C / C++ / MFC

18-May-04 14:27

i'm starting with MFC and drawing
i want to draw a consistent line when i click the mouse (with the function OnMouseMove). i tried with this, but it's not quite the result i want.

<br />
		CClientDC dc(this);<br />
		dc.MoveTo(point.x,point.y);<br />
		dc.LineTo(point.x+1,point.y+1);<br />

this is also not nice:

<br />
CClientDC dc(this);<br />
dc.Rectangle(point.x,point.y,point.x+2,point.y+2);

any ideas?
thanks!!!

Christian Graus18-May-04 18:30

Christian Graus

18-May-04 18:30

You need to remember each time the last point you drew to, and draw a line from the old point to the new point. I have a program here on CP that does it in GDI+, called doodle, from memory.

Man, that was a long time ago.

Christian

I have drunk the cool-aid and found it wan and bitter. - Chris Maunder

kfaday19-May-04 3:06

19-May-04 3:06

well, i tried with this code:

<br />
		CClientDC dc(this);<br />
		if ((p.x!=0)&&(p.y!=0))<br />
		{<br />
			dc.MoveTo(point.x, point.y);<br />
			dc.LineTo(p.x,p.y);<br />
		}<br />
		dc.MoveTo(point.x, point.y);<br />
		dc.LineTo(point.x+1, point.y+1);<br />
		p=dc.GetCurrentPosition();<br />

p is a CPoint variable that i added to the class, and in the constructor i initialize it with zero.
The problem is that when i draw by moving the mouse while it is clicked, and then i unclick the mouse, if i click it again somewhere else, it draws a line from the last point where i clicked to the new position.
any ideas?
thanks!

Christian Graus19-May-04 11:38

Christian Graus

19-May-04 11:38

Sure. Make that check if p.x and p.y are equal to negative one ( 0 is surely an acceptable value ) and set them both to negative one when the mouse button is raised.

Christian

I have drunk the cool-aid and found it wan and bitter. - Chris Maunder

kfaday19-May-04 14:41

NEW AT FUNCTIONS, PLEASE HELP, URGETNT

19-May-04 14:41

thanks!

ashrafak18-May-04 13:07

ashrafak

18-May-04 13:07

THE QUESTION REQUIRES US TO DESIGN A FUNCTION AS MENTIONED BELOW, AND EVERYTIME I DEBUG THE PROGRAM, IT GIVES ME ONLY ONE ERROR WHICH IS MENTIONED RIGHT AT TEH BOTTOM OF THE PAGE.

//Purpose::TO CONVERT A GIVEN SIX DIGIT INTEGER TO DATE FORMAT (dd/mm/yyyy)AND CHECK Y2K COMPLIANCE

#include "stdafx.h"
#using <mscorlib.dll>
using namespace System;

int D,DD,MM,YY;

void separateDate(int *temp,int *DD,int *MM,int *YY)
{
*DD=*temp/10000;
*MM=(*temp%10000)/100;
*YY=(*temp%10000)%100;

do
{
Console::WriteLine(S"\nEnter a Valid Date: ");
}
while (*DD<1 || *DD>31);
do
{
Console::WriteLine(S"\nEnter a Valid Date: ");
}
while (*MM<1 || *MM>12);

if (*YY<=36)
{
Console::WriteLine(S"\nTHE DATE IS: {0}/{1}/20{2}",*DD.ToString(),*MM.ToString(),*YY.ToString()); //h:\Visual Studio Projects\Y2k\Y2K.cpp(28): error C2228: left of '.ToString' must have class/struct/union type

}
else
if (*YY>36)
{
Console::WriteLine(S"\nTHE DATE IS: {0}/{1}/19{2}",*DD.ToString(),*MM.ToString(),*YY.ToString()); //h:\Visual Studio Projects\Y2k\Y2K.cpp(28): error C2228: left of '.ToString' must have class/struct/union type

}
}
int _tmain()
{
Console::WriteLine(S"*******************************************************************");
Console::WriteLine(S"\t\tDATE FORMAT");
Console::WriteLine(S"*******************************************************************");

void separateDate(int *temp, int *DD, int *MM, int *YY);
Console::Write(S"\nENTER THE DATE (SIX DIGIT POSITIVE INTEGER): ");
D=D.Parse(Console::ReadLine());
separateDate(&D,&DD,&MM,&YY);

Console::ReadLine();
return 0;
}

//h:\Visual Studio Projects\Y2k\Y2K.cpp(28): error C2228: left of '.ToString' must have class/struct/union type

I HAVE ALSO MENTIONED THE ERROR IN THE LINES IT OCCURS, PLEASE HELP, AM IN A TIGHT SPOT!! THANKS

Re: NEW AT FUNCTIONS, PLEASE HELP, URGETNT

Pablo Hernandez Valdes18-May-04 15:03

Pablo Hernandez Valdes

18-May-04 15:03

The problem is that the int C++ type is used, and it isn't a struct/class. You should use the System::Int32 type if you want to use the .ToString method. Smile | :)

