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• SetSel on EN_SETFOCUS or WM_SETFOCUS doesn't work

  - by Coder

  I've ran into next mystic thing in Winapi/MFC, I have an edit box, contents of which I have to select on Tab, Lclick, Rclick, Mclick and so on. The sort of obvious path is to handle the SETFOCUS message and call SetSel(0, -1), which should select all text. But it doesn't work! What's wrong? I tried googling, everyone seems to override Lclilks or handle SetSel in parent windows, but this is wrong from encapsulation point of view, also multiple clicks (user wants to insert something in the middle of the text) will break, and so on. Why isn't my approach working, I tried like 10 different ways, tried to trap all possible focus messages, looked up info on MSDN, but nothing works as expected. Also, I need to recreate the carret on focus, which also doesn't seem to work. SETFOCUS message gets trapped alright. If I add __asm int 3, it breaks every time. It's the create carret and setsel that gets swallowed it seems.

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• Windows Constants for Ctrl+X, Ctrl+C, and Ctrl+V

  - by Jonathan Wood

  I've got some older MFC code I wrote that I'm "freshening up" a bit. I have the following code in a window class' OnChar() handler. I really don't like using constants like 0x18. I'd like to make the code more readable. I know I can declare my own, but are there no Windows macros for these values? I couldn't find anything about this on the web. // Check for clipboard commands switch (nChar) { case 0x18: // Ctrl+X - Cut OnEditCut(); break; case 0x03: // Ctrl+C - Copy OnEditCopy(); break; case 0x16: // Ctrl+V - Paste OnEditPaste(); break; }

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• WinDbg can't find mfc90 version 9.0.30729.4148 symbols on msdl.microsoft.com

  - by Simon Hofverberg

  I think the title states my problem fairly well. Where are those mfc symbols? Some background info: I have a crash dump that I want to analyze in WinDbg. My symbol path contains msdl.microsoft.com/download/symbols (and it says h t t p first but I'm a new user here so I'm not allowed to write that twice. The 9.0.30729.4148 version seems to be installed by some Windows update When a dump contains an earlier version of mfc90, it is located by WinDbg on the Microsoft symbol server with the same settings. When I use !sym noisy, the output for mfc90.dll contains: SYMSRV: http://msdl.microsoft.com/download/symbols/mfc90.dll/4A596D4939c000/mfc90.dll not found The same thing happens on two different computers Edit: See my comments below. The symbols are present on the server, but WinDbg can't get them.

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• Code coverage in Win32 app

  - by graham.reeds

  We are just about to start a new project. The Proof of Concept (PoC) for this project was done simply using Win32. The plan is/was to flesh out the PoC, tidy the uglier parts and meet the requirements set by the project owners. One of the requirements for the actual project is 100% code coverage but I can see problems ahead: How can I acheive 100% code coverage with Win32 - the message pump will be exceptionally difficult to test effectively?! I could compile to a DLL but won't there be code in the main app that won't be under coverage? I am thinking of dropping the Win32 code and moving to MFC - at least then a lot of the boiler plate stuff will be hidden from view (and therefore coverage). Any thoughts on the problem?

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• Can a CWinApp be placed in a DLL?

  - by jmucchiello

  I'm updating some legacy apps to Visual Studio 10 and am in linker hell. All of these DLLs derive classes from CWinApp and use AfxGetApp() to get access to the object. When I link the DLLs I get unresolved externals that look like global static objects that would get pulled in by a normal app's main(): Shell.lib(SHELL.obj) : error LNK2001: unresolved external symbol "public: static struct CRuntimeClass const CException::classCException" (?classCException@CException@@2UCRuntimeClass@@B) Shell.lib(SHELL.obj) : error LNK2001: unresolved external symbol "public: static struct CRuntimeClass const CFrameWnd::classCFrameWnd" (?classCFrameWnd@CFrameWnd@@2UCRuntimeClass@@B) Shell.lib(SHELL.obj) : error LNK2001: unresolved external symbol "public: static class CRect const CFrameWnd::rectDefault" (?rectDefault@CFrameWnd@@2VCRect@@B) My current combination of ignore default libraries and additional libraries (the method you can easily google to find the answer to linker hell) is: msvcprtd.lib,mfc100d.lib,mfcs100d.lib,libcmtd.lib When I add nafxcwd.lib (the mfc library), these three external symbols resolve but I end up with a bunch of other duplicate symbols (requiring the use of /FORCE:MULTIPLE) and in end __argc and __argv become unresolved. So the basic question is: Can you link a DLL containing a CWinApp in VS10? How do you setup the linker to do it?

