C / C++ / MFC

17-Jul-06 6:00

hi all,
i want to develop one application in VC++.
A win32 dll can make use to call a MFC exe and to pass some argument value to that exe.At last the MFC exe can show the argument values passed by the dll.
A messagebox should be show the argument's value ...

thanks...
invoke(arguments)
Dll --------> MFC exe ---->MessageBox(arguments..)

Try again and again,
At last you will say
I don't know the meaning for impossible.,.

Cedric Moonen17-Jul-06 6:37

Cedric Moonen

17-Jul-06 6:37

Why don't you simply return the value from a function ? You call the function from the dll and store the result so it can be displayed in a message box.

It is difficult to help you because you don't provide a lot of information about your problem.

Cédric Moonen
Software developer

Charting control

maharaja pandian17-Jul-06 19:26

17-Jul-06 19:26

hi,
thanks for ur reply..
i want to call a MFC exe from another exe , so that i used shellExecute() to run another exe, at the same time ,i need to pass some parameter values to the another exe, which has to display the values in their corresponding edit box.

for e.g., if i passed "NAME","NUMBER","MARK1"
the another exe display those above information in their edit box.

Smile | :)

Try again and again,
At last you will say
I don't know the meaning for impossible.,.

David Crow17-Jul-06 6:47

17-Jul-06 6:47

You can get access to the arguments that the DLL passed via m_lpCmdLine.

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

"Judge not by the eye but by the heart." - Native American Proverb

maharaja pandian17-Jul-06 19:28

17-Jul-06 19:28

Try again and again,
At last you will say
I don't know the meaning for impossible.,.

David Crow18-Jul-06 2:36

18-Jul-06 2:36

So what exactly is your question? I've already told you about m_lpCmdLine.

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

"Judge not by the eye but by the heart." - Native American Proverb

William.Wang17-Jul-06 16:20

William.Wang

17-Jul-06 16:20

u may get some clue from COM(DLL) event. event interface is defined in a share file which is shared by both EXE AND DLL, DLL calls the functions defined by event interface, and exe realizes those functions.

life is like a box of chocolate,you never know what you r going to get.

maharaja pandian17-Jul-06 19:29

how to pass value to MFC exe from a dll

17-Jul-06 19:29

Try again and again,
At last you will say
I don't know the meaning for impossible.,.

maharaja pandian17-Jul-06 5:59

Re: how to pass value to MFC exe from a dll

17-Jul-06 5:59

hi all,
i want to develop one application in VC++.
A win32 dll can make use to call a MFC exe and to pass some argument value to that exe.At last the MFC exe can show the argument values passed by the dll.
A messagebox should be show the argument's value ...

thnaks...
invoke(arguments)
Dll --------> MFC exe ---->MessageBox(arguments..)

Try again and again,
At last you will say
I don't know the meaning for impossible.,.

led mike17-Jul-06 7:12

led mike

17-Jul-06 7:12

Not enough information. The EXE owns the UI thread so unless the DLL starts a worker thread it can't "pass" anything to the EXE. If you just want information "back from" the DLL code then define a structure that the DLL will fill the values of and pass a reference to it into the DLL in a function from the EXE code. When the function returns the structures values are filled in. If this is not your situation then you need to explain it more specifically.

AnimateWindow with controls on window

hell_admin17-Jul-06 5:11

hell_admin

17-Jul-06 5:11

Hello everyone, could someone help me with this problem
i animate window containing activex flash control, and the window rollouts
but while it's animating it is gray inside, and only when it's fuly visible the activex control appears.
I tryed to catch WM_SIZING but this message won't apear until i try to resize the window by hand.
Anyone knows how to solve that problem, maybe some message that is send by AnimateWindow or any other way.

C++ style casting

Rob Caldecott17-Jul-06 5:11

Rob Caldecott

17-Jul-06 5:11

Query. Most people from a C background would cast using the x = (type)y; syntax - for example, to convert a long to a short (knowing it won't be truncated of course...):

long aLong = 1234L;
short aShort = (short)aLong;

No problems.

However, I have come across some C++ code that uses the following syntax:

long aLong = 1234L;
short aShort = short(aLong);

Is this alternative syntax C++ only (I assume it is, but a Google seems to come back with conflcting results)? Also, is there any real advantage to either method? Are the various C++ casts (static_cast, dynamic_cast) more useful in casting POD types like this?

I can't believe I haven't come across the x = type(y); syntax before. I asked some other C/C++ old-timers here and they hadn't seen it either. Mad. Always something new to learn!

toxcct17-Jul-06 5:25

toxcct

17-Jul-06 5:25

Robert Edward Caldecott wrote:
I can't believe I haven't come across the x = type(y); syntax before

default constructors...

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

David Crow17-Jul-06 5:25

17-Jul-06 5:25

They are syntactically the same. It's much like:

int foo( void )
{ 
    return 12;
}

vs.

int foo( void )
{ 
    return (12);
}

Some folks use parenthesis with the sizeof operator:

int x = sizeof(obj);

while others do not:

int x = sizeof obj;

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

"Judge not by the eye but by the heart." - Native American Proverb

Nemanja Trifunovic17-Jul-06 5:35

Nemanja Trifunovic

17-Jul-06 5:35

In this case it is the same thing, but in general the syntax you describe is not casting, but initialization.

On the other hand, I like to use C++ casts (static_cast, reinterpret_cast) these days. It is very easy to search for them in the code, unlike the C style casts.

My programming blahblahblah blog. If you ever find anything useful here, please let me know to remove it.

Re: C++ style casting [modified]

Rob Caldecott17-Jul-06 6:09

Rob Caldecott

17-Jul-06 6:09

Nemanja Trifunovic wrote:
On the other hand, I like to use C++ casts (static_cast, reinterpret_cast) these days.

Me too, usually - however, when casting POD types like this, is there really any benefit from using static_cast?

ricecake17-Jul-06 11:15

ricecake

17-Jul-06 11:15

Hmm, for some reason it put my post as a reply to the wrong original post...

DavidCrow wrote:
Some folks use parenthesis with the sizeof operator:

int x = sizeof(obj);

while others do not:

int x = sizeof obj;

Actually, sizeof expr does not need parentheses, but sizeof(type) requires them (you can check the C++ grammar). I get a compile error when trying to compile this program:

#include <iostream>

int main()
{
	int i = 0;
	std::cout << sizeof(i) << '\n';
	std::cout << sizeof i << '\n';
	std::cout << sizeof(int) << '\n';
	std::cout << sizeof int << '\n'; // compile error for this line
}

--
Marcus Kwok

-- modified at 17:16 Monday 17th July, 2006

David Crow17-Jul-06 6:54

17-Jul-06 6:54

Robert Edward Caldecott wrote:
when casting POD types like this, is there really any benefit from using static_cast?

With integral types, and classes/structs without a constructor/destructor, there's no benefit.

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

"Judge not by the eye but by the heart." - Native American Proverb

David Crow18-Jul-06 2:48

18-Jul-06 2:48

I stand corrected. I always use parenthesis, regardless of the object, so I've never seen this compiler error. Thanks.

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

"Judge not by the eye but by the heart." - Native American Proverb

Stephen Hewitt17-Jul-06 14:15

Stephen Hewitt

17-Jul-06 14:15

Yes there is, visability and clarity.

Steve

David Crow18-Jul-06 2:46