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With regards to:
---> bReadible = !(nStatus == 0);
What does this mean? I have never seen code written like this before.
BOOL CRawPingDlg::IsSocketReadible(SOCKET socket, DWORD dwTimeout, BOOL& bReadible)
{
timeval timeout;
timeout.tv_sec = dwTimeout / 1000;
timeout.tv_usec = (dwTimeout % 1000) * 1000;
fd_set fds;
FD_ZERO(&fds);
FD_SET(socket, &fds);
int nStatus = select(0, &fds, NULL, NULL, &timeout);
if (nStatus == SOCKET_ERROR)
return FALSE;
else
{
bReadible = !(nStatus == 0);
return TRUE;
}
}
Thank you
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The ! means NOT.
If you have a boolean value like true the operator ! will make it to false.
if nStatus has the value zero, the term wil be true. !(nStatus == 0) will make it false. It is the same if you write nStatus != 0.
sledge
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esepich wrote:
bReadible = !(nStatus == 0);
What does this mean? I have never seen code written like this before.
The ! negates the statement. if (nStatus == 0) is TRUE, then the ! negates it and bReadible will be FALSE.
Douglas A. Wright
dawrigh3@kent.edu
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Hiya I am trying to use a C# dll from my MFC program. But am having a big problem.
To use the C# dll, I have changed the compiler settings in my MFC program to - Use Managed Extensions and have included #using <mscorlib.dll>.
But as soon as I change to use managed extensions, my program will not run.
I am using .Net Framework Ver 1.1
Am I doing something wrong or is there another way??
Thanks.
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As most of you know, I have been trying to do WYSIWYG printing from a CRichEditCtrl. The problems I was having was that the font bring printed was either too big or too small for the perscribed area.
OK, here is some what of a solution (except it isn't bullet proof!)
I create a device context to the display (while printing and in print preview), create the font scaled to the display and scaled to the printer. I then get the size of the line for each. I then calculate the scaling factor by getting the pixels in the X axis for both and dividing. For the printer here at work, it is 1200DPI, and the screen is 96DPI. This factor works out to be 12.5.
I then take the text width on the screen and multiply it by this ratio to
get an ideal output width. Divide the printer width by the ideal width that gives a ratio. I then get the average character width (from
GetTextMetrics - Printer). I then multiply this value with the ration from the ideal vs. actual printer. Then set this value in the LOGFONT.lfWidth and create a new font and select it into the printer device context.
As an example:
The width of text on the display is 410 pixels, this same string on the
printer (with no change in the character width) is 5352. The scaling factor of 12.5 means that the ideal lenght is 5112.5 pixels. The division of the Printer/Ideal = 1.066146. The average character width for the printer (with selected font) is 80 pixels. So, divide the 80 / 1.066... and the new character width is 75.
I read in Petzold's book that the lfWidth of the LOGFONT can be set to the tmAvgCharWidth from the TEXTMETRIC structure. AND, that it can be scaled.
The resulting output for the TIMES NEW ROMAN 12/10pt and COURIER NEW 12/10pt are right on (with the exception of a rounding error of a pixel). I do this for each line.
Now the caveat! When I use Arial Normal, the last line which isn't as long as the rest, and this creates an average character width is bigger than the previous lines.
I think there is something in the TrueType specification that can help with this. Does anyone know? If so, what?
Larry J. Siddens
Cornerstone Communications
TAME THE DOCUMENT MONSTER
www.unifier.biz
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Hi All,
I want to create an imagelist from the files selected by the user. How can I do that? Is any sample code available?
With regards
A.Santosh
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Hi there 
I have a problem Maybe anyone is able to help me to solve this problem Here we go....
There is a window with a frequently changing background . Now i want to add a child window to this window. I also want that the child is "transparent". This isnt a great problem! Using GetDC, CreateCompatibleDC and BitBlt ... manually it works! But ... when the image of the parent window changes ... how can the "child" window notified so the WM_PAINT handler is fired??
Any ideas? 
Thanks for reading
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Hi,
WM_PAINT is called over 4 reasons:
1) application starts
2) application is being minimized
3) application is being maximized
4) a control is hiding an other control (moving over it)
if you want to "fire" WM_PAINT you can call either Invalidate or Redraw.......
hope this helps ya
Yaron
Ask not what your application can do for you,
Ask what you can do for your application
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an other approach :
in the dialog resources, check the 'clip children' and 'clip siblings' check boxes.....
Yaron
Ask not what your application can do for you,
Ask what you can do for your application
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I missed to mention that the other window which the child should be added is another application. I dont have control over it
I dont want to subclass the parent window because if my application crashes the other application must be restarted 
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I have a freeware program that was writtn in C++ MFC that I would like to study it's structure. Unfortunatly, I don't have access to the source code for debugging. Is there a way to get the source code from the bin disassembly?
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Hi,
I'm writing a program that incorporates a Rich Edit control text editor containing consisting of an arbitrary number of "documents". On the left of the screen is a tree view, and on the right of the screen is a rich edit control for text editing. The user uses the tree view to create new "documents". By clicking on a tree view item, the document that that represents should appear in the rich text control on the right. All of this has to be saved to a single file (possibly using structs), and exported to an RTF. Saving to RTF is sorted (thanks to help from users here), but my problem is this:
How can I save an entire "document" to a string? I have tried saving to a char*, but I haven't got it working.
Note that I am using _no_ MFC, and I am not a very experienced programmer - I am still on a steep learning curve, so please forgive any idiocy in my code.