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• Facing problem in VB6.0 Activex Controls design.

  - by Dharmaraju

  Hi, This is dharmaraju, I am facing some problem in Activex Controls design. Kindly help me to resolve the issue. Problem Description: I have created a property mentioned below for a textbox. Public Property Let DataControl_Value(ByVal Value As Variant) Public Property Get DataControl_Value() As Variant This property is editable at design time if i use it VB6.0 Applications. Same thing is read only in case if i use it in vc++ MFC applications. I have defined one more property like below. Public Property Let DataControl_DataItemDef(ByVal Value As DTMDATACONTROLLib.IXMLDOMNode) Public Property Get DataControl_DataItemDef() As DTMDATACONTROLLib.IXMLDOMNode In this case the "DataControl_DataItemDef" property will not be available at design time.[not displaying in control's property window.] Kindly help me to resolve the issue.

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• why message box is always hidden behind main dialog and cannot be shown on the top

  - by Cougar_usa

  I am using MFC to write a GUI application. I chose dialog-based application, and put picture control, edit box and buttons on it. When the picture control is mapped to the class derived from CWnd using DDX_Control, all the message boxes (including default system message box pop up when you enter invalid input in the edit box) are hidden behind main dialog until you use "alt + tab" to bring them to front. If I map the picture control to the default CStatic class, the above problem disappeared. Do anyone has some hints to solve this problem? Thank you in advance for any help.

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• 'Generating code' and stop in building release mode (Visual Studio 2005 )

  - by cchcc

  Hi! I have a problem about release build I'm using Visual Studio 2005. The project is worked on MFC When I build the project what I working in debug mode, It builds done successfully. but in release mode, Output window shows next 1Compiling resources... 1Linking... 1Generating code and then.. it doesn't pass. It seems like be stoped. After 20 min ,I just canceld build. It has been built well before. I just added some files(.h .cpp) and resorces(.bmp), not special code and it happened. Do you have any idea about that? please help me

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• Do you know of a good program for editing/translating resource (.rc) files?

  - by djeidot

  I'm building a C++/MFC program in a multilingual environment. I have one main (national) language and three international languages. Every time I add a feature to the program I have to keep the international languages up-to-date with the national one. The resource editor in Visual Studio is not very helpful because I frequently end up leaving a string, dialog box, etc., untranslated. I wonder if you guys know of a program that can edit resource (.rc) files and Build a file that includes only the strings to be translated and their respective IDs and accepts the same (or similar) file in another language (this would be helpful since usually the translation is done by someone else), or Handle the translations itself, allowing to view the same string in different languages at the same time.

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• MS VC++ 6 class wizard

  - by Shane MacLaughlin

  Ok, I'm developing an application that has been in pretty much continous development over the last 16 years, from C in DOS, through various flavours of C++ and now is largely based around C++ with MFC and StingRay GUIs and various other SDKs. While I use VS 2005 for the release builds, I still use MSVC 6 for much of the GUI building, simply because ClassWizard is so much quicker in this environment than the weak equivalent tools that followed. Note that I am using ClassWizard to automatically generate code for my own user defined types (see Custom DDXs) and I like to add a lot of member variables and methods in one go. Creating them one at a time as per later versions of Visual Studio for me is a big backward step. At the same time, working with multiple IDEs is also a pain. My question is in two parts; Is there any way of getting ClassWizard to work is VS 2005 or VS 2008? Is there any drop in replacement, or alternative IDE, that provides similar levels of productivty for old C++ hacks such as myself?

