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  • ATL CString or_bstr_t?

    - by Gopalakrishnan Subramani
    In our COM project, we need to choose between best string class implementation so that BSTR (used for COM interfaces) and elegant string class like CString provides many string manipulation APIs. Are there any better way to handle the strings and string operations so that it can be BSTR complaints as well as we can have naive CString operations?

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  • Uploading a file using post() method of QNetworkAccessManager

    - by user304361
    I'm having some trouble with a Qt application; specifically with the QNetworkAccessManager class. I'm attempting to perform a simple HTTP upload of a binary file using the post() method of the QNetworkAccessManager. The documentation states that I can give a pointer to a QIODevice to post(), and that the class will transmit the data found in the QIODevice. This suggests to me that I ought to be able to give post() a pointer to a QFile. For example: QFile compressedFile("temp"); compressedFile.open(QIODevice::ReadOnly); netManager.post(QNetworkRequest(QUrl("http://mywebsite.com/upload") ), &compressedFile); What seems to happen on the Windows system where I'm developing this is that my Qt application pushes the data from the QFile, but then doesn't complete the request; it seems to be sitting there waiting for more data to show up from the file. The post request isn't "closed" until I manually kill the application, at which point the whole file shows up at my server end. From some debugging and research, I think this is happening because the read() operation of QFile doesn't return -1 when you reach the end of the file. I think that QNetworkAccessManager is trying to read from the QIODevice until it gets a -1 from read(), at which point it assumes there is no more data and closes the request. If it keeps getting a return code of zero from read(), QNetworkAccessManager assumes that there might be more data coming, and so it keeps waiting for that hypothetical data. I've confirmed with some test code that the read() operation of QFile just returns zero after you've read to the end of the file. This seems to be incompatible with the way that the post() method of QNetworkAccessManager expects a QIODevice to behave. My questions are: Is this some sort of limitation with the way that QFile works under Windows? Is there some other way I should be using either QFile or QNetworkAccessManager to push a file via post()? Is this not going to work at all, and will I have to find some other way to upload my file? Any suggestions or hints would be appreciated. Thanks, Don

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  • Auto Resizing in a ClistCtrl

    - by Isuru
    Hi, Is there a way to resize the listcontrol automatically? Usually when the item gets too long the back end disappears from view and the user manually has to resize the width of the column. Is there anyway to do this by the code? Thank You!!

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  • Video capture on MacOS

    - by Andrea Girardi
    Hi to all I'm wrtiting a C++ application with Trolltech QT Library and I need to capture video stream from a camera and some medical instrumentations. What kind of hardware can I use to do this? I've tried with OpenCV but it doesn't recognize my EyeTV 250. Can I use Pinnacle Video capture for Mac? thanks, Andrea

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  • QTableWidget: How can I get tighter lines with less vertical spacing padding?

    - by Dirk Eddelbuettel
    The QTableWdiget is fabulous for simple grid displays. Changing colors, fonts, etc is straightforward. However, I did not manage to give the grid a 'tighter' look with less vertical whitespace. I see that the Qt documentation talks (eg here) about margin border padding around widgets, but when I set these I only get changes around the entire grid widget rather than inside. How can I set this (with a style sheet, or hard-coded options) directly to make the QTableWidget display tighter?

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  • Create XML File Using XML Schema

    - by metdos
    Is there any easy way to create at least a template XML file using XML Schema? My main interest is bounded by C++, but discussions of other programming languages are also welcome.By the way I also use QT framework.

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  • How to use CWnd::CreateEx

    - by chitra
    I was using CreateEx( 0, className, "XXX", WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN, rect, parent, 0); in Visual C++ 6.0. when i port the same to VS 2008.., its giving an error message saying that.. error C2664: 'BOOL CWnd::CreateEx(DWORD,LPCTSTR,LPCTSTR,DWORD,const RECT &,CWnd *,UINT,LPVOID)' : cannot convert parameter 3 from 'const char [7]' to 'LPCTSTR' how to rectify the same thanks Chitra

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  • What is 'System Usage Specification' ?

    - by rohit k.
    My software is a video-audio converter and video cutter. I have used Qt(compiled from source) and ffmpeg (compiled from source). I have to prepare System Usage Specification outline and Specify Usage patterns of the system and indicate it using Run charts / Histograms. I am told to use Winrunner for this purpose. I don't know exactly what to do. Please help.

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  • Why so much stack space used for each recursion?

