C / C++ / MFC Discussion Boards

Niklas L2-Mar-11 5:54

2-Mar-11 5:54

You can add images that are wider than your set up 16 pixels, but not narrower. A wider image will be clipped to fit the width. A narrower image will be rejected. Check CImageList::GetImageCount() after you have added an image to see if it was accepted. (Don't trust the return value of CImageList::Add() for this.)

You will have to add space to your thumbnail Smile | :)

home

Re: Image::GetThumbnailImage() issue [modified]

David Crow2-Mar-11 6:18

David Crow

2-Mar-11 6:18

Niklas Lindquist wrote:
You will have to add space to your thumbnail

Any reading suggestions for this?

[edit]
I found what I was looking for with Graphics::FromImage() and Graphics::DrawImage(). Thanks!
[/edit]

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"Some people are making such thorough preparation for rainy days that they aren't enjoying today's sunshine." - William Feather

modified on Wednesday, March 2, 2011 2:17 PM

Re: Image::GetThumbnailImage() issue

Niklas L2-Mar-11 8:45

Niklas L

2-Mar-11 8:45

I was going to suggest this:

C++

CImage img;
img.Load("narrow.bmp");

COLORREF clrFill = RGB(255, 255, 255);
int leftEdge = (16 / 2) - img.GetWidth() / 2;

CDC *pDC = GetDC();
CDC dc;
dc.CreateCompatibleDC(pDC);
ReleaseDC(pDC);
CBitmap bm;
bm.CreateBitmap(16, 16, 1, 32, NULL);
BITMAP bitmap;
bm.GetBitmap(&bitmap);
CBitmap *pOldBm = dc.SelectObject(&bm);
dc.FillSolidRect(0, 0, 16, 16, clrFill);

 // either
 img.BitBlt(dc.m_hDC, leftEdge, 0, SRCCOPY);
 // or
 img.Draw(dc.m_hDC, leftEdge, 0);

dc.SelectObject(pOldBm);
imagelist.Add(&bm, clrFill);

bus I suppose gdi+ has more to offer.

home

Registering a 64 bit DLL from a 32 bit application

Rajesh R Subramanian1-Mar-11 4:31

Rajesh R Subramanian

1-Mar-11 4:31

Hi all,

I've a 32 bit DLL that needs to register 2 other DLLs. One of these DLLs are 64 bit, and another is 32 bit. I know that I can simply load the DLL and call DllRegisterServer for the 32 bit DLL.

However, I am not sure how can I proceed with registering the 64 bit DLL. There are several ways like:

1. RegSvr32.exe [DLL name here]
2. RunDll32.exe [Dll name here] [DllRegisterServer]
and so on...

However, windows is forcing file system virtualisation upon my process since it's 32 bit, and the calls to the above executables are invoking the corresponding 32 bit versions (from within C:\Windows\SysWOW64), even if I hardcode the path to C:\Windows\System32 (where the 64 bit versions reside). And because the 32 bit versions of those applications are called, they fail to load my 64 bit DLL.

Is there a way to temporarily disable WOW from within my code, so that I can actually execute the 64 bit version of those applications? Or is there any other workaround?

Note: I do not want to build a 64 bit version of this particular DLL (the one which wants to do all the registration).

Any help will be appreciated. Thanks!

"Real men drive manual transmission" - Rajesh.

Re: Registering a 64 bit DLL from a 32 bit application

Richard Andrew x641-Mar-11 7:59

Richard Andrew x64

1-Mar-11 7:59

See if this is useful:

Wow64DisableWow64FsRedirection[^]

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

Re: Registering a 64 bit DLL from a 32 bit application

Rajesh R Subramanian1-Mar-11 8:36

Rajesh R Subramanian

1-Mar-11 8:36

I don't have VS installed on this machine now to test it. However, I'm fairly sure that this should be a straight forward way of resolving my problem by bypassing the WOW mode!

Many thanks! Smile | :)

"Real men drive manual transmission" - Rajesh.

Re: Registering a 64 bit DLL from a 32 bit application

Rajesh R Subramanian1-Mar-11 23:18

Rajesh R Subramanian

1-Mar-11 23:18

I also have realised that I could call SHGetFolderPath() by passing in the appropriate CSIDL (in my case, it is 32 bit process running in WOW mode on 64 bit windows):

CSIDL_SYSTEM to retrieve the 64 bit system32 folder
CSIDL_SYSTEMX86 to retrieve the WOW mode system32 folder

Note that this applies only for a 64 bit operating system. If the OS is 32 bit, then both the above calls will return %windir%\System32, because there's no WOW mode.

More information can be found in this MSDN page: http://msdn.microsoft.com/en-us/library/dd378457(v=VS.85).aspx[^]

With this way, I was able to execute both versions of regsvr32 without having to by pass the WOW file system redirection!

"Real men drive manual transmission" - Rajesh.

How to check if a string is base64 encoded string?

rahul.kulshreshtha28-Feb-11 18:06

rahul.kulshreshtha

28-Feb-11 18:06

How can I check if a string is base64 encoded string? OMG | :OMG:

Re: How to check if a string is base64 encoded string?

