C / C++ / MFC

Alvaro Mendez25-Feb-03 7:32

25-Feb-03 7:32

OK, just tried it and it's working fine, even with the global variable!

I put your code into a little EXE (Doodle.exe), compiled it, and then copied it to a second EXE with a different name (Doodle2.exe). Here's the code:

char* compiler_time = __TIME__;
 
extern "C" __declspec (dllexport) char* get_compile_time()
{
	return compiler_time;
}
 
void CDoodleDlg::OnButtonCallExe() 
{
	typedef LPSTR (CALLBACK* LPFNDLLFUNC1)();
	HINSTANCE hToDLL = LoadLibrary("Doodle2.exe");
 
	// If the app doesn't exist, then forgettaboutit
	if (hToDLL == NULL) 
	{
		AfxMessageBox("Failed to load the app.");
		return;
	}
 
	LPFNDLLFUNC1 lpfnDllFunc1 = (LPFNDLLFUNC1)GetProcAddress(hToDLL, "get_compile_time");
	if (lpfnDllFunc1 != NULL)
	{
		// call the function
		char* strResult = lpfnDllFunc1();
		if (strResult == NULL) 
			AfxMessageBox("WTF!");
	}	
}

Are you sure it's your strResult that comes back NULL and not your lpfnDllFunc1? By the way, I couldn't define the EXPORT macro since MFC already defines it.

Regards,
Alvaro

The world is a dangerous place, not because of those who do evil, but because of those who look on and do nothing. -- Albert Einstein

will138325-Feb-03 7:49

will1383

25-Feb-03 7:49

LOL I was afraid that would happen. lol. something fishy is going on fer sure.

Alvaro Mendez wrote:
Are you sure it's your strResult that comes back NULL and not your lpfnDllFunc1?

Yes because I've been able to step into the exe code, sit and follow it's execution, and then watch the function return NULL. Everytime. WTF | :WTF:

Well, I think you've gone as far as you can. That does help verify that it must be something funky in my build options or in the application itself that is preventing me for getting at what I need.

I really appreciate your help. Helps me understand a little bit more every day. Thank you very much for that. Guess I have to try from square 1 again Roll eyes | :rolleyes:

LOL Software never ceases to amaze me. At least I'm not having this problem with my telemetry software.

Once again thank you Smile | :)

Dan Willis

Alvaro Mendez25-Feb-03 10:04

25-Feb-03 10:04

I'm glad to have helped. Smile | :)

Too bad it didn't uncover the problem. OMG | :OMG:

Regards,
Alvaro

The world is a dangerous place, not because of those who do evil, but because of those who look on and do nothing. -- Albert Einstein

Neville Franks25-Feb-03 9:33

Neville Franks

25-Feb-03 9:33

"Calling an Exported Function in an EXE from Within a DLL"
http://codeguru.earthweb.com/dll/ExportingFromExe.html[^] may or may not help.

Neville Franks, Author of ED for Windows. www.getsoft.com
Make money with our new Affilate program

Active View

jeremysay25-Feb-03 4:56

jeremysay

25-Feb-03 4:56

hello all ,
In MDI project, i have always an ChildFrame which is active.
when i press a key i want to activate the view asociate to the childFrame which is active.
You know how to do this?
Thx in advance

Alvaro Mendez25-Feb-03 5:16

25-Feb-03 5:16

GetActiveView() Smile | :)

Regards,
Alvaro

The world is a dangerous place, not because of those who do evil, but because of those who look on and do nothing. -- Albert Einstein

jeremysay25-Feb-03 6:54

jeremysay

25-Feb-03 6:54

Alvaro Mendez wrote:
GetActiveView()

Is not to return the active view ? Confused | :confused:

in my case i havn't active view, only active frame, and so i want to active the view associated with this frame

Alvaro Mendez25-Feb-03 7:06

25-Feb-03 7:06

Oh, I see. Then perhaps SetActiveView is what you need.

Regards,
Alvaro

The world is a dangerous place, not because of those who do evil, but because of those who look on and do nothing. -- Albert Einstein

jeremysay25-Feb-03 7:29

jeremysay

25-Feb-03 7:29

ok that is what i think but how to use it :

void SetActiveView(
CView* pViewNew,
BOOL bNotify = TRUE
);

I must to get a pointer my view but how to find this?