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• Positioning the dialog box in the centre of the screen

  - by ame

  I have a dialog box developed in mfc for a Windows CE device and want it to occupy the entire screen. I used the following code to center my dialog box on the lcd screen of the device: CWnd* pWnd = GetDesktopWindow(); CenterWindow(pWnd); However, I still get a tiny sliver of space on the left side of the dialog box, resizing the dialog merely makes it overflow on the right side of the LCD while the tiny space on the left remains (I can see the blue of the win CE desktop behind.) Are there any suggestions to solve this problem? I checked the margin settings for this dialog box in my .rc files and leftmargin and topmargin are both set to 0. I was wondering if I could get the coordinates of the centre of the screen and then place my window one or two points to the left to deal with the current offset. A messy approach I know!

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• OnSize() Problem in VC++

  - by Anu

  Hi, In my VC++ MFC applcaiton,i have different views.And in each view,when i maximize it,i changed the size and position to new thing(Normally it fully get maximixed to screen size).But i dont want tht.So in OnSize() i coded like this. void CChildFrame::OnSize(UINT nType, int cx, int cy) { CMDIChildWnd::OnSize(nType, cx, cy); int XBorder = GetSystemMetrics(SM_CXMAXIMIZED); int YBorder = GetSystemMetrics(SM_CYMAXIMIZED); switch (nType) { case SIZE_MAXIMIZED: SetWindowPos(NULL,0,60,XBorder-45,YBorder-60,SWP_NOZORDER ); break; } } But what happened is?When i maximize the view,its get maximized to above mention size only.But in that blue bar,there si no minimize,maximize,close button. When i double click in the blue bar,its get to resumed to previous postion with all buttons. How can i get that?

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• Questions regarding Web Service development in C++

  - by Eduardo León

  The purpose of this question is to play a joke, but the question itself is serious. Inspired by DOS on Dope, I want to make my own framework for Web Service development based on MFC serialization. However, my only experience in Web Service development consists in having written a toy ASP.NET Web Service. All I had to do to expose a method was... [WebMethod] public ReturnType ExposedMethod(InputType1 param1, InputType2 param2) { //... } ... and ASP.NET took care of the rest for me. Obviously, I will have to do everything by hand in my own framework. Thus, I would like to delve a bit more into the little details of how ordinary SOAP Web Services work, in order to replicate them. So I have mainly two questions: Where can I find the details on how SOAP Web Services work, and what ASP.NET hides from me? What are the main challenges I am going to find in my completely lunatic project?

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• QGraphicsView scrolling and image scaling/cropping

  - by boohoo

  I would like to have a background image in my QGraphicsView that is always scaled (and cropped if necessary) to the size of the viewport, without scrollbars and without scrolling with the keyboard and mouse. The example below is what I am doing to scale and crop an image in the viewport, but I am using random values for the cropping that are pulled out of the aether. I would like a logical solution? MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); scene = new QGraphicsScene(this); ui->graphicsView->resize(800, 427); // MainWindow is 800x480, GraphicsView is 800x427. I want an image that // is the size of the graphicsView. ui->graphicsView->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff); ui->graphicsView->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff); // the graphicsView still scrolls if the image is too large, but // displays no scrollbars. I would like it not to scroll (I want to // add a scrolling widget into the QGraphicsScene later, on top of // the background image.) QPixmap *backgroundPixmap = new QPixmap(":/Valentino_Bar_Prague.jpg"); QPixmap sized = backgroundPixmap->scaled( QSize(ui->graphicsView->width(), ui->graphicsView->height()), Qt::KeepAspectRatioByExpanding); // This scales the image too tall QImage sizedImage = QImage(sized.toImage()); QImage sizedCroppedImage = QImage(sizedImage.copy(0,0, (ui->graphicsView->width() - 1.5), (ui->graphicsView->height() + 19))); // so I try to crop using copy(), and I have to use these values // and I am unsure why. QGraphicsPixmapItem *sizedBackground = scene->addPixmap( QPixmap::fromImage(sizedCroppedImage)); sizedBackground->setZValue(1); ui->graphicsView->setScene(this->scene); } I would like to know a way to scale and crop an image to the size of the QGraphicsView that will work even when I resize the QGraphicsView. Where are the 1.5 and 19 coming from?

