C / C++ / MFC

2-Sep-06 7:57

You could always try using the Xmessagebox[^] which you are able to customize as much as you want.

Memory managment

Waldermort2-Sep-06 3:44

2-Sep-06 3:44

There are so many tutorials and posts about this that it's kinda hard to find exactly what I want. I have two processes, both sharing the same dll. Each process uses a class located in the dll. basicly the first process initializes the class, the second process reads it. The class itself contains many C type strings, some of them quite large, but when trying to read from the class I am getting NULL pointers. The class itself is not the problem, but sharing it and the data within is.

#pragma data_seg (".shared")
CMyClass	cMonitor;
BOOL		bSuccess = FALSE;
#pragma data_seg ()

#pragma comment(linker,"/SECTION:.shared,RWS")

My first attempt was to store a pointer to the class, but that failed misserably. I'm guessing the same problem is affecting the strings within the class, but I have no idea how to do it correctly.

PJ Arends2-Sep-06 5:31

2-Sep-06 5:31

http://msdn2.microsoft.com/en-us/library/h90dkhs0.aspx[^]

[quote]
Because of these restrictions, Microsoft does not recommend sharing C++ objects between processes.
[/quote]

You may be right
I may be crazy
-- Billy Joel --

Within you lies the power for good, use it!!!

Waldermort2-Sep-06 5:56

2-Sep-06 5:56

yeah I figured the only way to do what I want is to use a mapped file. I'm now scouring the internet looking for examples. I realise there are many on CP, but each of them only show the method of storing a single string. I'm looking to store multiple strings in the same file. I know it's possible by placing the strings one after another, but handling the location of each is where it gets tricky. So before I start writing the code for this, i want to make sure it hasn't already been done (and probably done better).

Cristian Amarie2-Sep-06 7:13

Cristian Amarie

2-Sep-06 7:13

I'd try in two ways:
1. The dll keeps internally its data as desired, and the client processes will supply buffers to the exported dll class; in return, the dll will fill buffers back to client (a la COM).
Dll:

<br />
class Dll {<br />
...<br />
public:<br />
  virtual bool GetMeData(IN "ID" whatYouNeed, IN OUT ULONG *pulSize, IN LPTSTR pStr) {<br />
    _tcsncpy(pStr, m_pszString, *pulSize);<br />
    *pulSize = lstrlen(pStr);<br />
    return true;<br />
  }<br />
...<br />
private:<br />
  LPTSTR m_pszString;<br />
}<br />

Process:

(ULONG ulSize = 255;<br />
LPTSTR pStr = new TCHAR[ulSize + 1];<br />
pDll->GetMeData("thatOne", &ulSize, pStr);<br />

2. GlobalAlloc/GlobalLock, or an IPC mechanism.

Waldermort2-Sep-06 7:36

how i can catch message come out dll in my program

2-Sep-06 7:36

I am taking the IPC approach on this one. It's about time I got my head around all this inter process chit chat. I'm currently putting together a small class which will store multiple strings/(who knows what else) into the mapped file. This may even turn into an article.

shortwave2-Sep-06 1:28

shortwave

2-Sep-06 1:28

how i can catch message come out from dll that i use in my program so i can post another message instade of dll one

Re: how i can catch message come out dll in my program

Stephen Hewitt2-Sep-06 2:05

Stephen Hewitt

2-Sep-06 2:05

Can you be a little clearer?

Steve

Re: how i can catch message come out dll in my program

_AnsHUMAN_ 2-Sep-06 3:06

_AnsHUMAN_

2-Sep-06 3:06

Do you want some notification for the completion of task that is being done in a dll?
You can use a flag variable, modify it in the dll(Pass it to the dll by reference) and then check for the value that if it gets modified, you do some other task.

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: how i can catch message come out dll in my program

shortwave2-Sep-06 3:39

shortwave

2-Sep-06 3:39

in my program i use function in dll when this function fails it post message(from insde the dll)like(Erorr number ...) so i dont want this message to appear i want to now win its posted and prevent it to appear to user and then i post my own message.

Re: how i can catch message come out dll in my program

Jun Du2-Sep-06 6:24

Jun Du

2-Sep-06 6:24

If it's some unexpected error or your DLL cannot handle it, you may throw a string (instead of displaying it). Your caller should catch the string thrown from the DLL and process it any way you like.

Best,
Jun

ToolTip on Icons

muravi2-Sep-06 1:22

muravi

2-Sep-06 1:22

hi,
i am doing program on tooltips,i know how to create tooltip on button but i have to create tooltip on icons(images also),i tried but i didnt get
please anyone help me,
thanks.

kanth

Re: ToolTip on Icons

PJ Arends2-Sep-06 5:39

Setting & getting encryption level

2-Sep-06 5:39

Using CToolTipCtrl::AddTool() you can specify different tooltips for different areas of a window. So for the window that is displaying the icons simply call AddTool() with each icon's rectangle area.

If you are not using MFC then take a look at the TTM_ADDTOOL message.

You may be right
I may be crazy
-- Billy Joel --

Within you lies the power for good, use it!!!

RoyceF2-Sep-06 1:19

RoyceF

2-Sep-06 1:19

Hi,

I need to write a relatively simple function for getting and setting values in the system security settings. For instance, I know how to use the SetEncryptionLevel() of the Win32_TSGeneralSetting class. But I need a method for getting the current value of the encryption level, e.g., GetEncryptionLevel(), but I can find no such method. Does anyone know how to get this value? I also need to be able to get and set the TLS 1.0 setting.

Thanks,
Royce

Get Pixel Directly From Vga Memory

javad_20052-Sep-06 1:01

javad_2005

2-Sep-06 1:01

I Want To Get Pixel Directly From Vga Memory
And Then Modify Them and write Them Directly In To Vga Memory Again.

Re: Get Pixel Directly From Vga Memory

PJ Arends2-Sep-06 5:41

Re: Get Pixel Directly From Vga Memory

2-Sep-06 5:41

AFAIK this can not be done. You can however get a device context for the entire screen and call GetPixel() and SetPixel() on that device context.

You may be right
I may be crazy
-- Billy Joel --

Within you lies the power for good, use it!!!

javad_20052-Sep-06 23:13

javad_2005

2-Sep-06 23:13

SetPixel Or GetPixel Are Speed Low

Re: Get Pixel Directly From Vga Memory

PJ Arends3-Sep-06 16:04