Re: Hooking windows - C / C++ / MFC Discussion Boards

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Re: STL question - Moving Items around in a list

C^hris L^osinger8-Jul-02 9:53

C^hris L^osinger

8-Jul-02 9:53

it might work Smile | :)

here's my top-of-the-head STL version:

bool operator < (const CListItem &a, const CListItem &b)
{
  // a is less than b only if a is selected and b isnt
  return (a.IsSelected && !b.IsSelected);
}

...

std::stable_sort(myList);

-c

Being just contaminates the void.
--Robyn Hitchcock

Image Processing - easy, like Sunday morning.

Re: STL question - Moving Items around in a list

Tim Smith8-Jul-02 10:14

Tim Smith

8-Jul-02 10:14

Personally?

I would dump the list to a text file, exec the COMMAND.COM sort program and then read back in the text file. Smile | :)

Tim Smith

I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk?

Re: STL question - Moving Items around in a list

C^hris L^osinger8-Jul-02 10:16

C^hris L^osinger

8-Jul-02 10:16

now that's exotic!

or... fire up an instance of Access, shoot the data into a special table, read it back with SQL, then pick the data out of the recordsets!

-c

Being just contaminates the void.
--Robyn Hitchcock

Image Processing - easy, like Sunday morning.

Re: STL question - Moving Items around in a list

#realJSOP9-Jul-02 2:31

#realJSOP

9-Jul-02 2:31

I would try that but we're on CE... Smile | :)

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Re: STL question - Moving Items around in a list

jbarton9-Jul-02 5:23

jbarton

9-Jul-02 5:23

One solution would be to use stable_partition. This will reorder the list based on a predicate which returns true or false, without changing the relative order of any of the items in the same grouping.

The following example shows a simple implementation:

#include <iostream>
#include <list>
#include <algorithm>
#include <functional>

void PrintChar( char ch )
{
std::cout << "'" << ch << "'" << std::endl;
}

struct Partition : public std::unary_function< char, bool >
{
bool operator()( char ch )
{
return ( ch == 'B' || ch == 'E' || ch == 'F' );
}
};

int main(int argc, char* argv[])
{
std::list<char> myList;

myList.push_back( 'A' );
myList.push_back( 'B' );
myList.push_back( 'C' );
myList.push_back( 'D' );
myList.push_back( 'E' );
myList.push_back( 'F' );

std::cout << "before:" << std::endl;
std::for_each( myList.begin(), myList.end(), PrintChar );

std::stable_partition( myList.begin(), myList.end(), Partition() );

std::cout << "after:" << std::endl;
std::for_each( myList.begin(), myList.end(), PrintChar );

return 0;
}

Best regards,
John

Geting Explorer Drop Target - Help

zarco18-Jul-02 8:43

zarco1

8-Jul-02 8:43

I have been taked with creating a TCP/IP file server app that can impliment drag and drop functionality to explorer.

My problm is that the app lists only the file names and attributes, that it is passed without a refrence to the original location. I need to be able to get the target of a drag and drop opperation onto the explorer window, so I can pass that target back to the calling app.

I've spent countless hours trying to figure out how to get the drop target on the drag opperation to explorer without any success.

Any help would be greatly appreciated.

Life is like a warm bath, the longer you're in the more wrinkled you get.

Hooking windows

S van Leent8-Jul-02 7:59

S van Leent

8-Jul-02 7:59

Is there a way to hook a window (SetWindowsHookEx) without using a DLL. So I can hook CreateWindow, that it doesn't send WM_CREATE before I want it to?

Thanks in advance,
Sjoerd

LPCSTR Dutch = "Double Dutch Smile | :)

Re: Hooking windows

Oliver Daniel8-Jul-02 10:11

Oliver Daniel

8-Jul-02 10:11

You only need a DLL if the hook is to be a system wide hook. A hook that is limited to the scope of the current process can keep its code within the application.

Beyond that, I'm not sure that I understand what you are trying to do with WM_CREATE.

Re: Hooking windows

S van Leent9-Jul-02 1:43

S van Leent

9-Jul-02 1:43

Oliver Daniel wrote:
You only need a DLL if the hook is to be a system wide hook. A hook that is limited to the scope of the current process can keep its code within the application.

Thanks for this

Oliver Daniel wrote:
Beyond that, I'm not sure that I understand what you are trying to do with WM_CREATE.

CreateWindow does automatically send a WM_CREATE. But right under there, I call SetWindowLong, to change te Window proc. There, the WM_CREATE has to be handled. So, if I hook into the process, I can change the Window proc, before WM_CREATE has been sent.

