C / C++ / MFC

See http://www.qtcentre.org/threads/2952-QMAKESPEC-has-not-been-set-so-configuration-cannot-be-deduced[^].

Richard MacCutchan5-Jan-14 22:19

Richard MacCutchan

5-Jan-14 22:19

Veni, vidi, abiit domum

Marco Bertschi6-Jan-14 0:12

Marco Bertschi

6-Jan-14 0:12

Source[^]
Most probably the QTDIR environment variable is not set. You can set it in your system [...]

How to set an environment variable[^]

Veni, vidi, caecus | Everything summarizes to Assembly code

Utheen6-Jan-14 0:23

6-Jan-14 0:23

I have set the QTDIR Variable with value D:\Qt\4.8.0
and QMAKESPEC=win32-msvc2008.
Updated PATH variable to include %QTDIR%\bin.
But still it is not possible to build the standalone executable file. On running my exe, it says that mingwm10.dll is missing. On copy pasting the same it asks for another dll QTCore4.dll. Frown | :(

Marco Bertschi6-Jan-14 0:43

Marco Bertschi

6-Jan-14 0:43

Running Qt-Code has some pre-conditions. Try to copy the contents of %QTDIR%\bin into the folder which is your executable is located in and try to run the program again.

Veni, vidi, caecus | Everything summarizes to Assembly code

Utheen6-Jan-14 0:52

6-Jan-14 0:52

But my requirement is like I have to run the exe without copying any dependent dlls like mingwm10.dll.
Is it possible?
I have updated the myproject.pro file with the following code.

static { # everything below takes effect with CONFIG += static
CONFIG += static
CONFIG += staticlib # this is needed if you create a static library, not a static executable
DEFINES += STATIC
message("~~~ static build ~~~") # this is for information, that the static build is done
mac: TARGET = $$join(TARGET,,,_static) #this adds an _static in the end, so you can seperate static build from non static build
win32: TARGET = $$join(TARGET,,,s) #this adds an s in the end, so you can seperate static build from non static build
}

Marco Bertschi6-Jan-14 1:00

Marco Bertschi

6-Jan-14 1:00

Neethu P K wrote:
But my requirement is like I have to run the exe without copying any dependent dlls like mingwm10.dll.

Is it possible?

It certainly is, you need to statically link the Qt dlls into your executable.
Don't ask me how this will exactly work, but you may find further information here:

http://stackoverflow.com/questions/1011197/qt-static-linking-and-deployment[^]
http://www.formortals.com/build-qt-static-small-microsoft-intel-gcc-compiler/[^]
http://harmattan-dev.nokia.com/docs/library/html/qt4/deployment-windows.html[^]

Veni, vidi, caecus | Everything summarizes to Assembly code

Utheen6-Jan-14 2:09

6-Jan-14 2:09

ok thank you. I shall try again. Smile | :)

Gisle Vanem6-Jan-14 21:34

Gisle Vanem

6-Jan-14 21:34

> and QMAKESPEC=win32-msvc2008.

But in the original message you tried to use MingW??

Gisle V.

# rm -vf /bin/laden /bin/rm: success

Utheen7-Jan-14 17:41

7-Jan-14 17:41

I am still having problems to make a static build of QT application Sigh | :sigh:

My exe is not working in any other systems which may or may not have QT. Can anybody help me with exact steps? As a beginner I don't have much idea about this Frown | :(

[SOLVED}stack vs. heap objects: how to destruct only heap ones?

Gisle Vanem7-Jan-14 22:57

Gisle Vanem

7-Jan-14 22:57

You should joint the Qt-interest mailing list interest@qt-project.org
and ask there.

Gisle V.

# rm -vf /bin/laden /bin/rm: success

liquid_4-Jan-14 6:12

liquid_

4-Jan-14 6:12

Suppose we have a class:

C++

class container
{
  public:
    container(sometype *itp)
    {
      item = itp;
    }
    ~container();
  private:
    sometype *item;
};

It's possible to use the class object in these ways:

C++

void function()
{
  sometype item;
  sometype *pitem;

  container ct1(&item);
  pitem = new sometype;
  container ct2(pitem);
}

I'd like to destroy sometype pointer in class's destructor provided it was created on the heap by new operator but not that on the stack. How to make it?

modified 5-Jan-14 0:22am.