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• C++ smart pointers: sharing pointers vs. sharing data

  - by Eli Bendersky

  In this insightful article, one of the Qt programmers tries to explain the different kinds of smart pointers Qt implements. In the beginning, he makes a distinction between sharing data and sharing the pointers themselves: First, let’s get one thing straight: there’s a difference between sharing pointers and sharing data. When you share pointers, the value of the pointer and its lifetime is protected by the smart pointer class. In other words, the pointer is the invariant. However, the object that the pointer is pointing to is completely outside its control. We don’t know if the object is copiable or not, if it’s assignable or not. Now, sharing of data involves the smart pointer class knowing something about the data being shared. In fact, the whole point is that the data is being shared and we don’t care how. The fact that pointers are being used to share the data is irrelevant at this point. For example, you don’t really care how Qt tool classes are implicitly shared, do you? What matters to you is that they are shared (thus reducing memory consumption) and that they work as if they weren’t. Frankly, I just don't undersand this explanation. There was a clarification plea in the article comments, but I didn't find the author's explanation sufficient. If you do understand this, please explain. What is this distinction, and how are other shared pointer classes (i.e. from boost or the new C++ standards) fit into this taxonomy? Thanks in advance

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• QFileDialog filter from mime-types

  - by Mathias

  I want the filter in a QFileDialog to match all audio file types supported by Phonon on the platform in question. 1 - However I am not able to find a way in Qt to use mime types in a filter. How can I do that? 2 - Or how can I find the corresponding file extensions for the mimetypes manually? The solution should be Qt based, or at least be cross platform and supported everywhere Qt is. Following is a short code describing my problem: #include <QApplication> #include <QFileDialog> #include <QStringList> #include <phonon/backendcapabilities.h> QString mime_to_ext(QString mime) { // WHAT TO REALLY DO ?? // NEEDLESS TO SAY; THIS IS WRONG... return mime.split("/").back().split('-').back(); } int main(int argc, char **argv) { QApplication app(argc, argv); QStringList p_audio_exts; QStringList p_mime_types = Phonon::BackendCapabilities::availableMimeTypes(); for(QStringList::iterator i = p_mime_types.begin(), ie = p_mime_types.end(); i != ie; i++) { if((*i).startsWith("audio")) p_audio_exts << mime_to_ext(*i); } QString filter = QString("All Files(*)"); if(!p_audio_exts.isEmpty()) { QString p_audio_filter = QString("Audio Files (*.%1)").arg(p_audio_exts.join(" *.")); filter = QString("%1;;%2").arg(p_audio_filter).arg(filter); } QFileDialog dialog(NULL, "Open Audio File", QString::null, filter); dialog.exec(); }

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• How to install PySide v0.3.1 on Mac OS X?

