt):/lecturer/data/lecdata (lecturer/data/datafile.dat) I would like to copy these files on to the disk, for sake of the example, preserve the file structure. So the resulting folder structure should be something like this (unix system): $ ls $PWD student lecturer $ ls $PWD/student template.txt examples $ ls $PWD/lecturer template.txt lecturerexample.txt data There is a method suggested to copy to filesystem, as shown below, but the file name needs to be specified.
However this should be automated to get the resource's original filename. Currently I need to do the following to replicate the folder structure: QDir::mkpath('./student'); QFile::copy(':/student/template.txt', './student/template.txt') However I cannot believe that this is the best way. Also, this method is platform dependant, due to the directory separators (trivial problem though). Are there any better ways to achieve this?
The Qt resource system is a platform-independent mechanism for storing binary files in the application's executable. This is useful if your application always needs a certain set of files (icons, translation files, etc.) and you don't want to run the risk of losing the files. The resource system is based on tight cooperation between, (Qt's resource compiler), and. It obsoletes Qt 3's qembed tool and the mechanism. Resource Collection Files (.qrc) The resources associated with an application are specified in a.qrc file, an XML-based file format that lists files on the disk and optionally assigns them a resource name that the application must use to access the resource. Here's an example.qrc file.
The specified paths are relative to the directory containing the.qrc file. Note that the listed resource files must be located in the same directory as the.qrc file, or one of its subdirectories. Resource data can either be compiled into the binary and thus accessed immediately in application code, or a binary resource can be created and at a later point in application code registered with the resource system. By default, resources are accessible in the application under the same file name as they have in the source tree, with a:/ prefix, or by a with a qrc scheme. For example, the file path:/images/cut.png or the URL qrc:///images/cut.png would give access to the cut.png file, whose location in the application's source tree is images/cut.png.
This can be changed using the file tag's alias attribute. Cut.jpg cutfr.jpg If the user's locale is French (i.e.,.name returns 'frFR'),:/cut.jpg becomes a reference to the cutfr.jpg image. For other locales, cut.jpg is used.
See the documentation for a description of the format to use for locale strings. External Binary Resources For an external binary resource to be created you must create the resource data (commonly given the.rcc extension) by passing the -binary switch to.
Once the binary resource is created you can register the resource with the API. For example, a set of resource data specified in a.qrc file can be compiled in the following way. RESOURCES = application.qrc qmake will produce make rules to generate a file called qrcapplication.cpp that is linked into the application. This file contains all the data for the images and other resources as static C arrays of compressed binary data. The qrcapplication.cpp file is automatically regenerated whenever the.qrc file changes or one of the files that it refers to changes. If you don't use.pro files, you can either invoke rcc manually or add build rules to your build system. Currently, Qt always stores the data directly in the executable, even on Windows and Mac OS X, where the operating system provides native support for resources.
This might change in a future Qt release. Compression Resources are compressed by default (in the ZIP format). It is possible to turn off compression. This can be useful if your resources already contain a compressed format, such as.png files. You do this by giving the -no-compress command line argument. CutAct = new ( ( ':/images/cut.png'), tr( 'Cu&t'), this); See the example for an actual application that uses Qt's resource system to store its icons. In memory, resources are represented by a tree of resource objects.
The tree is automatically built at startup and used by for resolving paths to resources. You can use a initialized with ':/' to navigate through the resource tree from the root. Qt's resources support the concept of a search path list.
If you then refer to a resource with: instead of:/ as the prefix, the resource will be looked up using the search path list. The search path list is empty at startup; call to add paths to it. If you have resources in a static library, you might need to force initialization of your resources by calling with the base name of the.qrc file.
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. QTemporaryFile and Qfile::copy. If this is your first visit, be sure to check out the by clicking the link above. You may have to before you can post: click the register link above to proceed.
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You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please,! If you have any problems with the registration process or your account login, please. Hi Guys, I have a need to copy an existing file, or resource, into a temporary file.
I can use the to create an empty temporary file in a safe fashion. However, to use to move my data I need the target file to not exist. If I grab the fileName and remove the temp file then I have put myself back into the race condition that tmpnam (3) warns against and that QTemporaryFile is designed to avoid. There does not seem to be a file copy that uses open QFile (QIODevice) as source and target.
Is there an elegant QT approach to this problem? Cheers, Chris Edit: I can use on the resource to get the copy on to disc, but this will not copy an already local file.
Last edited by ChrisW67; 22nd April 2009 at 03:11.
The Qt resource system is a platform-independent mechanism for storing binary files in the application's executable. This is useful if your application always needs a certain set of files (icons, translation files, etc.) and you don't want to run the risk of losing the files. The resource system is based on tight cooperation between, (Qt's resource compiler), and. Resource Collection Files (.qrc) The resources associated with an application are specified in a.qrc file, an XML-based file format that lists files on the disk and optionally assigns them a resource name that the application must use to access the resource.
Here's an example.qrc file.
Copy To Disk Windows 10
This can be changed using the file tag's alias attribute. Cut.jpg cutfr.jpg If the user's locale is French (i.e.,.name returns 'frFR'),:/cut.jpg becomes a reference to the cutfr.jpg image.
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For other locales, cut.jpg is used. See the documentation for a description of the format to use for locale strings. External Binary Resources For an external binary resource to be created you must create the resource data (commonly given the.rcc extension) by passing the -binary switch to. Once the binary resource is created you can register the resource with the API. For example, a set of resource data specified in a.qrc file can be compiled in the following way.
RESOURCES = application.qrc qmake will produce make rules to generate a file called qrcapplication.cpp that is linked into the application. This file contains all the data for the images and other resources as static C arrays of compressed binary data. The qrcapplication.cpp file is automatically regenerated whenever the.qrc file changes or one of the files that it refers to changes. If you don't use.pro files, you can either invoke rcc manually or add build rules to your build system. Currently, Qt always stores the data directly in the executable, even on Windows, macOS, and iOS, where the operating system provides native support for resources. This might change in a future Qt release. Compression Resources are compressed by default (in the ZIP format).
It is possible to turn off compression. This can be useful if your resources already contain a compressed format, such as.png files. You do this by giving the -no-compress command line argument. CutAct = new ( ( ':/images/cut.png'), tr( 'Cu&t'), this); See the example for an actual application that uses Qt's resource system to store its icons. In memory, resources are represented by a tree of resource objects. The tree is automatically built at startup and used by for resolving paths to resources. You can use a initialized with ':/' to navigate through the resource tree from the root. Body mind and sport john douillard pdf.
Qt's resources support the concept of a search path list. If you then refer to a resource with: instead of:/ as the prefix, the resource will be looked up using the search path list. The search path list is empty at startup; call to add paths to it. Using Resources in a Library If you have resources in a library, you need to force initialization of your resources by calling with the base name of the.qrc file.