#include "stdafx.h"<br />
#using <mscorlib.dll><br />
using namespace System;<br />
<br />
System::Int32 D,DD,MM,YY;<br />
void separateDate(System::Int32 *temp,System::Int32 *DD,System::Int32 *MM,System::Int32 *YY)<br />
{<br />
	*DD=*temp/10000;<br />
	*MM=(*temp%10000)/100;<br />
	*YY=(*temp%10000)%100;<br />
	do<br />
	{ <br />
		Console::WriteLine(S"\nEnter a Valid Date: ");<br />
	}<br />
	while (*DD<1 || *DD>31);<br />
	do<br />
	{<br />
		Console::WriteLine(S"\nEnter a Valid Date: ");<br />
	}<br />
	while (*MM<1 || *MM>12);<br />
<br />
	if (*YY<=36)<br />
	{<br />
		Console::WriteLine(S"\nTHE DATE IS: {0}/{1}/20{2}",(*DD).ToString(),(*MM).ToString(),(*YY).ToString());<br />
	}<br />
	else<br />
	if (*YY>36)<br />
	{<br />
		Console::WriteLine(S"\nTHE DATE IS: {0}/{1}/19{2}",(*DD).ToString(),(*MM).ToString(),(*YY).ToString());<br />
	}<br />
}<br />
int _tmain()<br />
{ <br />
	Console::WriteLine(S"*******************************************************************");<br />
	Console::WriteLine(S"\t\tDATE FORMAT");<br />
	Console::WriteLine(S"*******************************************************************");<br />
<br />
	void separateDate(System::Int32 *temp, System::Int32 *DD, System::Int32 *MM, System::Int32 *YY);<br />
	Console::Write(S"\nENTER THE DATE (SIX DIGIT POSITIVE INTEGER): ");<br />
	D=D.Parse(Console::ReadLine());<br />
	separateDate(&D,&DD,&MM,&YY);<br />
<br />
	Console::ReadLine();<br />
	return 0;<br />
}

Pablo Hernandez Valdes

Re: NEW AT FUNCTIONS, PLEASE HELP, URGETNT

Christian Graus18-May-04 18:31

Christian Graus

18-May-04 18:31

People are doing beginner courses in MC++ now ? What a travesty....

By the way, PLEASE DON'T YELL !!!!

Christian

I have drunk the cool-aid and found it wan and bitter. - Chris Maunder

Overloading operator== in derived classes

Wheatbread18-May-04 11:55

Wheatbread

18-May-04 11:55

I want to compare member variables that are in the derived class and not the base class.

Can I overload operator== for a derived class?? Or do I have to define one for the base class as well.

Thanks.
-C

Re: Overloading operator== in derived classes

kfaday18-May-04 15:19

Re: Overloading operator== in derived classes

18-May-04 15:19

Wheatbread wrote:
Can I overload operator== for a derived class??

yes you can

Wheatbread19-May-04 4:50

Wheatbread

19-May-04 4:50

Thanks

Where AM I ?

john john mackey18-May-04 11:52

john john mackey

18-May-04 11:52

CodeProject! Is there a simple way to determine file information about the current application you are in?

Specifically, I have an app called "MyApp.exe". I want to display its current file location, creation date, size, of my application in an "About" dialog.

If a user saves "MyApp.exe" to "d:\UsefulApps\MyApp.exe", then when I open the About dialog, it will tell me the current location is "d:\UsefulApps", created on "MM/dd/yyyy HH:mm:ss.sss", and file size "250 kb".

What file classes are available to get this info from inside the Application itself?

Thank you very much,
You all rock! Big Grin | :-D

Johnny

Garth J Lancaster18-May-04 12:05

Garth J Lancaster

18-May-04 12:05

you could try do a search hereabouts for 'versioninfo' or 'version info' - several authors have published articles about reading this from the resource buried in an exe. I dont know if it covers file size though, the obvious way of handling that is to get the exe name using a system call, then use one of the shell utilities or similar eg directory search to return the file size

hope this starts you on the right foot

'G'

vcplusplus18-May-04 12:23

vcplusplus

18-May-04 12:23

GetModuleFileName(...) will return the location where MyApp.exe was launched.
CFile::GetStatus(...) will return file size, time stamp, ...

TCHAR chFileName[_MAX_PATH]="";
GetModuleFileName(NULL, chFileName, sizeof(chFileName));
CFileStatus rStatus;
CFile::GetStatus(chFileName, rStatus);

Garth J Lancaster18-May-04 12:29

Garth J Lancaster

18-May-04 12:29

thanks for helping out .. on re-reading his question, he probably doesnt need 'version info' - and I'm flat maggot this am at the office and couldnt remember GerModuleFileName - I'd have had to do a search myself to find it ..

'G'