Selecting last line of text in my View class - C / C++ / MFC Discussion Boards

Re: Identifying multiple instances of a program?

Maximilien7-Jan-05 8:17

7-Jan-05 8:17

if you send an ID to an app, does it need to be "permanent" ? can you launch an unlimited number of the same application ? because if they also write settings to the registry, each app needs to have a permanent ID, and you don't want to change the app's ID.

for example, I launch app A 3 times, I will have A(1) A(2) and A(3); if I close A(2), A(1) and A(3) still need to exist with the same ID and if I understand correctly, A(1) A(2) and A(3) can be relaunch at an other time and need to release their settings; you don't want to have A(3) (for example) change ID to A(2).

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: Identifying multiple instances of a program?

PJ Arends7-Jan-05 8:21

PJ Arends

7-Jan-05 8:21

My first reaction would be to use shared memory via mapped files.
These links may help:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/base/file_mapping.asp[^]

http://www.codeproject.com/threads/#Inter%2DProcess+Communication[^]

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

CDC and BItmap question

Maverick7-Jan-05 7:25

Maverick

7-Jan-05 7:25

This code is supposed to draw the bitmap/image to an HDC specified:

image->Draw(hdc);

This was code was ok, and was drawing on CView::OnDraw()

Now I want the image to be drawn as an Icon/Thumbnail to a CListBoxCtrl.. This is my code (this code was taken from the CListImageCtrl article..)

I get the HBITMAP retunred from the function, then attach it on a CBitmap and then add the CBItmap, and then the icon is supposed to appear on the ListCtrl.. But it doesn't...

the original code is like this:

<br />
IPicture* pPic;<br />
OleLoadPicturePath(wpath, NULL, NULL, NULL, IID_IPicture,(LPVOID*)&pPic);<br />
<br />
...<br />
...<br />
...<br />
HBITMAP hPicRet = (HBITMAP)CopyImage(hPic, IMAGE_BITMAP, nWidth, nHeight , LR_COPYDELETEORG);	<br />
<br />
CDC hdcSrc, hdcDst;<br />
hdcSrc.CreateCompatibleDC(NULL);<br />
hdcDst.CreateCompatibleDC(NULL);<br />
<br />
// Load the bitmaps into memory DC<br />
CBitmap* hbmSrcT = (CBitmap*) hdcSrc.SelectObject(hPicRet);<br />
<br />
CBitmap* hbmDstT = (CBitmap*) hdcDst.SelectObject(hBmReturn);<br />
<br />
hdcDst.BitBlt(XDest,YDest,nDestWidth, nDestHeight, &hdcSrc,0,0,SRCCOPY);	<br />
<br />
pOldBitmapImage = (HBITMAP)SelectObject(hdcDst.m_hDC,bm);<br />
<br />
return pOldBitmapImage<br />

This code was ok but I modified this code because IPicture cant handle other image formats to i use an image library..

i replace this code:

CBitmap* hbmSrcT = (CBitmap*) hdcSrc.SelectObject(hPicRet);<br />

with:

hdcSrc.CreateCompatibleDC(NULL);<br />
image->Draw(hdcSrc.GetSafeHdc());<br />

T
The images doesn't appear.. I modified the code based on my understanding of CDC and Bitmaps..

Help please Smile | :)

"the possibilities are endles..."

Re: CDC and BItmap question

PJ Arends7-Jan-05 9:13

PJ Arends

7-Jan-05 9:13

Maverick wrote:
hdcSrc.CreateCompatibleDC(NULL);
image->Draw(hdcSrc.GetSafeHdc());

When you create a DC via CreateCompatibleDC it does not have a usable drawing surface (memory) associated with it. You have to use SelectObject to select a bitmap drawing surface into it. And be sure to restore the DC back to it's original state before deleting it.

hdcSrc.CreateCompatibleDC(NULL);
CBitmap TempBitmap;
TempBitmap.CreateCompatibleBitmap(hdcDst, image->Width(), image->Height());
CBitmap *pOldBitmap = (CBitmap *)hdcSrc.SelectObject(&TempBitmap);
image->Draw(hdcSrc.GetSafeHdc());
...
hdcSrc.SelectObject(pOldBitmap); // restore old bitmap

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

Re: CDC and BItmap question

Maverick7-Jan-05 15:36

Maverick

7-Jan-05 15:36

so, meaning before i draw to a CDC, it must have an attached HBITMAP first right?

tnx bro.! Smile | :)

"the possibilities are endless..."

