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According to MS, a custom DLL that is statically linked to the MFC library needs to have a CWinApp-derived class and a single object of that application class, as does an executable MFC application. The CWinApp object of the DLL, however, does not have a main message pump, as does the CWinApp object of an application. If the DLL opens modeless dialogs or has a main frame window of its own, the application's main message pump must call a routine exported by the DLL, which in turn calls the CWinApp::PreTranslateMessage member function of the DLL's application object.
See coding example and more info on the topic here:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcsample98/html/_sample_mfc_dlltrace.asp[^]
SkyWalker
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Thank you.
Does it mean that we can't write a stand alone button control (library) using dll (that is without processing the message specially for the button in the application)?
- NS -
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You can write whatever dll you want 
I would recommend you using the following:
<br />
Overwrite the PreTranslateMessage()for your window derived class (whatever that may be):<br />
BOOL CDllWnd::PreTranslateMessage(MSG* pMsg)<br />
{<br />
if (IsDialogMessage(pMsg))<br />
return TRUE;<br />
<br />
return CWnd::PreTranslateMessage(pMsg);<br />
}<br />
-----------<br />
Export then a function<br />
extern "C" DllExport BOOL FAR PASCAL FilterDllMsg(LPMSG lpMsg)<br />
{<br />
AFX_MANAGE_STATE(AfxGetStaticModuleState())<br />
TRY<br />
{<br />
return AfxGetApp()->PreTranslateMessage(lpMsg);<br />
}<br />
END_TRY<br />
<br />
return FALSE;<br />
}<br />
-----------<br />
In user application: <br />
BOOL CYours::PreTranslateMessage(MSG* pMsg)<br />
{<br />
if (CTheBaseClass::PreTranslateMessage(pMsg))<br />
return TRUE;<br />
<br />
return FilterDllMsg(pMsg);<br />
}<br />
SkyWalker
-- modified at 6:53 Monday 3rd October, 2005
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In my application i want to have a sys tray icon which has a Menu like
A
B
C --> C.1
C.2
C.3
D --> D.1
D.2
D.3
E --> E.1
E.2
A and B do not have pop-ups and are present to invoke some defined shortcuts
In my resource editor I have created a MEnu resource having the following
A
B
C
D
E
F
Elements for C , D and E and added and removed at run-time .
I want to be able to create functionality to be add the same . I was unable to find any routines where I would be able to add a CMenu (for say menu containing C.1 ,C.2 etc) to an existing CMenu(GetSubMenu(0)) .
Please help
THanks
-- modified at 21:58 Sunday 2nd October, 2005
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is there a way to simulate a hardware interrupt in C++? i want to generate an interrupt for lets say mouse movement or keyboard press. is this possible?
thanks!
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I'd like to create a program that will send a file (.txt) to its server. I came across articles regarding TCP/IP, Socket, WinSock, etc.. Which of these do I have to focused into in creating a simple server/client connections? of course these methods have their own advatages/disadvantages or limitations. There's a NDK program/article here in codeproject but I don't know if I'll just use it or better create network programming on my own.
One more thing, is it possible for a program to detect if the computer it currently resides into is the server or the client? So that my program will automatically shift into server mode/client mode depending where it is being launched. Thanx
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For simple network comunication any article on Socket or Winsock should be enough.
If you want to indentify the current computer you can use gethostname() and then gethostbyname() if you want the IP address.
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Look try to study and use the
socket , it the basic element
for networking.CSocket is a
usefull class provided by VC.
If u have defined the port range
say from 7000 to 8000 . Then u
can try connecting to it as a
Client .If there is successfull
connection then u can know that
the opposite machine is a Server
else it is Client .The program
just have to use a FOR loop.
Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com
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benjnp wrote:
I'd like to create a program that will send a file (.txt) to its server. I came across articles regarding TCP/IP, Socket, WinSock, etc.. Which of these do I have to focused into in creating a simple server/client connections? of course these methods have their own advatages/disadvantages or limitations. There's a NDK program/article here in codeproject but I don't know if I'll just use
Having used the NDK library I can tell you it’s got a nice interface and works well. To send text files (or any files for that matter) you will need to add that functionality. There is however another simple project here that demonstrates sending files.
Network Transfer Of Files Using MFC's CSocket Class
[^]
benjnp wrote:
or better create network programming on my own.
As far as writing your own, go ahead there is no better way to learn network programming than doing it your self.
benjnp wrote:
One more thing, is it possible for a program to detect if the computer it currently resides into is the server or the client? So that my program will automatically shift into server mode/client mode depending where it is being launched. Thanx
That should be easy enough, when the main dialog or view starts, read the servers location (computer name) from where ever (registry or ini file) compare it to the local host (see gethostbyname()) if they are the same then start the app in server mode.
Good Luck...
DEBUGGING : Removing the needles from the haystack.