Sjoerd van Leent

LPCSTR Dutch = "Double Dutch Smile | :)

Windows XP Socket BUG

8-Jul-02 7:22

I've created a standard server for small LAN apps using class CAsyncSocket(in Visual C++ 6.0). The maximum number of active clients is 1996. Now this is not a problem cause this ain't a Web server but after the clients disconnect themselves (even all) the server doesn't accept ever again clients. This server worked just fine in Windows 98 SE (but restrincting me to 46 clients). In Win 98 i've conneted and disconnected arround of 7000 clients (150 times * 46 maximum allowed active connections) to see if crashes and it didn't happend. So what the hell is wrong with Windows XP ? It was supposed to be Better but ...
If anyone can answer to my question please reply at my email address.

Codu'

Re: Windows XP Socket BUG

Tim Smith8-Jul-02 10:12

Tim Smith

8-Jul-02 10:12

Probably a bug in your software that doesn't show up on the 9x platform. Like I just told someone else, 9x and NT/W2K/XP execute programs very differently. Hidden bugs can crop up when you switch from one platform to another.

Tim Smith

I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk?

Screensaver problem

jancsi8-Jul-02 7:08

jancsi

8-Jul-02 7:08

Hi

Does anyone know how can I disable the activation of the screensaver from Visual C++? I tried the SendInput() function to simulate mouse movement but it doesn't work

Please help me
Thankx
Jancsi

xxx

Re: Screensaver problem

Gary Kirkham8-Jul-02 7:15

Gary Kirkham

8-Jul-02 7:15

Look at the SystemParameterInfo function and the SPI_SETSCREENSAVEACTIVE parameter

Re: Screensaver problem

Gary Kirkham8-Jul-02 7:16

Gary Kirkham

8-Jul-02 7:16

Had a type that should be SystemParametersInfo

unnamed registry keys

Mel Stober8-Jul-02 6:22

Mel Stober

8-Jul-02 6:22

How do you get the value of an unnamed key value? In regedit it is diaplayed as "(Default)". I've tried

RegQueryValueEx(hKey,
"(default)", 0, &type,
(unsigned char*)buf, &bufsize)

but it returns 2. I've also tried to RegEnumKey() and it gets the key name ok, but it just refuses to get the value.

Re: unnamed registry keys

DanielP8-Jul-02 6:36

DanielP

8-Jul-02 6:36

just set lpSubKey to NULL:

RegQueryValueEx(hKey,
NULL, 0, &type,
(unsigned char*)buf, &bufsize)

Printing progress bar?

dazinith8-Jul-02 6:20

dazinith

8-Jul-02 6:20

Could someone please explain what exactly shows the printing progress (status) bar, and how it is updated? I currently am using the following code, which does not have this progress bar..

void CDisplayPrintTemplate::BatchPrintPage()
{
	DOCINFO	di;
	CPrintInfo printInfo;
	CSCTaxDoc* pDoc = (CSCTaxDoc*)GetDocument();
	CDC	dc;
	CRect draw_area;

	ASSERT_VALID(pDoc);

	// use CPrintDialog to get the default printer and set the HDC to it
	CPrintDialog dlg(FALSE);
	
    if (dlg.DoModal() == IDCANCEL)     // Get printer settings from user
        return;

    dc.Attach(dlg.GetPrinterDC());     // Get and attach a printer DC

	dc.m_bPrinting = TRUE;

	// setup printinfo structure
	printInfo.m_bDirect = TRUE; // forces direct printing with no dialog
	printInfo.m_rectDraw.left = 0;
	printInfo.m_rectDraw.right = dc.GetDeviceCaps(HORZRES);
	printInfo.m_rectDraw.top = 0;
	printInfo.m_rectDraw.bottom = dc.GetDeviceCaps(VERTRES);
	dc.DPtoLP(&printInfo.m_rectDraw);
	
	draw_area = printInfo.m_rectDraw; // this variable is set so we can set the printinfo.m_rectdraw with 1 command after each page prints

	// setup docinfo structure
	di.cbSize = sizeof(DOCINFO);
	di.lpszDocName = pDoc->GetPathName();
	di.lpszOutput = NULL;

	dc.StartDoc(&di);
	OnPreparePrinting(&printInfo);	// start printing the document
	OnBeginPrinting(&dc, &printInfo);

	for (printInfo.m_nCurPage = 1 ; printInfo.m_nCurPage <= printInfo.GetMaxPage() ; printInfo.m_nCurPage++)
	{		
		OnPrepareDC(&dc, &printInfo);
		dc.StartPage();

		OnPrepareDC(&dc, &printInfo);

		OnPrint(&dc, &printInfo);
		dc.EndPage();		// reset page size as OnPrint may have modified them when header / footers were added to the page		
		printInfo.m_rectDraw = draw_area;
	}	
	OnEndPrinting(&dc, &printInfo);
	dc.EndDoc();
	VERIFY(dc.DeleteDC());
	dc.Detach();
}

thanks for the help!