  - by ivo

  I'm trying to install PySide v0.3.1 in Mac OS X, for Qt development in python. As a pre-requisite, I have installed CMake and the Qt SDK. I have gone through the documentation and come up with the following installation script: export PYSIDE_BASE_DIR="<my_dir>" export APIEXTRACTOR_DIR="$PYSIDE_BASE_DIR/apiextractor-0.5.1" export GENERATORRUNNER_DIR="$PYSIDE_BASE_DIR/generatorrunner-0.4.2" export SHIBOKEN_DIR="$PYSIDE_BASE_DIR/shiboken-0.3.1" export PYSIDE_DIR="$PYSIDE_BASE_DIR/pyside-qt4.6+0.3.1" export PYSIDE_TOOLS_DIR="$PYSIDE_BASE_DIR/pyside-tools-0.1.3" pushd . cd $APIEXTRACTOR_DIR cmake . cd $GENERATORRUNNER_DIR cmake -DApiExtractor_DIR=$APIEXTRACTOR_DIR . cd $SHIBOKEN_DIR cmake -DApiExtractor_DIR=$APIEXTRACTOR_DIR -DGeneratorRunner_DIR=$GENERATORRUNNER_DIR . cd $PYSIDE_DIR cmake -DShiboken_DIR=$SHIBOKEN_DIR/libshiboken -DGENERATOR=$GENERATORRUNNER_DIR . cd $PYSIDE_TOOLS_DIR cmake . popd Now, I don't know if this installation script is ok, but apparently everything works fine. Each component (apiextractor, generatorrunner, shiboken, pyside-qt and pyside-tools) gets compiled into its own directory. The problem is that I don't quite understand how PySide gets into the system's python environment. In fact, when I start a python shell, I cannot import PySide: >>> import PySide Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: No module named PySide Note: I am aware of the Installing PySide - OSX question, but that question is not relevant anymore, because it is about a specific a dependency on the Boost libraries, but with version 0.3.0 PySide moved from a Boost based source code to a CPython one.

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• Calling QAxWidget method outside of the GUI thread

  - by user304361

  I'm beginning to wonder if this is impossible, but I thought I'd ask in case there's a clever way to get around the problems I'm having. I have a Qt application that uses an ActiveX control. The control is held by a QAxWidget, and the QAxWidget itself is contained within another QWidget (I needed to add additional signals/slots to the widget, and I couldn't just subclass QAxWidget because the class doesn't permit that). When I need to interact with the ActiveX control, I call a method of the QWidget, which in turn calls the dynamicCall method of the QAxWidget in order to invoke the appropriate method of the ActiveX control. All of that is working fine. However, one method of the ActiveX control takes several seconds to return. When I call this method, my entire GUI locks up for a few seconds until the method returns. This is undesirable. I'd like the ActiveX control to go off and do its processing by itself and come back to me when it's done without locking up the Qt GUI. I've tried a few things without success: Creating a new QThread and calling QAxWidget::dynamicCall from the new thread Connecting a signal to the appropriate slot method of the QAxWidget and calling the method using signals/slots instead of using dynamicCall Calling QAxWidget::dynamicCall using QtConcurrent::run Nothing seems to affect the behavior. No matter how or where I use dynamicCall (or trigger the appropriate slot of the QAxWidget), the GUI locks until the ActiveX control completes its operation. Is there any way to detach this ActiveX processing from the Qt GUI thread so that the GUI doesn't lock up while the ActiveX control is running a method? Is there something clever I can do with QAxBase or QAxObject to get my desired results?

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• Number of characters recommended for a statement

  - by liaK

  Hi, I have been using Qt 4.5 and so do C++. I have been told that it's a standard practice to maintain the length of each statement in the application to 80 characters. Even in Qt creator we can make a right border visible so that we can know whether we are crossing the 80 characters limit. But my question is, Is it really a standard being followed? Because in my application, I use indenting and all, so it's quite common that I cross the boundary. Other cases include, there might be a error statement which will be a bit explanatory one and which is in an inner block of code, so it too will cross the boundary. Usually my variable names look bit lengthier so as to make the names meaningful. When I call the functions of the variable names, again I will cross. Function names will not be in fewer characters either. I agree a horizontal scroll bar shows up and it's quite annoying to move back and forth. So, for function calls including multiple arguments, when the boundary is reached I will make the forth coming arguments in the new line. But besides that, for a single statement (for e.g a very long error message which is in double quotes " " or like longfun1()->longfun2()->...) if I use an \ and split into multiple lines, the readability becomes very poor. So is it a good practice to have those statement length restrictions? If this restriction in statement has to be followed? I don't think it depends on a specific language anyway. I added C++ and Qt tags since if it might. Any pointers regarding this are welcome.