Cool_Dev28-Feb-11 18:29

Cool_Dev

28-Feb-11 18:29

Manually check whether the string contains only the characters (A-Z, a-z, , 0-9, + and /) that can be the output of Base64 encoding. Such a string can be successfully decoded. Cool | :cool:

Re: How to check if a string is base64 encoded string?

rahul.kulshreshtha28-Feb-11 20:11

rahul.kulshreshtha

28-Feb-11 20:11

thanks

Re: How to check if a string is base64 encoded string?

Hans Dietrich28-Feb-11 18:33

Hans Dietrich

28-Feb-11 18:33

1. Check if the length is an exact multiple of 4.

2. Try to decode it and catch any error.

Best wishes,
Hans

[Hans Dietrich Software]

Re: How to check if a string is base64 encoded string?

rahul.kulshreshtha28-Feb-11 20:11

rahul.kulshreshtha

28-Feb-11 20:11

thanks

Re: How to check if a string is base64 encoded string?

CPallini28-Feb-11 23:15

CPallini

28-Feb-11 23:15

Can't understand why someone downvoted this.

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]

Get Volume Name From Path

Richard Andrew x6428-Feb-11 17:31

Richard Andrew x64

28-Feb-11 17:31

Is there already a function in Windows that can extract just the volume name from a fully qualified path?

For example:

C:\Path1\path2

should return

"C:\"

and

\\MyServer\MyShare\text.txt

should return

"\\MyServer\MyShare\"

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

Re: Get Volume Name From Path

Richard Andrew x6428-Feb-11 17:44

Richard Andrew x64

28-Feb-11 17:44

I found it:

GetVolumePathName()

Retrieves the volume mount point where the specified path is mounted.

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

Re: Get Volume Name From Path

Hans Dietrich28-Feb-11 17:44

Hans Dietrich

28-Feb-11 17:44

_splitpath

Best wishes,
Hans

[Hans Dietrich Software]

Re: Get Volume Name From Path

Niklas L1-Mar-11 0:43

Niklas L

1-Mar-11 0:43

PathStripToRoot()[^] might also be of interest.

home

Re: Get Volume Name From Path

Hans Dietrich1-Mar-11 1:23

Hans Dietrich

1-Mar-11 1:23

Wow. Another API I have never heard of. Thumbs Up | :thumbsup:

How do you find this stuff?

Best wishes,
Hans

[Hans Dietrich Software]

Re: Get Volume Name From Path

Niklas L1-Mar-11 1:47

Niklas L

1-Mar-11 1:47

There's a whole set of path handling functions[^]. A lot more than you would ever need... Smile | :)

home

MFC command line in VC6.0 - repost

Vaclav_28-Feb-11 4:07

Vaclav_

28-Feb-11 4:07

I am experimenting with different releases of OpenCV and would like to document command line options.
Is there a simple way to see / print all command line options in use in MFC workspace ( Project _ Settings)?
Thanks for reading.
Vaclav

Re: MFC command line in VC6.0 - repost

Hans Dietrich28-Feb-11 4:50

Hans Dietrich

28-Feb-11 4:50

The simplest way is to go to Project | Settings | C/C++ and copy/paste the text box at the bottom of that tab, "Project Options". You could also probably find this info in the project .dsp file.

Best wishes,
Hans

[Hans Dietrich Software]

SOLVED Re: MFC command line in VC6.0 - repost

Vaclav_28-Feb-11 6:00

Vaclav_

28-Feb-11 6:00

Thanks, it is in *.dsp file

How can handle double click event in listctrl of checkbox style?

Le@rner27-Feb-11 22:32

Le@rner

27-Feb-11 22:32

Hi all,

i m using ListCtrl with Checkbox option.

i m popup a message on double click of list item and i want the message not pop up on double click on ckeck box of this item .

please tell me how can i do this.

thanks in advance.

Re: How can handle double click event in listctrl of checkbox style?

Hans Dietrich27-Feb-11 22:51

Hans Dietrich

27-Feb-11 22:51

The solution to this is the NM_DBLCLK notification message; for more info see here: http://msdn.microsoft.com/en-us/library/bb774867%28v=vs.85%29.aspx[^]

Here is a code snippet:

void MyDlg::OnDblClick(NMHDR* pNMHDR, LRESULT* pResult)
{
    LPNMITEMACTIVATE pNMIA = reinterpret_cast<LPNMITEMACTIVATE>(pNMHDR);

    int nItem = -1;
    int nSubItem = -1;

    if (pNMIA)
    {
        nItem = pNMIA->iItem;
        nSubItem = pNMIA->iSubItem;
    }

    if (nItem >= 0 && nSubItem >= 0)
    {
        CString strText = m_List.GetItemText(nItem, nSubItem);
        TRACE(_T("OnDblClick at (%d,%d):  '%s'"), nItem, nSubItem, strText);
    }

    *pResult = 0;
}

The message map entry looks like:

ON_NOTIFY(NM_DBLCLK, IDC_LIST, OnDblClick)

This gives you the sub-item of the click, and from that you can tell whether the checkbox column was clicked.

Best wishes,
Hans

[Hans Dietrich Software]

Re: How can handle double click event in listctrl of checkbox style?

Le@rner27-Feb-11 23:13

Le@rner

27-Feb-11 23:13

i am asking how can skip to pop up the message box on double click on check box in list ctrl.

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