Re: _fstat() without File Descriptor - C / C++ / MFC Discussion Boards

mesajflaviu11-Jan-11 1:39

11-Jan-11 1:39

I'm sorry , I was bad ... my apologize .. I will comment that in the article's page .

I was need right now to use this control , but I will use something else ... Frown | :(

modified on Tuesday, January 11, 2011 8:54 AM

Re: Custom member variable

mesajflaviu12-Jan-11 4:56

mesajflaviu

12-Jan-11 4:56

I know that all people that write articles here have do an good and altruistic thing ... bleedingfingers show me how small I am ... mea culpa !

Image Transparency saving but Not showing.

002comp10-Jan-11 20:37

002comp

10-Jan-11 20:37

Hello Friends
I saved a Image with some transparency state by using Colormatrix And ImageAttribues In GDIplus.And that image is saving with actual value of transparency.But when I load that image and add it to devicecontext then its transparency is not coming there(Means If i set transparency 0 then black image is coming And If I set 1 then also white is coming but If I set any other value Between 0 And 1 then that transparency level is not coming ,It is showing completely white for >0)

Any Ideas?
Thanks & Regards
Yogesh

Re: Image Transparency saving but Not showing.

jk chan11-Jan-11 0:46

jk chan

11-Jan-11 0:46

In which format you saved image ? 32 bpp bitmap or PNG ? in that case it is fine.

which function you use to draw the image ? if you use DrawImage function in gdiplus with a 32bit bmp ,it will work for sure.

If u can Dream... U can do it

Re: Image Transparency saving but Not showing.

002comp11-Jan-11 1:01

002comp

11-Jan-11 1:01

I save the image in 32bitFormat as Tiff and am using DrawImage to draw the Image.

Thanks
Yogesh

_fstat() without File Descriptor

gomathylakshmanan10-Jan-11 19:49

gomathylakshmanan

10-Jan-11 19:49

Hi all,

I am working on VS10 Porting project.

Here they are using _fstat(infile.rd(), &instat).

This function is used to obtain information of the opened file associated with the

File descriptor.The first parameter in this function is File descriptor.

But,File descriptor is not available in VS10.

So,How can we use this function without File descriptor?

Please help me to solve this issue.

Thanks.

Re: _fstat() without File Descriptor

Andrew Brock10-Jan-11 20:07

Andrew Brock

10-Jan-11 20:07

according to http://msdn.microsoft.com/en-us/library/221w8e43(v=vs.100).aspx[^] file descriptors still work in VS10.

Pasting the example code into a new Win32 Console project in Visual Studio 2010 Ultimate worked fine for me.

Re: _fstat() without File Descriptor

Andrew Brock10-Jan-11 23:31

Andrew Brock

10-Jan-11 23:31

Sorry, I found your earlier question in which you said it was an ifstream that you were using.
From what I can see there is no way of getting anything useful toward a file handle out of the ifstream, short of making a hack for it.
I would recommend using functions like CreateFile and GetFileSize using handles or just opening the file a second time with _open(name, _O_RDONLY, _SH_DENYNO) depending on what information you are wanting.

If you really really want to stick with ifstream, then this is a hack that will get the file descriptor out for the version I have. It may be different than your version due to hotfixes.

//Get the FileBuffer out of the ifstream
ifstream::_Myfb *pFileBuffer =  infile.rdbuf(); 
//Convert that to a series of bytes
char *pFileBufferMemory = (char *)(void *)pFileBuffer;
//the FILE * is the last member in the _Myfb class, seek to the end of the memory and step back sizeof(FILE *)
FILE **pFilePtrPtr = (FILE **)(pFileBufferMemory + sizeof(ifstream::_Myfb) - sizeof(FILE *));
//dereferance the memory pointer
FILE *pFilePtr = *pFilePtrPtr; 
//get the file descriptor from the FILE *. Equivelent to pFilePtr->_file;
int nFileDescriptor = _fileno(pFilePtr); 

//do the above in 1 line of code
int nFileDescriptor2 = _fileno(*(FILE **)(((char *)(void *)infile.rdbuf()) + sizeof(ifstream::_Myfb) - sizeof(FILE *)));

Getting ERROR_INSUFFICIENT_BUFFER error in DeviceIoControl Function

learningvisualc10-Jan-11 18:49

learningvisualc

10-Jan-11 18:49

Hi all,

I am trying to get Logical drives of a hard disk(\\.\PhysicalDrive0).