This is what I tried:
<br />
char* szTextTest;<br />
long nTest;<br />
<br />
static DWORD CALLBACK <br />
MyStreamInStringCallback(DWORD dwCookie, LPBYTE pbBuff, LONG cb, LONG *pcb)<br />
{<br />
memcpy(pbBuff,szTextTest,nTest);<br />
<br />
*pcb = cb;<br />
<br />
return 0;<br />
}<br />
<br />
void LoadRTFFromString(HWND hWnd, int nIDDlgItem)<br />
{<br />
EDITSTREAM es;<br />
<br />
es.pfnCallback = MyStreamInStringCallback; <br />
<br />
SendDlgItemMessage(hWnd,nIDDlgItem,EM_STREAMIN,SF_RTF,(LPARAM)&es);<br />
}<br />
<br />
<br />
static DWORD CALLBACK <br />
MyStreamOutStringCallback(DWORD dwCookie, LPBYTE pbBuff, LONG cb, LONG *pcb)<br />
{<br />
nTest = cb;<br />
szTextTest = new char[cb];<br />
memcpy(szTextTest,pbBuff,cb);<br />
<br />
*pcb = cb;<br />
<br />
return 0;<br />
}<br />
<br />
void SaveRTFToString(HWND hWnd, int nIDDlgItem)<br />
{<br />
EDITSTREAM es;<br />
<br />
es.pfnCallback = MyStreamOutStringCallback; <br />
<br />
SendDlgItemMessage(hWnd,nIDDlgItem,EM_STREAMOUT,SF_RTF,(LPARAM)&es);<br />
}<br />
Even if I could get the above working, would I be able to save the character pointer, szTextText, to file using WriteFile() and have it save all the text it has been allocated? I have only ever saved structures containing chars that aren't pointers to file so far...
If I can copy the whole of a formatted RTF file to a string, this is what I am thinking of doing to save the structure:
For each folder, copy text into the string such as "{{folder:name_of_folder;}}" or some such, and then add to the end of that the rich text that is associated with that folder. When reloading from file, I just need to search the string for occurrences such as "{{folder::...}}" etc in order to rebuild my treeview and associate text appropriately.
Thus the string created to hold the rich text needs to be infinitely long - or rather, it needs to be capable of holding formatted text that could run into the 100,000s of *words*.
To clarify, in case that was a bit long winded: I need to find a non-MFC way of saving and loading all of the text from a rich edit box into a string. And I need to be able to append to that string the text from _other_ rich edit boxes.
If anybody could give me any hints on how I could go about this, I'd be really grateful, as always.
Many thanks,
KB
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I've been downloading some projects from the site, the latest one being the grid control, and keep getting this error during linking of the project (in vc 6.0):
Linking...
LINK : fatal error LNK1104: cannot open file "mfc42u.lib"
Error executing link.exe.
I only have mfc42.lib. What do I have to do to fix this?
Ed
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The u stands for unicode.
You have to change the configuration of your project to win32release or win32debug.
Another way to fix this will be installing the unicode versions of mfc.
Hope this helps
sledge
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'Sledge' is correct, you can change the project settings to not use Unicode builds ... but if you HAVE to use Unicode, and have the Visual Studio Install/MSVC 6 install CDROM, run setup, select Customised install, you should then be able to select Unicode components
(been a while since I had to do it, so those instructions are a bit rusty, but that's the general technique)
'G'
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Hi..I am also new in vc++, I faced this problem and I solve it...
Follow the step:
1:Search(find) MFC42U.LIB file from the Installation CD
2:Copy the file
3:Paste into the VC\Lib files
no issue..at all...
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I'm trying to convert a C program into a VC++ program and have everything compiling but I get a ton of Link errors.
The error I get is:
error LNK2005: ... already defined in ...
I'm getting 230+ of these error and don't really know why. I've used #pragam once in all the headers, but still get this error.
Any help on this error or converting C to C++?
Thanks,
Jim
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Does the symbol correspond to a global variable? Something like this?
int global; If so, try writing this in the .h file:
extern int global; and then this in just one .cpp:
int global=0; If this works and you're curious, I can try to explain the reason of your problem.
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
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It's defined in a header with the extern key word.
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Here is what is defined in the header file:
#ifdef ELABORATE_ALL_VARIABLES
D2N_GLBL_STRUCT *D2N_GLBL;
void D2N_GLBL_Elab( void );
void D2N_GLBL_Elab( void )
{
D2N_GLBL = (D2N_GLBL_STRUCT *) calloc( sizeof(D2N_GLBL_STRUCT), 1);
}
#else
extern D2N_GLBL_STRUCT *D2N_GLBL;
#endif
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remove extern D2N_GLBL_STRUCT *D2N_GLBL; ??????? What is that remove thing? Could you explain what this file (is it a header?) is supposed to do, and what role does the macro ELABORATE_ALL_VARIABLES play?
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
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I wish I knew, but I've never seen the program run before! I'm just having to port it to C++.
The remove was something I forgot to remove when debugging.
I think that this Macro does two different things based on what function is using it.
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Ok. We can try to make an educated guess 
My opinion is that the header is used both for declaring things and for defining them. The second use is activated by ELABORATE_ALL_VARIABLES. Let's say the header is called a.h: then I guess you have to #include it like always everywhere except in the one file a.cpp, where you should have to write:
#define ELABORATE_ALL_VARIABLES
#include "a.h"
... or, alternatively, define this macro for a.cpp in the properties section of the file (Fileview pane->right click on a.cpp->Settings->Preprocessor definitions).
Good luck. Let me know if I can give you more assistance.
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
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