Re: CImage and VC++ 6 - C / C++ / MFC Discussion Boards

kcynic4-Dec-07 15:01

4-Dec-07 15:01

Hello everyone.In my program,I want to change a file's content,so I create a create file to copy data from source file and write new data,too.
When all file reading and writing completed,I want to delete the source file and rename the temp file to the source file name.If the source file path is sourcePath,and the temp file path is tempPath,my codes look like following:
if(remove(sourcePath)==0)//sourcePath is the full path of the source file
rename(tempPath,sourcePath);
Of course,the source and temp file are in the same directory.

But it is strange that,if i separate the codes as a short test console project,it works well!
Someones would like to tell me why?
Thanks.

GOOD LUCK

Re: why rename would fail sometimes?

David Crow4-Dec-07 16:51

David Crow

4-Dec-07 16:51

kcynic wrote:
But it is strange that,if i separate the codes as a short test console project,it works well!
Someones would like to tell me why?

If rename() is failing, check errno.

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: why rename would fail sometimes?

Hamid_RT4-Dec-07 18:16

Hamid_RT

4-Dec-07 18:16

Are you sure path is correct?

Unwanted control characters in a CString

Tom Paronis4-Dec-07 13:36

Tom Paronis

4-Dec-07 13:36

Hello. I'm trying to parse some web data with the following code. It's going reasonably well, but I seem to get control characters (little squares) in the CString, making the parsing more difficult. If they're on the end I can use Trim() to remove them, but if they're in the middle it's more problematic. Since I can't represent them with the keyboard it's difficult to use the Span functions. Does anyone have any suggestions? Thank you.

IHTMLElement* pElem;
hr = pHTMLDocument2->get_body( &pElem );

if ( hr == S_OK && pElem != NULL )
{
pElem->get_innerText(&bstr);
CString strInnerText = bstr;
ScrapeFuturesSettlementData( strInnerText );
}
pHTMLDocument2->Release();
Tom

Re: Unwanted control characters in a CString

David Crow4-Dec-07 16:43

David Crow

4-Dec-07 16:43

Do you know the ASCII value of said "square" characters?

Calling CreateProcessAsUser from service on to Winsta0//winlogon desktop in Vista.

Ronakkumar Patel4-Dec-07 9:18

Ronakkumar Patel

4-Dec-07 9:18

Is this possible to do and how?

I went through this thread and still not able to find out how to do it on Vista

http://forums.microsoft.com/MSDN/ShowPost.aspx?PageIndex=1&SiteID=1&PageID=1&PostID=404082#404082[^]

http://www.uvnc.com/vista/[^]

CImage and VC++ 6

RomTibi4-Dec-07 9:11

RomTibi

4-Dec-07 9:11

How to load a image from a file and show it with a dialog box in VC++ 6? Confused | :confused:

36. When you surround an army, leave an outlet free.
...
Do not press a desperate foe too hard.

SUN-TZU - Art of War

Re: CImage and VC++ 6

David Crow4-Dec-07 10:34

David Crow

4-Dec-07 10:34

If you are using MFC, and your dialog template has a static control on it, check out CStatic::SetBitmap(). Otherwise, if you want the image to be the dialog's background, see here.

modified on Wednesday, December 05, 2007 8:57:09 AM

Re: CImage and VC++ 6

Hamid_RT4-Dec-07 18:20

Hamid_RT

4-Dec-07 18:20

Or you can use of WM_ERASEBKGND.

Adding WM_VSCROLL to message handler for slider control in VS 2005 with C++ and MFC

GrizzlyDoug4-Dec-07 8:04

GrizzlyDoug

4-Dec-07 8:04

In trying to add WM_VSCROLL to message handler for slider control in VS 2005 with C++ and MFC, I ran into problem that the slider only supports 4 NMXXXXXXXXX messages or events. What wizards and tabs/menu selections do I choose to get to a place where I can add the WM_VSCROLL message handler to handle messages for the slider so I can get access to it's current value. This is probably an easy thing to do, but it seems like it has gotten more difficult since access to all the messages has been limited, leaving only a very small subset.

