Re: Output Printing - C / C++ / MFC Discussion Boards

David Crow14-Dec-04 9:48

14-Dec-04 9:48

Doug Knudson wrote:
Short of a separate thread

Why not create a separate thread to do the work? It would be the correct solution

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: Windows XP - Not Responding

Jim Howard14-Dec-04 11:39

Jim Howard

14-Dec-04 11:39

What you are describing is the textbook case for using a thread, your app must have some FUBAR'd design to preclude this.

But another alternative that doesn't always occur to us Windows guys is to just do the long calculation in a whole seperate process, using any of the several available windows interprocess communications techniques to keep your GUI informed on how things are going.

Re: Windows XP - Not Responding

Shog⁹14-Dec-04 11:51

Shog⁹

14-Dec-04 11:51

Well, you've got your other options. But as David said, putting it in a separate thread is The Right Way. That's kinda what they're meant for, after all.

FWIW, on Win2k and NT, Windows will also determine (at some point) that your app isn't responding. The difference under WinXP is that XP replaces your (unresponsive) window with a dummy window that displays the tile + "Not Responding", and allows the user to close it.

They did this because, after six years of being told that the primary thread was for keeping the UI responsive and to do real work in other threads, we still weren't writing responsive apps.

"The time has come," the Walrus said, "To talk of many things..."

Re: Windows XP - Not Responding

Blake Miller15-Dec-04 4:18

Blake Miller

15-Dec-04 4:18

Only six years WTF | :WTF:

I thought they have been rpeaching thread usage since Windows NT was released, back in something like 1993 D'Oh! | :doh:

Re: Windows XP - Not Responding

Shog⁹15-Dec-04 4:43

Shog⁹

15-Dec-04 4:43

Maybe. I was stuck on OS/2 then though.

"The time has come," the Walrus said, "To talk of many things..."

Re: Windows XP - Not Responding

Doug Knudson15-Dec-04 2:18

Doug Knudson

15-Dec-04 2:18

Hi all,

Oh, how I miss the days of my youth when there was only one "correct" way to solve every problem... and I was always sure what the "correct" solution was to everyone's problems, even when I had no idea of the circumstances of the other person's problem. Oh well, those days are gone and I am much older now Smile | :)

At any rate, the winner is... Ravi Bhavnani for his excellent reference to the article on periodically pumping messages to keep the dialog alive. My sincere thanks to Ravi!

Doug

Doug Knudson

Output Printing

BRIMID14-Dec-04 5:12

BRIMID

14-Dec-04 5:12

This is the code and it does not work. I am getting 5 error messages when compiling. If someone could give me assistance from //#include to //{ I would appreciate it. Do I have the function in the right place? That sort of thing. You guys have really been helpful. I want to be able to print the output of a C++ program after I compile,build, and run it. All I get now is an exe file with no option to print. Could anyone be of assistance to this novice?

#include <iostream>
#include <iomanip>
#include <cstdlib>
#include <string>
using std::cout;
using std::cin;
using std::fixed;
using namespace std;
//#include

int main() //(int,char*)
//{
//ofstream printer ("lpt1:");
//Printer <<"test"<<endl;
// return 0;
//}

{
int c;
double fee;
double total;
char a ='y', ans;
string input;
int number;

Thanks

Re: Output Printing

David Crow14-Dec-04 5:19

David Crow

14-Dec-04 5:19

Was this not answered here?

BRIMID wrote:
This is the code and it does not work. I am getting 5 error messages...

While you failed to indicate what those five error messages were, I would start by putting a closing brace at the end of main().

BRIMID wrote:
I want to be able to print the output of a C++ program after I compile,build, and run it. All I get now is an exe file with no option to print. Could anyone be of assistance to this novice?

Was this not of any help?

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: Output Printing

BlackDice14-Dec-04 5:22

BlackDice

14-Dec-04 5:22

I think you can get rid of these lines:

using std::cout;
using std::cin;
using std::fixed;

My articles

www.stillwaterexpress.com

BlackDice

Re: Output Printing

toxcct14-Dec-04 5:31

toxcct

14-Dec-04 5:31

sorry but, when i read your code, i can't see anything beetween //#include and

//{<br />

, except the main header.
Visibly, you are missing some code, or the <> were understood as HTML tags by IE

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Dead Code Detection

Aaron Schaefer14-Dec-04 4:46

Aaron Schaefer

14-Dec-04 4:46

Hi All,

Does anybody know of any simple tools that can be used to find dead code in Visual C++ code? What I am interested in specificaly is something that could identify things like:

Member variables declared in a class that are never referenced.
Member functions declared in a class that are never referenced, ie could safely be commented outwith no effect on code.
Classes that are defined and implemented, but not referenced in a solution, which could be safely removed.