Synchronization with CTypedPtrArray

Konrad Windszus7-Jan-05 7:24

Konrad Windszus

7-Jan-05 7:24

Do I have to synchronize access to a CTypedPtrArray which is used from two different threads? Or can I just add items in one thread and delete items in the other? How can that by synchronized the easiest way. Thanks in advance for your help
Regards
Konrad

Re: Synchronization with CTypedPtrArray

Ravi Bhavnani7-Jan-05 14:44

Ravi Bhavnani

7-Jan-05 14:44

You may want to use a CCriticalSection to achieve synchronization.

/ravi

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Selecting last line of text in my View class

7-Jan-05 6:59

I want to be able to, on a command, select the LAST line of text in my ViewEdit class and cut it or clear it. I have been working with
GetEditCtrl().SetSel(LineBeginning, LineEnd);
GetEditCtrl().Cut();

I am having a lot of difficulty in getting this to work correctly.
The problem I am having is selecting the last line, finding linebegining and line end.

Is there an easier way to clear or cut the last line of text?

Thanks
John

Curious about the file sort order

LiYS7-Jan-05 5:46

LiYS

7-Jan-05 5:46

Hi all:
Recently I've finished the coding of a tiny function which is to specify the files(Mp3s) order (by which the one appear first can be played first in the Mp3 player, this order depending on the result of DOS command "dir").

I'm not familiar with file system, after a little research, I found that the order in which you copying file to the destination folder(Mp3 Player Destination drive) is the order that the mp3 will played. So I implemented the code according to this principle. I was excited to found I really can control which mp3 should be played first. But after a little testing I found that this principle is not running stable, It will out of order once in a while.

Finally I decided to turn to another alternative which is FDT(File Directory Table). I heard from some guys that FDT can decide the file order either but much at low level.I wish I could write to the FDT of each file such that to achieve the objective. Can anybody provide the principle of writing to FDT or totally different method to affected the file order?
really appreciated ！！！ Big Grin | :-D

Convert PDF files into EMF

smile86917-Jan-05 5:11

smile8691

7-Jan-05 5:11

How do I convert a PDF file into an EMF format using Visual C++. Can anyone help.
Thanks in Advance,

fsdfsdfsdfsdfsdfsdf

Re: Convert PDF files into EMF

basementman7-Jan-05 7:09

basementman

7-Jan-05 7:09

You can set up a printer driver that will print to FILE and configure the print processor to use EMF format. Once this is configured, simply print the PDF to this "printer".

onwards and upwards...

Read single bit from a file

Nitron7-Jan-05 4:57

Nitron

7-Jan-05 4:57

How can one read a single bit from a file? Any ideas?

~Nitron.

ññòòïðïðB A start

Re: Read single bit from a file

Graham Bradshaw7-Jan-05 5:25

Graham Bradshaw

7-Jan-05 5:25

Can't you just read one byte, and then test the relevant bit of that byte?

Re: Read single bit from a file

Nitron7-Jan-05 5:27

Nitron

7-Jan-05 5:27

yea, that's what I'll have to do.

~Nitron.

ññòòïðïðB A start

Implementing a static function for utility class

Anonymous7-Jan-05 4:08

Anonymous

7-Jan-05 4:08

Hi!

I have written a custom messagebox class which is based on CDialog. When I want to call it I have to create a variable of the class type and then call the CDialog::DoModal() function like this:

CMyMsgBox myMsgBox(strTitle, strMsg, MB_YESNO | MB_ICONQUESTION;
myMsgBox.DoModal();

How must I write a static function that I can then call and do the same thing in one line call?