GrizMan

Re: Adding WM_VSCROLL to message handler for slider control in VS 2005 with C++ and MFC

Mark Salsbery4-Dec-07 8:31

Mark Salsbery

4-Dec-07 8:31

The messages are sent to the trackbar control's parent by default.

You could right click the parent window class in the class view window,
choose properties, select the messages tab in the properties window,
and add the WM_VSCROLL handler there.

Mark

Mark Salsbery
Microsoft MVP - Visual C++

Java | [Coffee]

GDI+ samples and malloc/free [modified]

bob169724-Dec-07 7:16

bob16972

4-Dec-07 7:16

In the MSDN source code for some GDI+ methods, the authors use malloc and free. Why would they do this if RectF is a class? Is this a hint that it is merely the equivalent to a struct with the ctor and dtor doing nada? Should we follow this convention or use new/delete instead?

Here's an example for GetRegionScans()...

VOID Example_GetRegionScansRect(HDC hdc)
{
   Graphics graphics(hdc);
   SolidBrush solidBrush(Color(255, 255, 0, 0));
   Pen pen(Color(255, 0, 0, 0));
   GraphicsPath path;
   Matrix matrix;
   Rect* rects = NULL;
   INT count = 0;  

   // Create a region from a path.
   path.AddEllipse(10, 10, 50, 300);
   Region pathRegion(&path);    
   graphics.FillRegion(&solidBrush, &pathRegion);

   // Get the rectangles.
   graphics.GetTransform(&matrix);
   count = pathRegion.GetRegionScansCount(&matrix);
   rects = (Rect*)malloc(count*sizeof(Rect));
   pathRegion.GetRegionScans(&matrix, rects, &count);  

   // Draw the rectangles.
   for(INT j = 0; j < count; ++j)
      graphics.DrawRectangle(&pen, rects[j]);

   free(rects);
}

modified on Tuesday, December 04, 2007 1:45:44 PM

Re: GDI+ samples and malloc/free

David Crow4-Dec-07 7:22

David Crow

4-Dec-07 7:22

bob16972 wrote:
Why would they do this if RectF is a class?

Does its constructor/destructor do anything?

Keep in mind that just because it's an MSDN sample, that does not imply it's also perfect code. Folks that supply samples to MSDN are not infallible. MSDN does provide lots of great code, some of which can be used unaltered, but it should still be scrutinized regardless.

Re: GDI+ samples and malloc/free

bob169724-Dec-07 7:41

bob16972

4-Dec-07 7:41

DavidCrow wrote:
Does its constructor/destructor do anything?

I'm not sure the GDI+ source code is available for inspection (except the declaration files of course)

DavidCrow wrote:
Keep in mind that just because it's an MSDN sample, that does not imply it's also perfect code. Folks that supply samples to MSDN are not infallible. MSDN does provide lots of great code, some of which can be used unaltered, but it should still be scrutinized regardless.

I understand what your saying. I was scrutinizing it and I couldn't determine why they were doing it. I thought I'd post the question to see if it made sense to anybody and if they could explain what benefits the author is realizing here or if the code is flawed.

Thanks for the input.

Re: GDI+ samples and malloc/free

DoomedOne4-Dec-07 9:20

DoomedOne

4-Dec-07 9:20

Hi, I gess is using malloc and free to avoid a loop for alocation a "count" number of Rect objects, alocation all of them in one malloc

look at

malloc(count*sizeof(Rect)<code> parameter of malloc.<br />
<br />
<br />
<br />

dll using in VB or VC#

kingday4-Dec-07 7:09

kingday

4-Dec-07 7:09

Hi
there is a dll with cpp and h and lib file that is usable in VC++ we need to define it and use it in VB or VC# please help me.
Best regards

Re: dll using in VB or VC#

CPallini4-Dec-07 9:22

CPallini

4-Dec-07 9:22

Have a look at http://msdn2.microsoft.com/en-us/library/26thfadc.aspx[^]
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.