Old code has a tendency to grow by accretion, and it would be good to be able to have some tool that would help to trim dead code.

Thanks

Re: Dead Code Detection

David Crow14-Dec-04 5:15

David Crow

14-Dec-04 5:15

I'm thinking that lint will do most, if not all, of what you require. It's been over a decade since I've used it but I remember it being a powerful ally.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: Dead Code Detection

Blake Miller15-Dec-04 4:23

Blake Miller

15-Dec-04 4:23

My first thought, also. I used to do just this with PC-Lint, and I think they have been keeping up with C++ and handling larger projects.

Check here: http://www.gimpel.com

I also use manual text file searching... slow but it gets the job done.

Socket Events Question

jerry1211a14-Dec-04 4:37

jerry1211a

14-Dec-04 4:37

////////////////////////////////////////////////////////////////
code segments:

static int gnWSNotifyMsg = RegisterWindowMessage(__FILE__ ":wsnotify");

ON_REGISTERED_MESSAGE(gnWSNotifyMsg, OnWinsockNotify)

This is called when an event occurs:
OnWinsockNotify(WPARAM, LPARAM lParam)

/////////////////////////////////////////////////////////////////
I am looking at some code that gives notification when a network event occurs on a socket.

1. Can someone tell me what __FILE__ ":wsnotify" means in the code above?

2. When I get an event, a user defined function "OnWinsockNotify()" is called. What are WPARAM, LPARAM lParam in the argument list above?

Thanks.
Jerry

Re: Socket Events Question

Iain Clarke, Warrior Programmer14-Dec-04 5:53

Iain Clarke, Warrior Programmer

14-Dec-04 5:53

1/
__FILE__ is a macro defined by the compiler. It
will be equal to "myfile.cpp" for example.
So the command could be:

static int gnWSNotifyMsg = RegisterWindowMessage("myfile.cpp" ":wsnotify");

which is equivalent to:

static int gnWSNotifyMsg = RegisterWindowMessage("myfile.cpp :wsnotify");

which makes the string that little more likely to be unique.

2/ As it is a message defined by you, YOU tell other people / yourself what you want WPARAM & LPARAM to be!

Oftern wParam would be flags of some sort, and lParam would actually be a pointer to something. Or you may have wParam be a thread ID, lParam not used, and the message is posted when a worker thread is finished.
etc, etc.

As you know *why* a message was registered, you'll know what you want it to do!

Iain.

icon issues of windows XP and 2K

includeh1014-Dec-04 3:16

includeh10

14-Dec-04 3:16

XP and 2K can display different images inside an exe icon,
do you know sizes of these images?

i.e. win 98 can display icon images in sizes of 16x16 and 32x32 pixels.

does XP and 2K support icon image of 64x64 pixels or more?

thx

includeh10

CAsyncMonikerFile

PetoG14-Dec-04 3:08

PetoG

14-Dec-04 3:08

Hi,
How can retrieve, if the connection failed or timeout,
when I call Open method from CAsyncMonikerFile? Because
there is thrown no CFileException exception, e.g. when
I put URL, which doesn't exists.

programmatically prevent dialog from resize and move

erkanina14-Dec-04 2:36

erkanina

14-Dec-04 2:36

How can I prevent a dialog from resize and move; and then enable.

Thanks for your responses.

Re: programmatically prevent dialog from resize and move

Blake Miller14-Dec-04 4:09

Blake Miller

14-Dec-04 4:09

Try processing this window message:

The WM_GETMINMAXINFO message is sent to a window when the size or position of the window is about to change. An application can use this message to override the window's default maximized size and position, or its default minimum or maximum tracking size.

If you set both sizes the same, I am pretty sure your window's size will not adjust. You just make its minimum and maximum size the same. I have not tested this exact behavior, however, it is just the first idea that came to mind.

Re: programmatically prevent dialog from resize and move

erkanina14-Dec-04 21:28

erkanina

14-Dec-04 21:28

Thanks for your response.
It will be very helpfull.

problem with writing to file

gamitech14-Dec-04 2:26

gamitech

14-Dec-04 2:26

I am trying to make a map of a file ant then write it in another file
but I cannot do it I get an error when writing can you please tell me why ?