I have tried using DeviceIoControl function for it but i am getting GetLastError() = 122 i.e. ERROR_INSUFFICIENT_BUFFER error.
My code is as follows:-

HANDLE hDevice;

	hDevice = CreateFile("\\.\PhysicalDrive0"    // drive 
                              0,                    // no access to the drive
                              FILE_SHARE_READ |    // share mode
                              FILE_SHARE_WRITE, 
                              NULL,              // default security attributes
                              OPEN_EXISTING,    // disposition
                              0,               // file attributes
                              NULL);          // do not copy file attributes



	PARTITION_INFORMATION_EX obj;
	DWORD cb;
	

	BOOL iu = DeviceIoControl(hDevice,                             // handle to a partition
				  IOCTL_DISK_GET_PARTITION_INFO_EX,   // dwIoControlCode
				  NULL,                              // lpInBuffer
				  0,                                // nInBufferSize
				  &obj,			           // output buffer
				  sizeof(obj),                    // size of output buffer
				  &cb,                           // number of bytes returned
				  NULL                          // OVERLAPPED structure
				 );
	if(iu == 0)
	{
		DWORD err = GetLastError();
		CString str;
		str.Format("%d",err);
		AfxMessageBox(str);
	}
	CloseHandle(hDevice);

I am not getting where exactly is the problem...
How can i do this..
Thanks in advance

Re: Getting ERROR_INSUFFICIENT_BUFFER error in DeviceIoControl Function

Andrew Brock10-Jan-11 19:57

Andrew Brock

10-Jan-11 19:57

Not sure if it is just the way u copied it to code project, but you need to escape each of the back slashes in the drive name like "\\\\.\\PhysicalDrive0"
also add a comma in after that string. Once I applied those changes your code worked for me.

Font in CWnd

includeh1010-Jan-11 17:31

includeh10

10-Jan-11 17:31

I created a CWnd control with widow styles WS_CHILD|WS_VISIBLE (parent is a CWnd also), then set a new CFont to the control by SetFont(...) function.

But, when called
CFont*pFt=GetFont();
inside the CWnd control, return value of pFt is null.

Should I add more window styles?
How do you set a font to CWnd to ensure that GetFont() is valid?

BTW: I tested to create a CStatic, GetFont() is still null;

modified on Monday, January 10, 2011 11:39 PM

Re: Font in CWnd

Richard MacCutchan10-Jan-11 23:28

Richard MacCutchan

10-Jan-11 23:28

See comments here[^] about the return value from the WM_GETFONT message.

I must get a clever new signature for 2011.

Re: Font in CWnd

User 742933810-Jan-11 23:47

User 7429338

10-Jan-11 23:47

Additionally, it will return 0 too when called on a control/window that doesn't exist (yet/anymore/at all).

modified 13-Sep-18 21:01pm.

Re: Font in CWnd

User 742933810-Jan-11 23:43

User 7429338

10-Jan-11 23:43

At which point do you call GetFont? Does the window already/still exist at that point?

Calling it from within OnCreate() should be safe to ensure the font has been set.

modified 13-Sep-18 21:01pm.

Re: Font in CWnd

jk chan11-Jan-11 0:48

jk chan

11-Jan-11 0:48

Just call GetFont immediately after SetFont, so that we can test whether the problem is with invalid window handle. For a valid window handle it must work.

If u can Dream... U can do it

using ADO to get a clob out value through store procedure in oracle

white jungle10-Jan-11 15:55

white jungle

10-Jan-11 15:55

Hi there:
I am trying to get a clob data via store procedure in oracle db by using ADO . But I don't know how many bytes should I allocated for the buffer to hold the clob out value. Is there a convenient way to get the clob out value properly ?
I googled and found some guys say that ADO.Stream can be used on this problem but I failed to find how to use ADO.stream in

Thanks a lot.

----------
Don't look at me in that way!