-dz

Memory Tracking

NullStream8-Jul-02 6:08

NullStream

8-Jul-02 6:08

I have a very small application which should be using very little memory but according to the Task Manager the memory usage increases over time. Now of course this is a memory leak so I changed all the stack buffers to heap ones and made sure to free them at the end of each function so I know that the memory is being freed.

I also use a whole bunch of MessageBox's and a couple of GetDlgItem's.
Now figuring I'm an idiot I decided to take all of my buffer variables and instead of allocating them on the heap I decided to do so on the stack (aka not call malloc and use char[x] instead).

Again the memory usage still rises (by about 4KB mind you [if the task manager can be believed... most of my memory allocation is of the single MAX_PATH and _MAX_FNAME chunks).

Now thinking it could be from pass by value allocation I made sure and passed all my buffers by reference and yet it still rises.
(eg MessageBox(MainWindow,(char*)&buffer,"cannot open item",0);)

My last shot in the dark is maybe MessageBox is creating the leak by when clicking OK the message box is not freed by Windows or something. I know that's a stretch but I can't think of anything else.

Are there any tools out there that I can use to determine where memory is being allocated and find possible leaks? (mind you I'm using char*'s and straight Win32SDK (aka no mfc)). Can anyone suggest what I can look for next? Confused | :confused:

This is driving me absolutely batty. Mad | :mad:

Sean

Re: Memory Tracking

C^hris L^osinger8-Jul-02 6:12

C^hris L^osinger

8-Jul-02 6:12

grab a 14 day trial of Purify . it will spot most leaks in your app.

-c

Being just contaminates the void.
--Robyn Hitchcock

Image Processing - easy, like Sunday morning.

Re: Memory Tracking

NullStream8-Jul-02 6:59

NullStream

8-Jul-02 6:59

Well I did that and it stated I had no leaks in the application.
Maybe I'm just trusting the Task Manager when I shouldn't be.

Sean

Re: Memory Tracking

C^hris L^osinger8-Jul-02 11:48

C^hris L^osinger

8-Jul-02 11:48

if you're on NT/2K/XP, you can try calling _heapmin somewhere in your app. sometimes that will force the OS to minimize your app's heap (really free'ing memory you think you've already free'd, but which the OS hasn't given back to the general pool). sometimes it has no effect at all...

-c

Being just contaminates the void.
--Robyn Hitchcock

Image Processing - easy, like Sunday morning.

STL unicode/ANSI conversions

8-Jul-02 5:54

Anyone here knows of a site that has the details of how to convert
wstring to strings and vice versa in STL. Apparently, there are a
couple of different ways of doing this. I am not sure if VC6 supports
them, but anyhow, i would appreciate any hints.

thanks

Re: STL unicode/ANSI conversions

Michael Dunn9-Sep-04 7:22

Michael Dunn

9-Sep-04 7:22

Check out The Complete Guide to C++ Strings, Part II - String Wrapper Classes[^]

--Mike--
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Shareware stuff:: 1ClickPicGrabber | RightClick-Encrypt
CP stuff:: CP SearchBar v2.0.2 | C++ Forum FAQ
----
If my rhyme was a drug, I'd sell it by the gram.

Help needed, ADO Recordset - urgent

8-Jul-02 5:32

I'm writing a data server. In which, I have a Server, which has methods: FirstPage, PrevoiusPage, NextPage, LastPage, Insert, Delete. One page is 20 rows set in the server.

In the client, I have a client rowset class, which will cache all the rows it fetched so far. Say, invoke server's FirstPage to get 1st 20 rows, call Nextpage to get the NextPage, and so on. All the rows got will put in internal cache in client rowset, and navigation (first, prev, next, last) are so far so good. However, when i do insert in 10th row in client side, i created an instance, and invoke server side's Insert too. However, I'm not sure WHICH PLACE the ROW WILL be. Therefore, I can't synchronize the rowset. Can anyone tell me if there's any standard for insert positioning, and how to synchronize it ?

I've to finish it pretty soon, or i'll be fired. Please help me.

Renaming registry

sagmam8-Jul-02 5:10

sagmam

8-Jul-02 5:10

Is there any way to rename a regsitry key that already exists? The same way a user can do when he presses F2 while in the Registry Editor?

I could not find any Win32 API function that does this, nor an automation interface of regedit...

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