HANDLE hMapFile,hFile;<br />
<br />
hMapFile=CreateFile("c:\\fish.txt",<br />
					GENERIC_READ|GENERIC_WRITE|0,<br />
					FILE_SHARE_DELETE|FILE_SHARE_READ|FILE_SHARE_WRITE,<br />
					NULL,<br />
					OPEN_EXISTING,<br />
					FILE_ATTRIBUTE_NORMAL,<br />
					NULL);<br />
<br />
hFile = CreateFileMapping(hMapFile,    // Current file handle. <br />
    NULL,                              // Default security. <br />
    PAGE_READWRITE,                    // Read/write permission. <br />
    0,                                 // Max. object size. <br />
    0,                                 // Size of hFile. <br />
    "MyFileMappingObject");            // Name of mapping object. <br />
 <br />
if (hMapFile == NULL) <br />
{ <br />
MessageBox(NULL,"error","",MB_OK);<br />
} <br />
LPVOID file;<br />
<br />
DWORD length;<br />
length=GetFileSize(hMapFile,0);<br />
<br />
file=(char *)malloc(length);<br />
file=MapViewOfFileEx(<br />
  hFile,   // handle to file-mapping object<br />
  FILE_MAP_ALL_ACCESS,<br />
  0,      // high-order DWORD of offset<br />
  0,       // low-order DWORD of offset<br />
  sizeof(hFile), // number of bytes to map<br />
  0<br />
);<br />
<br />
<br />
FILE *gabby;<br />
gabby=fopen("c:\\out.txt","w");<br />
fprintf(gabby,"%s",file);<br />
fclose(gabby);<br />

?????

gabby

Re: problem with writing to file

Iain Clarke, Warrior Programmer14-Dec-04 6:01

Iain Clarke, Warrior Programmer

14-Dec-04 6:01

You could always help us be telling us what the error you are getting is!

At a quick glance, you check the value of hMapFile after you use it to create a mapped object, but never check the return value of CreateFileMapping.

You may simply be using hFile & hMapFile the wrong way round in some places...

When you are debugging line by line, you can put

err,hr

in the watch window to see why functions are failing.

Iain.

Re: problem with writing to file

gamitech15-Dec-04 1:08

gamitech

15-Dec-04 1:08

man the thing is that there is a problem when trying to write , the rror is exactly when trying to write the lpvoid in the file. I don't know why?
WriteFile() also does not work.
but let me give you a hint first.
if write this line before writeing to the file
file=(char *)malloc(length); the code works fine but the file is full of null caracters
try the code yourself . . .see if you can do anyting

gabby

serial comm timeout problem?

doneirik14-Dec-04 2:19

doneirik

14-Dec-04 2:19

I´m writing an application that is communicating with an external device through the serial port (programming in VC++ .net with createfield etc). I am sending some characters to the device, end expect to get an answer. The problem is that I always get more characters back than I should.
I expect the characters “22001C” however, depending on the values of WriteTotalTimeoutMultiplier and WriteTotalTimeoutConstant I get replies like: “222001C” , “220001C” and “220011C” , always a character too much.
I think it is a problem with the timeout configurations, but I´m not sure, as I am just a beginner to c++.

Does anybody have a clue as to what might be the problem, and how to solve it ??

Best regards
doneirik

Re: serial comm timeout problem?

Roger Stoltz14-Dec-04 4:30

Roger Stoltz

14-Dec-04 4:30

If there is a problem with the data reception, I doubt the problem has anything to do with the timeout values for writing.
If the received data differs depending on your writing timeout values it's more likely you have a timing problem accessing the port.
If you have opened the port non-overlapped a reading operation will prevent a writing operation until it reaches its timeout and vice versa.

Are you sure that no other signals have to be manipulated such as DTR and/or RTS? Usually they have, try with HyperTerminal which sets both RTS and DTR to active state if you select no handshaking.
This is easily done with the DCB struct and SetCommState.

To nail down the real problem, try this:
1. Do not use read/write timeouts. MSDN tells you how to set this up.
2. Connect to another PC or COM-port and open it with HyperTerminal, see if you can receive expected data sent from HT.
Alternate 2: create a loop-back by connecting Rx and Tx (pin 2 and 3) and see if you can read the data you are sending.

Hope this helps
--
Roger

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.