Refresh/redraw controls in CFormView

jaknupp10-Jan-11 11:17

jaknupp

10-Jan-11 11:17

I have a CFormView with 2 CStatic bitmaps used for backgrounds. One has an ActiveX graph control above it and the other has another bitmap. Z order is set so background bitmaps are on the bottom. Clip children and clip siblings are set. When first displayed everything looks good. After minimize/restore or covered by another window the background bitmaps display above the other controls.

To test I added a button and have the handler in CFormView that does m_graph.Invalidate() and m_foregroundbitmap.Invalidate(). When pushed the graph and forground bitmap display correctly. I also tried having the button handler just do Invalidate() (for the form view) which also displays correctly. Putting Invalidate() in any other handler (i.e. OnSize, OnActivate) doesn't work. It seems that the graph and foreground bitmap update but then the background bitmaps update and draw over the others. Setting Invalidate() in OnParentNotify() from the graph control does work but unless the mouse is over the control there's no notify messages so no update. I've also tried SetWindowPos(&CWnd::wndTopMost... which didn't seem to change anything.

Are there any ideas on what I might be missing or maybe another way to have controls over an image? (I need the background image because it gives a quick view to what changed in the control.) Thanks,

John

Re: Refresh/redraw controls in CFormView

KingsGambit10-Jan-11 19:18

KingsGambit

10-Jan-11 19:18

Z-Order for the child controls will not work for displaying a child window on the top of another.
What you can do is instead of using a CStatic control for displaying the bitmap, you can render the bitmap directly on to the parent window.

Convert Windows application to Linux application

Stephane-M10-Jan-11 4:01

Stephane-M

10-Jan-11 4:01

My flight simulation club is working on the development on an opensource flight simulator (Fly! Legacy) under GPL license.
http://sourceforge.net/projects/flylegacy/[^]

Currently, only a Windows version of this software is available and so, one or several people would be necessary (because the current developers are very busy at the time) to help us to convert this Windows application to a Linux application.
The application is developed in C++ and is compiled with Visual Studio 2008.
About the librairies included in the project, I don't know all because I'm not developer of the project but I can tell you that uses:
_ OpenGL
_ OpenAL
_ FreeImage
_ OPAL-ODE
_ Glew
_ PThread
_ STLport (not sure)
Could you help us ?
Thank you for your cooperation.

Re: Convert Windows application to Linux application

User 742933810-Jan-11 4:07

User 7429338

10-Jan-11 4:07

I see the goal of the project, but what exactly is the problem?

Also, is it necesary to convert the project to Linux? Running it in an emulator is not a viable option?

modified 13-Sep-18 21:01pm.

Re: Convert Windows application to Linux application

Stephane-M10-Jan-11 4:17

Stephane-M

10-Jan-11 4:17

The problem is that we have a lack of developers on the project and as the result, those who developed the project at the moment don't have the opportunity to convert the Windows application into a Linux one, because they are working on more important priorities (like the creation of a 1st aircraft).
I heard that this task would be pretty fast to do (a couple of days), but for the moment, we don't know anybody who have the skills to work on this.
Unfortunately, an emulation solution (Wine, even a virtual machine) was rejected by the developers, mainly for performances reasons.

Re: Convert Windows application to Linux application

User 742933810-Jan-11 4:41

User 7429338

10-Jan-11 4:41

I meant, what is the programming problem? Smile | :)

Or should the question be seen as a request to do the full conversion project for you?

modified 13-Sep-18 21:01pm.

Re: Convert Windows application to Linux application

Stephane-M10-Jan-11 23:09

Stephane-M

10-Jan-11 23:09

There is no programming problem.
Indeed, if we could find someone who would accept to do the conversion for us, that would be perfect.

Re: Convert Windows application to Linux application

Richard MacCutchan10-Jan-11 23:23

Richard MacCutchan

10-Jan-11 23:23

Stephane-M wrote:
if we could find someone who would accept to do the conversion for us, that would be perfect.

In that case you should post in the appropriate forum; your question has nothing to do with C/C++.

I must get a clever new signature for 2011.

Re: Convert Windows application to Linux application

Stephane-M11-Jan-11 2:15

Stephane-M

11-Jan-11 2:15

It's done.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.