For example:

CMyMsgBox(strTitle, strMsg, MB_YESNO | MB_ICONQUESTION;

Thanks

Re: Implementing a static function for utility class

Maximilien7-Jan-05 4:20

Maximilien

7-Jan-05 4:20

no need to call a static variable, just create a global free function ( or part of a namespace )

for example :

::MyMessageBox( ... );

int MyMessageBox(...)
{
  CMyMsgBox myMsgBox(strTitle, strMsg, MB_YESNO | MB_ICONQUESTION;
  return myMsgBox.DoModal();
}

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: Implementing a static function for utility class

Anonymous7-Jan-05 6:40

Anonymous

7-Jan-05 6:40

Thanks that works now but what is a reason for such functions to be declared static? Is that more efficient? Can I declare it static?

virtual drive for winXP

neq7-Jan-05 3:33

neq

7-Jan-05 3:33

Hi,

i want to code something like this: on my hard drive is a file. and in my windows explorer i have a virtual drive which can be used like any other drive too, but it is using the file on my hard drive to read and save data on it. i want to do that because i can write some encryption code on the read and write functions to make my data protected.

I dont think that there is freeware out there doing exactly that. So i need a hint on how to get started with writing a driver for winXP which gives me a new virtual drive. I know that this must work because "Daemon-Tools" also make virtual CD-ROM-Drives.
Hope for any tutorials. thx

DebugActiveProcess question

Cptkli7-Jan-05 2:55

Cptkli

7-Jan-05 2:55

hello,

after i used DebugActiveProcess how can i have the handle of the thread who caused a debugging event? I am lost Cool | :cool:

Thank you!

Re: DebugActiveProcess question

Duncan Edwards Jones7-Jan-05 3:17

Duncan Edwards Jones

7-Jan-05 3:17

It is in DEBUG_EVENT_HEADER.dwThreadId, which is passed into WaitForDebugEvent()

'--8<------------------------
Ex Datis:
Duncan Jones
Merrion Computing Ltd

Re: DebugActiveProcess question

klington7-Jan-05 3:28

klington

7-Jan-05 3:28

dwThreadId is a DWORD value. Is it possible to convert DWORD to HANDLE?

Re: DebugActiveProcess question

Duncan Edwards Jones7-Jan-05 4:14

Duncan Edwards Jones

7-Jan-05 4:14

You can get a handle to the thread on the CREATE_THREAD_DEBUG_EVENT event - the DEBUG_CREATE_THREAD_DEBUG_INFO structure's .Handle member.

Then create a collection keyed by dwThreadId and look up the handle using that?

'--8<------------------------
Ex Datis:
Duncan Jones
Merrion Computing Ltd

Re: DebugActiveProcess question

klington7-Jan-05 4:48

klington

7-Jan-05 4:48

This works fine:

case CREATE_PROCESS_DEBUG_EVENT:
myHandle=DebugEv.u.CreateProcessInfo.hThread;

strangely not this

case CREATE_THREAD_DEBUG_EVENT:
myHandle=DebugEv.u.CreateThread.hThread;

Am i doing something wrong?

Scrollable view !?!

CaptnB7-Jan-05 2:45

CaptnB

7-Jan-05 2:45

Hi,

I'm currently using a view class CTabView derived from CCtrlView (see info: http://msdn.microsoft.com/msdnmag/issues/0600/Wicked/ ). I'd like to add scroll bars to be able to scroll all my view but I don't know how to do it.

If anyone got an idea...

CaptnB

How to get the registry location for an application specific registry details

Vaibhav Sanghavi7-Jan-05 1:13

Vaibhav Sanghavi

7-Jan-05 1:13

Hi All,

I want to capture all the registry data for any application. How can I find out the location in the registry where an application stores its information?

One way is finding out the node in registry under HEY_CURRENT_USER with node name equal to application name. But here its not guaranteed that all application would store the information in a node with the same name as application name.
For instance for an application with name "Adobe Reader 6.0" stores the information is under a node with name "Adobe Reader". Though both texts are very similar they do not match exactly. They may be very different also. So how do I go about it?

Any idea?

Also few applications store their information in some files. For Instance Quark Express. I want to capture all such files also.

Any suggestion?

Thanks,
Vaibhav Sanghavi.

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