Dynamic defines?

rromerot25-Feb-03 4:55

rromerot

25-Feb-03 4:55

Is there a way to create c++ variables out of literals read in from a file? I want to read in a file that has a line that reads CONNECT. I want to make a variable named CONNECT and have the value of 2000 so I can use it in a switch/case statement. I want to be able to create these variables dynamically so that I can eliminate hard-coded values.

Any help will be appreciated,

Ray Unsure | :~

Re: Dynamic defines?

C^hris L^osinger25-Feb-03 5:02

C^hris L^osinger

25-Feb-03 5:02

rromero wrote:
Is there a way to create c++ variables out of literals read in from a file?

not at run time.

at compile time you can use the "##" construct to glue two strings together in a macro.

-c

When history comes, it always takes you by surprise.

Bobber!

Re: Dynamic defines?

Alvaro Mendez25-Feb-03 5:14

Which is the best SMTP class, according to you?

25-Feb-03 5:14

There's no way to do it at run-time, but you can go with something like a hash map, where you associate a name ("CONNECT") with a value (2000). Check out the std::map class, which you can define like this:

#include <map>
using namespace std;
 
typedef map<CString, int> FileVariables;  // assuming all values are integers
 
FileVariables vars;
fv["CONNECT"] = 2000;
fv["DISCONNECT"] = 4000;
 
// Then you can use it like this:
if (fv["CONNECT"] > 10000)
   ....

Regards,
Alvaro

The world is a dangerous place, not because of those who do evil, but because of those who look on and do nothing. -- Albert Einstein

yasbas25-Feb-03 4:14

yasbas

25-Feb-03 4:14

And where it can be downloaded or a demo can be seen ?

Thanks in regards!

Re: Which is the best SMTP class, according to you?

Big Art25-Feb-03 5:42

Big Art

25-Feb-03 5:42

CSMTPConnection class and CMimeHeader, CMimeMessage, CMimeText in MFC 7.
Look at MSDN examples.

Art

How to reload the values in the resourse file at runtime?

julych25-Feb-03 4:11

julych

25-Feb-03 4:11

Let's say I have changed the captions of some buttons in my MFC dialog application at runtime. Is it possible at some time later to reload the original names from the resource file without restarting the application and how?

Re: How to reload the values in the resourse file at runtime?

User 665825-Feb-03 4:26

User 6658

25-Feb-03 4:26

I suggest you using a sting table and then restore the names with LoadString().

modified 12-Sep-18 21:01pm.

DTMF Decoding? (or FFT code)

Simon Steele25-Feb-03 4:04

Simon Steele

25-Feb-03 4:04

Has anyone seen any good example code for doing DTMF decoding? I know that TAPI can do this with a modem, but I need to do it with a standard wave stream - it's a non-telephony application.

If you don't, then perhaps you could point me in the direction of some good FFT code or a library of some sorts.

Thanks in advance,

--
Simon Steele
Programmers Notepad - http://www.pnotepad.org/

icon on dialog box

nitingonsalves25-Feb-03 3:55

25-Feb-03 3:55

Hi I was wondering how to convert a .gif to a .ico to use in a dialog box.

Thanks

Regards
Nitin

Jon Hulatt25-Feb-03 4:01

Jon Hulatt

25-Feb-03 4:01

easiest way is to open the gif in something like paintshop pro, then copy it (edit|copy type copy i mean), and paste into the VisStudio dialog editor. thats what I do, anyway.

#include <beer.h>

nitingonsalves25-Feb-03 4:25

25-Feb-03 4:25

Hi I tried it but was not successful. It is not displaying the entire image but just a part of it.
Thanks
Nitin

benjymous25-Feb-03 4:31

benjymous

25-Feb-03 4:31

Then rescale the image in paintshop pro (or whatever) first

--
Help me! I'm turning into a grapefruit!

nitingonsalves25-Feb-03 4:40

25-Feb-03 4:40

Rescaling the image ends up distorting it. I am using Microsoft Photoeditor.

I'm definitely doing this the wrong way but don't know why.

Thanks
Nitin

will138325-Feb-03 5:13

will1383

25-Feb-03 5:13

You are doing it the right way. When you rescale the image in Photoeditor, you have to ensure you keep the aspect ratio the same, otherwise you will end up with a distorted image.

example:
the image you have is 400x800 pixels. This is a 1:2 ratio, so when you resize the 400 to say, 200, you then have to change the 800 by the same aspect ratio about, which is 50% here, so you would end up with a new image size of 200x400, which is smaller but still maintains the same aspect ratio and should not distort the image.

I hope this helps!

Dan Willis

nitingonsalves25-Feb-03 7:43