    - by Harvey
    I have a simple recursive function RCompare() that calls a more complex function Compare() which returns before the recursive call. Each recursion level uses 248 bytes of stack space which seems like way more than it should. Here is the recursive function: void CMList::RCompare(MP n1) // RECURSIVE and Looping compare function { auto MP ne=n1->mf; while(StkAvl() && Compare(n1=ne->mb)) RCompare(n1); // Recursive call ! } StkAvl() is a simple stack space check function that compares the address of an auto variable to the value of an address near the end of the stack stored in a static variable. It seems to me that the only things added to the stack in each recursion are two pointer variables (MP is a pointer to a structure) and the stuff that one function call stores, a few saved registers, base pointer, return address, etc., all 32-bit (4 byte) values. There's no way that is 248 bytes is it? I don't no how to actually look at the stack in a meaningful way in Visual Studio 2008. Thanks

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  • Using mergedModelFromBundles: and versioning (CoreData)

    - by charlax
    Hi everybody, I'm trying to use the migration feature in CoreData. I've followed the Apple Documentation. I have a problem in the following method: /** Returns the managed object model for the application. If the model doesn't already exist, it is created by merging all of the models found in the application bundle. */ - (NSManagedObjectModel *)managedObjectModel { if (managedObjectModel != nil) { return managedObjectModel; } /* * NSInvalidArgumentException', reason: '*** -[NSCFArray insertObject:atIndex:]: attempt to insert nil' * 2010-02-17 16:27:15.338 Patrimoine[3037:207] */ managedObjectModel = [[NSManagedObjectModel mergedModelFromBundles:nil] retain]; return managedObjectModel; } It appears that there is the same problem on http://iphonedevelopment.blogspot.com/2009/09/core-data-migration-problems.html Yet I did choose the method Apple suggests, by using the menu option "Add Model Version". Do you have any idea?

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  • How to specify different Debug/Release output directories in QMake .pro file

    - by esavard
    I have a Qt project and I would like to output compilation files outside the source tree. I currently have the following directory structure: / |_/build |_/mylib |_/include |_/src |_/resources Depending on the configuration (debug/release), I will like to output the resulting files inside the build directory under build/debug or build/release directories. How can I do that using a .pro file?

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  • bitmap button not displaying in 3D style

    - by Rohit Sasikumar
    Hi, I want to display on my dialog, a bitmap button. I am using the below code CImage image; hr = image.Load(_T("myimage.png")); // just change extension to load jpg bitmap.Attach(image.Detach()); m_button.ModifyStyle(0,BS_BITMAP); m_button.SetBitmap(bitmap); This way bitmap is correctly displayed on button, but the button is not displayed in 3D style as normal buttons would look. I have set owner drawn property to false, still it displaying like this. Any ideas as to what could be wrong? Thanks, Rohit

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  • Software evaluation - licence

    - by sijith
    Hi, Can any one help me on software licence module. We created a new application and want to release a demo version(30 days trial) of our tool later we need full version. How can i generate license file or license code and how to limit 30 days evaluation. Please give me some help on this. Our application is developed on windows in QT

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  • Identifier for win64 configuration in Qmake

    - by Tuminoid
    Is there a "win64" identifier in Qmake project files? Qt Qmake advanced documentation does not mention other than unix / macx / win32. So far I've tried using: win32:message("using win32") win64:message("using win64") amd64:message("using amd64") The result is always "using win32". Must I use a separate project-file for x32 and x64 projects, so they would compile against correct libraries? Is there any other way to identify between 32-bit and 64-bit environments?

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  • Icons on CMFCOutlookBar

    - by steve-weeks
    I'm using CMFCOutlookBar from the Feature Pack, and I'm trying to put an icon on the "button" of the tabbed pane - the thing that slides up and down in the bar, when you select a pane. The pane API includes a "SetIcon" function, but this doesn't do anything as far as I can tell. Neither does the "SetTabHicon" function of the bar. Does anyone know how to do this?

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  • ShowWindow not working from a DLL on a 64-bit OS?

    - by Auto Roast
    I have a process that calls SetWindowsHook to catch keyboard events. In the DLL that processes the events, I conditionally call ShowWindow on the handle of the window of the process who set the hook. That code works perfectly on a 32-bit OS (XP) and as a 32-bit application on a 64-bit OS, but when compiled to 64-bit, the window is not showing. The code to make the window visible is: if (idx == passlen) { HWND h = FindWindow(NULL,windowNameToShow); ShowWindow(h,SW_SHOW); idx = 0; logger->backerase(passlen - 1); nextCharToMatch = passPointer; }

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  • Convert CString array to System::String

    - by Anu
    Hi, I want to convert CString array to managed code ot send it to C#. For normal CString i did like this, CString menu = "MENU"; String ^ msg = gcnew String(menu); Globals1::gwtoolbar->Add(msg); But now i want to send array of string.i dont know how to do for CString array. When i gave like this it shows error CString menu[10]; String[] ^ msg = gcnew String(menu); How can i convert it?

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  • SetCurrentDirectory timing out

    - by Callum
    Is it possible for the SetCurrentDirectory() to timeout if there is network slowdown preventing the directory from being accessed for some length of time? (In the order of 15-30 seconds...?) If so is the timeout configurable and where can it be set?

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