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thanx for your help guys, i'll start looking for topics regarding socket programming right away
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How can I make my computer a SERVER and have other computers connected to the INTERNET as client? My computer is a part of a LAN which connects to the internet through a gateway.
Ranjan
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Hi Dear
Socket progamming is so nice, you can use CSocket & CAsyncSocket.
you can find meny sample in
Here]
Iman Ghasrfakhri
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Is your computer behind a firewall? If so can you open some ports? Does it have a static address? Is this a private address (192.168.X.X, 172.16.X.X, 10.X.X.X)?
John
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Hi all,
I've got the following problem:
I try to write an application which should use a specific function that
is available in a DLL.
Since I only need one of the various DLL functions and it is neccessary
to create an EXE file as small as possible I thought about not binding
the according LIB file into the project and loading the DLL at runtime.
My problem is, that I can identify the function name within the DLL
(by using DependencyWalker), but I don't know the function parameters
(type and order) I have to use. I also don't know the type of the
return value... 
Is there any possibility (some kind of utility prog or so...) to get some
information about the parameters to use???
Many thanks in advance!
Reinhard
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it was my problem some month ago , I can't find any answer 
Iman Ghasrfakhri
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reinhard_jd wrote:
My problem is, that I can identify the function name within the DLL
(by using DependencyWalker), but I don't know the function parameters
(type and order) I have to use. I also don't know the type of the
return value...
What exactly are you trying to do? Why do you want/need to call a function but you don't know about its parameters and return type? Even if you get the type and order of parameters, what values will you use? Even if you get the type of the return, what will you do with the returned value?
reinhard_jd wrote:
Since I only need one of the various DLL functions and it is neccessary
to create an EXE file as small as possible I thought about not binding
the according LIB file into the project and loading the DLL at runtime.
So you have a lib for that DLL? Even if you used it instead of loading the DLL yourself, you'd still need some header file with the function prototype, or at least the information to declare the prototype yourself... You have the lib but not the header files?
What's the DLL and what's the function? I really don't undertand your scenario... Or is this some kind of homework assignment?
--
jlr
http://jlamas.blogspot.com/[^]
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Hi jlr,
I thought that the short version of the story (i.e. the description of the actual problem)
would do it, but here we go with the whole story...
Years ago we developed a software which read some digital and analog values by using a special
I/O card, analyzed the data and depending on the results of this reacted with screen and I/O outputs.
We sold some dozen of the units (hardware and software) and still do service and further development
for the solution.
The card as well as the library (and the DLL) to read/write the ports were manufactured by a small
German firm that doesn't exist anymore. Now we have do do some changes within the software and
unfortunately it seems as if the (packed) EXE file becomes to large to fit onto a floppy disk.
Since the machines we sold at that time didn't have a CD-ROM drive I thougth about how to create
a smaller file...
I don't have the source files of the driver/library and I also have no DEF file of the DLL.
The only thing I have are some LIB files (for the different memory models), the DLL and a
written documentation.
I tried to call the DLL functions directly with the very same parameters as I have to use when
using the LIB, but that didn't work.
Therefore I search for a possibility to find out the type and order of the parameters I have
to use when calling the DLL functions at runtime...
Hope s/o can help me.
Thanks and Greetings from Germany
Reinhard
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Ah, Ok. I was curious and couldn't understand your situation.
reinhard_jd wrote:
I tried to call the DLL functions directly with the very same parameters as I have to use when
using the LIB, but that didn't work.
Unless the lib had something more than a simple stub for the function in the DLL, that should have worked. How did you declare the function type? Perhaps you had a problem with the calling convention (i.e., cdecl Vs. pascal)? That affects the order in which the parameters are put in the stack before calling the function, and if I remember well, also which end of the call is responsible for removing the parameters from the stack. Maybe specifiying the correct calling convention is all that you need.
For C++ functions, Dependency Walker can show you all the parameters and return type of each function if you press F10 or right-click and select "Undecorate C++ functions". However, that's not an option for C functions, which I suspect is what you have.
reinhard_jd wrote:
Thanks and Greetings from Germany
Appreciated and returned from Uruguay,
--
jlr
http://jlamas.blogspot.com/[^]
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Hi jlr,
I've already tried both calling conventions. I suppose they did something more than only
calling the DLL function from within the LIB file 
Undecorating the C++ functions also didn't help...
I hoped that there could be some way I didn't hear of until now to find out the parameters,
but it seems as if there is nothing to do the trick.
At the moment a colleague of mine is trying to find out who (in person) was the original
creator of the library. Perhaps we can find it out by this way. 
Once again thanks!
Reinhard
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how can i send values in url
only not in GET method like it set by defult
in need to send it in POST method
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static const char str[3] = {'a','b','c'};
static const char str[3] = "abc";
what is the difference between the above two? or are they same? is the first one null terminated? why do some folks use the first one when the second one is easier.
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