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• Rails uniqueness constraint and matching db unique index for null column

  - by Dave

  I have the following in my migration file def self.up create_table :payment_agreements do |t| t.boolean :automatic, :default => true, :null => false t.string :payment_trigger_on_order t.references :supplier t.references :seller t.references :product t.timestamps end end I want to ensure that if a product_id is specified it is unique but I also want to allow null so I have the following in my model: validates :product_id, :uniqueness => true, :allow_nil => true Works great but I should then add an index to the migration file add_index :payment_agreements, :product_id, :unique => true Obviously this will throw an exception when two null values are inserted for product_id. I could just simply omit the index in the migration but then there's the chance that I'll get two PaymentAgreements with the same product_id as shown here: Concurrency and integrity My question is what is the best/most common way to deal with this problem

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• How can I update fontconfig to a newer version in Red Hat 5.3?

  - by user16654

  I want to update fontconfig to a newer version but it seems that the OS is still finding the old fontconfig and I need the newer version to build qt. How do I make Red Hat 5.3 see the newer version? I do not know if this helps but when I did a search for fontconfig I found some files in a folder called cache. When I do yum update it tells me everything is up to date but that version is too old and is missing FcFreeTypeQueryFace. Just send me a comment if this is wrong site and ill change it.

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• asp to asp.net migration assistant in visual studio 2008

  - by harun123

  Can anybody tell me how i can use **asp to asp.net migration assistant** in **visual studio 2008**? for this i actually need **frame work v1.1.4322**. please suggest the best way of doing it....

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• Scaling a CBitmap - what am I doing wrong?

  - by Smashery

  I've written the following code, which attempts to take a 32x32 bitmap (loaded through MFC's Resource system) and turn it into a 16x16 bitmap, so they can be used as the big and small CImageLists for a CListCtrl. However, when I open the CListCtrl, all the icons are black (in both small and large view). Before I started playing with resizing, everything worked perfectly in Large View. What am I doing wrong? // Create the CImageLists if (!m_imageListL.Create(32,32,ILC_COLOR24, 1, 1)) { throw std::exception("Failed to create CImageList"); } if (!m_imageListS.Create(16,16,ILC_COLOR24, 1, 1)) { throw std::exception("Failed to create CImageList"); } // Fill the CImageLists with items loaded from ResourceIDs int i = 0; for (std::vector<UINT>::iterator it = vec.begin(); it != vec.end(); it++, i++) { CBitmap* bmpBig = new CBitmap(); bmpBig->LoadBitmap(*it); CDC bigDC; bigDC.CreateCompatibleDC(m_itemList.GetDC()); bigDC.SelectObject(bmpBig); CBitmap* bmpSmall = new CBitmap(); bmpSmall->CreateBitmap(16, 16, 1, 24, 0); CDC smallDC; smallDC.CreateCompatibleDC(&bigDC); smallDC.SelectObject(bmpSmall); smallDC.StretchBlt(0, 0, 32, 32, &bigDC, 0, 0, 16, 16, SRCCOPY); m_imageListL.Add(bmpBig, RGB(0,0,0)); m_imageListS.Add(bmpSmall, RGB(0,0,0)); } m_itemList.SetImageList(&m_imageListS, LVSIL_SMALL); m_itemList.SetImageList(&m_imageListL, LVSIL_NORMAL);

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• Qt::X11BypassWindowManagerHint functionality on Windows

  - by Hector

  Hi I'm currently developing a cross-plataform virtual keyboard. In linux i was able to do whatever i want, but in Windows i'm having problems to prevent the widget to obtain the keyboard focus. In linux, using the window flag Qt::X11BypassWindowManagerHint the widget never gets the keyboard input, but of course, that flag does not work on Windows Is there something equivalent to that flag or some method i can use instead? any ideas would be appreciated thanks in advance

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• Foreign keys with Rails' ActiveRecord::Migration?

  - by Earlz

  Hello, I'm new to Ruby on Rails (I know Ruby just decently though) and looking at the Migration tools, it sounds really awesome. Database schemas can finally (easily) go in source control. Now my problem with it. When using Postgres as the database, it does not setup foreign keys. I would like the benefits of foreign keys in my schema such as referential integrity. So how do I apply foreign keys with Migrations?

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