Alternatives to IExpress?

chaiguy13374-Dec-07 5:44

chaiguy1337

4-Dec-07 5:44

Does anyone know of any free alternatives to using iexpress.exe to package an installer/msi into a self-extracting/self-installing executable? I've been using iexpress until I upgraded to Vista/VS2008 and now whenever I run a package I get the error "This installation package could not be opened. Verify that the package exists and that you can access it, or contact the application vendor to verify that this is a valid Windows Installer package." Mad | :mad:

{o,o}.oO( Did somebody say MouseDown? )
|)””’)
-”-”-

Re: 2D Tree Visualisation

Lea Hayes4-Dec-07 3:14

Lea Hayes

4-Dec-07 3:14

Hi,

I am working on an application which generates a tree data structure. Whilst this can be presented to the user using the standard windows tree control; I feel that the data would be best represented as a heirarchy:

(please ignore initial dots)

.....[ ]<br />
..../  |  \<br />
..[ ][ ][ ]

I have been searching the net extensively for an algorithm which computes the output rectangle for each node. I have not been able to find anything of use; however on one website somebody mentioned Walker's algorithm.

It would be great if somebody could either explain or refer me to a useful resource which details how this could be achieved.

I intend to use the MFC framework when drawing the tree.

Any advice would be greatly appreciated!

Lea Hayes

Re: 2D Tree Visualisation

Matthew Faithfull4-Dec-07 3:42

Matthew Faithfull

4-Dec-07 3:42

I spent 18 months on and off on exactly this problme when I was 12-13 and writing a family history app. I was laying out descendant trees and struggled with getting them correctly organised for a long time. In the end I found a 3 pass algorithm worked best. Top down to get the structure and child groupings. Bottom up to establish the required width for the descendants of each node and then top down again to centre each set of child nodes under the parent/parents. I was very proud of my tree layout algorithm although I'm sure it's pretty standard stuff and in lots of books. My mother's second cousin tried to commercialize the app wihtout crediting me but as far as I know it didn't work out.
I was highly ammused when I got my first copy of MS Windows and found MS had outsourced development of the organisation chart application. Perhaps I could have made some money out of my trees after all Laugh | :laugh:

Nothing is exactly what it seems but everything with seems can be unpicked.

Re: 2D Tree Visualisation

CPallini4-Dec-07 4:53

CPallini

4-Dec-07 4:53

Matthew Faithfull wrote:
My mother's second cousin tried to commercialize the app wihtout crediting me

Nice guy.

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.

Re: 2D Tree Visualisation

zlike4-Dec-07 5:02

zlike

4-Dec-07 5:02

To draw the 2D Tree, first you need to find out the maximum width of the tree, which means you need to use BFS solution to iterate the tree.Once you have done that, you can draw whatever you want.

compile error about member variable initialization

George_George4-Dec-07 2:49

George_George

4-Dec-07 2:49

Hello everyone,

Why the below code segment will result in compile error? When I change code to the comment one (constructor), it can compile. The compiler is too stupid? Smile | :)

I am using Visual Studio 2005.

--------------------
main.cpp(13) : error C2758: 'Foo::vi' : must be initialized in constructor base/member initializer list

see declaration of 'Foo::vi'
--------------------

#include <vector>

using namespace std;

class Foo {

private:

	vector<int>& vi;

public:

	Foo (vector<int>& vi_in)
	{
		vi = vi_in;
	}
/*
	Foo (vector<int>& vi_in) : vi (vi_in)
	{
	}
*/
};

int main()
{
	vector<int> vi;
	Foo foo = Foo (vi);


	return 0;
}

thanks in advance,
George

Re: compile error about member variable initialization

CPallini4-Dec-07 3:22

CPallini

4-Dec-07 3:22

George_George wrote:
The compiler is too stupid?

Nope.

Reference types need initialization. See there http://www.devx.com/getHelpOn/10MinuteSolution/17298/1954?pf=true[^]
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.

Off Topic

toxcct4-Dec-07 5:37

toxcct

4-Dec-07 5:37

So, it happened to you too ?! Wink | ;)

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