C / C++ / MFC Discussion Boards

Re: Activex control in linux

CPallini11-Jan-11 2:49

CPallini

11-Jan-11 2:49

You cannot do that.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: Activex control in linux

Sakhalean11-Jan-11 3:01

Sakhalean

11-Jan-11 3:01

ok thank you.

Re: Activex control in linux

Cool_Dev11-Jan-11 2:50

Cool_Dev

11-Jan-11 2:50

activeX and linux? Frown | :(

Listing Unused Variables

softwaremonkey11-Jan-11 2:31

softwaremonkey

11-Jan-11 2:31

HI,

Does anyone know of any free tools or Visual Studio add-in that will check the source files in a project for unused variables and/or functions?

Thumbs Up | :thumbsup:

Tony

Re: Listing Unused Variables

Maximilien11-Jan-11 2:41

Maximilien

11-Jan-11 2:41

Set the compiler warning level to 4.

Watched code never compiles.

Re: Listing Unused Variables

Luc Pattyn11-Jan-11 3:12

Luc Pattyn

11-Jan-11 3:12

AFAIK that works well for local variables, but not for class level variables or methods.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.

Re: Listing Unused Variables

Maximilien11-Jan-11 6:34

Maximilien

11-Jan-11 6:34

I still don't understand why people write unused code!! Roll eyes | :rolleyes:

Watched code never compiles.

Re: Listing Unused Variables

Luc Pattyn11-Jan-11 6:46

Luc Pattyn

11-Jan-11 6:46

Don't blame the programmers. Blame the users, they tend to avoid those pieces of an app that contain most of the bugs.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.

Re: Listing Unused Variables

Cool_Dev11-Jan-11 2:47

Cool_Dev

11-Jan-11 2:47

can't you compile with warning Level 4 in Project->Properties->C/C++->General->Warning Level -> Level 4 (/W4) ?

Re: Listing Unused Variables

softwaremonkey11-Jan-11 3:04

softwaremonkey

11-Jan-11 3:04

Thanks for the reply.

Yea, I have used warning level 4 to identify any unused local variables but I was thinking of something on a bigger scale i.e. something that would identify class members and methods which are not referenced in the project.

Of couse I could right click every method in the class view and show where it is called but that could drive a man insane!

Thanks again for the reply. Thumbs Up | :thumbsup:

Re: Listing Unused Variables

Yusuf11-Jan-11 3:31

Yusuf

11-Jan-11 3:31

Check Doxygen. It has been very long since I used it, but it may help dig out something. I know there is something with unused function, but not sure for unused variables.

I could be way off the mark, it has been very long since I used it.

Yusuf
May I help you?

Custom member variable

mesajflaviu11-Jan-11 0:22

mesajflaviu

11-Jan-11 0:22

One biggest problem of the most article from here , is that is not tested on static and dynamic mode : here [^] I use this control , of type CCheckComboBox , on CFormView form .... but when I try to use it into an dialog bar , I broke down ... how can I do that ? How can I put into dialog bar the member variable type of CCheckComboBox ?

Re: Custom member variable

CPallini11-Jan-11 0:26

CPallini

11-Jan-11 0:26

I'm pretty sure the article's author would consider precious your comments, just post them in the article's own thread.
Smile | :)

Re: Custom member variable

bleedingfingers11-Jan-11 0:58

bleedingfingers

11-Jan-11 0:58

People are not only thankless but also so unforgiving of the mistakes committed even by a baby. Mad | :mad:

...byte till it megahertz...

my donation to web rubbish

Re: Custom member variable [modified]

mesajflaviu11-Jan-11 1:39

mesajflaviu

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

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