Re: stack vs. heap objects

Richard Andrew x644-Jan-14 7:16

Re: stack vs. heap objects

4-Jan-14 7:16

There is no way to tell just by the variable itself, but you could provide a flag to the constructor to indicate the difference:

class container
{
  public:
    container(sometype *itp, bool HeapFlag)
    {
      item = itp;
      Flag = HeapFlag;
    }
    ~container();
    {
      if (Flag)
         delete item;
    }
  private:
    sometype *item;
    bool Flag;
};

The difficult we do right away...
...the impossible takes slightly longer.

liquid_4-Jan-14 11:28

liquid_

4-Jan-14 11:28

I think I've just found pretty good solution which, however, may not work well in multithreaded environment. Let's add a static variable bool heapcreated, a flag createdflag and overload operator new. That would look like this:

C++

class sometype
{
  protected:
    static bool heapcreated;
    bool createdflag;
  public:
    sometype()
    {
      createdflag = heapcreated;
      heapcreated = false;
    }
    bool IsHeapCreated()
    {
      return createdflag;
    }
    void *operator new(size_t n)
    {
      sometype *stp=::new sometype;

      heapcreated = true;
      return stp;
    }
  
class container
{
  public:
    container(sometype *itp)
    {
      item = itp;
    }
    ~container();
    {
      if (item->IsHeapCreated())
         delete item;
    }
  private:
    sometype *item;
};

The new destructor of container would behave different depending on mode of sometype creation. I've searched this solution to be used when you build a library and you do not want a caller to have to do an overhead work adding a flag parameter. If you had to make many calls to container constructor with pointers to sometype it would be slightly difficult to save somewhere the pointers and then delete them. Also, you should be able to pass a pointer to stack variable which must not be deleted explicitly.
It's a bit tricky but my simple test works.

Re: stack vs. heap objects

Richard Andrew x644-Jan-14 13:34

[SOLVED] Toolbar style window

4-Jan-14 13:34

Good on you! That's a clever solution. Smile | :)

The difficult we do right away...
...the impossible takes slightly longer.

Richard Andrew x643-Jan-14 3:09

image processing toolkits | batch image processing

3-Jan-14 3:09

I was able to find the answer to this question at the end of this post:
http://social.msdn.microsoft.com/Forums/vstudio/en-US/3c4c722d-eecd-49ce-98f9-5948b656bd93/wsextoolwindow-doesnt-give-look-i-want-in-windows-8?forum=vcgeneral[^]
=========
I am creating a window with the WS_EX_TOOLWINDOW style on Windows 8, and the window ends up with the full-height title bar instead of the expected half-height title bar of a tool window.

Does Windows 8 not support this half-height title bar for tool windows, or am I doing something wrong?

Here is the window creation:

C++

hWnd = CreateWindowEx(WS_EX_TOOLWINDOW | WS_EX_TOPMOST, _TEXT("Class"), _TEXT("Caption"), WS_SYSMENU | WS_VISIBLE | WS_SIZEBOX | WS_CLIPCHILDREN | WS_CLIPSIBLINGS, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

EDIT:

I just tested this in a Win 7 virtual machine, and I get the expected half-height title bar, so apparently this has something to do with Windows 8. Does anyone have any idea how to get the half-height title bar in Windows 8?

The difficult we do right away...
...the impossible takes slightly longer.

modified 3-Jan-14 9:37am.

Deleting Files

BobInNJ2-Jan-14 8:25

BobInNJ

2-Jan-14 8:25

I am working on a Windows program in C++ that downloads a variable number of files into a directory. Before I do the download, I want to delete all the files in the directory before downloading them. I do not want to write a separate script to do this. I want the C++ program to do it. What is the easiest way to do this?

Bob

Re: Deleting Files

C^hris L^osinger2-Jan-14 9:58

C^hris L^osinger

2-Jan-14 9:58

something like this Delete folders, subfolders and files easily[^] (be sure to read the comments for fixes to the article)

Re: Deleting Files

David Crow3-Jan-14 4:24

David Crow

3-Jan-14 4:24

BobInNJ wrote:
What is the easiest way to do this?

I suppose SHFileOperation() would be.

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Re: Deleting Files

BobInNJ6-Jan-14 3:55

BobInNJ

6-Jan-14 3:55

Thanks for the responses. Based upon the responses I received I was able to write the code I wanted.

Bob

Get the mouse position

Richard Andrew x6431-Dec-13 19:43