C / C++ / MFC Discussion Boards

Ehsan Baghaki19-Dec-02 22:32

19-Dec-02 22:32

i am trying to findout if there are a Line Class in MFC.
for example in a Specified Device Context i want to define a Line Object with 2 attributes
1. Source-Cpoint
2. Destination-Cpoint

if i change the Source-CPoint of a Line Object in a DC then Line changes in that DC.

Re: Line Object in MFC!

Iain Clarke, Warrior Programmer19-Dec-02 22:49

Iain Clarke, Warrior Programmer

19-Dec-02 22:49

There is no actual line object per se in MFC, but as it is just two points, its not difficult to
roll one yourself.

You could either make a new class / struct with two point members:

struct CLine
{
    CPoint ptStart;
    CPoint ptFinish;

    void   DrawLine (CDC *pDC)
    {
        pDC->MoveTo (ptStart);
        pDC->LineTo (ptFinish);
    }
};

Or just use a CRect to store your coordinates, and use .TopRight () as one end, and BottomRight () as the
other, which is what I do.

Most of the time I want to draw a bunch of lines, so PolyPolyLine is superior anyway even if is not included
in CDC...

Iain.

Re: Line Object in MFC!

Jörgen Sigvardsson21-Dec-02 10:09

Jörgen Sigvardsson

21-Dec-02 10:09

Why not

class CShape {
public:
    virtual void Draw(CDC* pDC) const = 0;
    virtual ~CShape();
};

class CLine : public CShape {
public:
    CPoint ptStart;    
    CPoint ptFinish;    
    
    CLine(const CPoint& ps, const CPoint& pf) : ptStart(ps), ptFinish(pf) { }
    void Draw(CDC *pDC) const {
        pDC->MoveTo (ptStart);
        pDC->LineTo (ptFinish);
    }
};

Then you can start adding other shapes to your system. Smile | :)

--
Only in a world this sh*tty could you even try to say these were innocent people and keep a straight face.

Changing the font of editor

Anonymous19-Dec-02 22:22

Anonymous

19-Dec-02 22:22

I run my VC on a Simplify Chinese Windows 98 . The font which could be selected of the VC editor is limit, only 5 types can be selected. I know it is different from the English Version of Windows. So I want to know how to make more font selections. Do I need to modify the registery table? Thanks!

Drawedge with custom color..

Neha19-Dec-02 21:53

Neha

19-Dec-02 21:53

Hi,
I have written this to draw the edge.

DrawEdge(pDC->m_hDC, &rect, BDR_SUNKENINNER , BF_BOTTOMRIGHT | BF_ADJUST);

Now i want to cahnge the edge color ,How can i do that?

Resource Strings vs. CStrings

Alexandru Savescu19-Dec-02 21:00

Alexandru Savescu

19-Dec-02 21:00

I have some messages that are dispalyed in my application (error messages, welcome messages).

I was wodering what is the best way to define those strings:

1. in a resource file, or

2. define my own const CString object in a common header file.

I would like to hear your pros and cons on both options.

Thanks!

Best regards,
Alexandru Savescu

P.S. Interested in art? Visit this!

Re: Resource Strings vs. CStrings

jhwurmbach19-Dec-02 21:17

jhwurmbach

19-Dec-02 21:17

If you ever think of doing something like localisation, resources are the way to go (probably even a resource DLL).
But if you are happy with one (or maybe very few, with different binaries) languages, you can probably stay with const strings in your application.

Both are Unicode-ready, but when you choose english as your applications language, you will probably not need this.

Just my 2 Euro-cents

"My opinions may have changed, but not the fact that I am right."
Found in the sig of Herbert Kaminski

Change CWnd object BackGround Color

HellShrimp4free19-Dec-02 20:52

HellShrimp4free

19-Dec-02 20:52

i have searched all over the MSDN to find a Function to chand this attribute
is there and Class Member of CWnd that can change the BackGround (of ForeGround )Color or Text Color.

tnx

Fight with the Best
Die like the Rest

Re: Change CWnd object BackGround Color

jhwurmbach19-Dec-02 21:20

jhwurmbach

19-Dec-02 21:20

To draw on a Windows pane, you need a windows device context (DC), which with MFC comes wrapped up in a CDC class. If you look in MSDN for CDC, you will find all sorts of drawing stuff.

"My opinions may have changed, but not the fact that I am right."
Found in the sig of Herbert Kaminski

Draw a Bitmap over the Window.

Ehsan Baghaki19-Dec-02 20:24

Ehsan Baghaki

19-Dec-02 20:24

i want to know how i can Draw a bitmap on a Window.
when i make a window and draw a Bitmap on it the window is still at top and my bitmap goes under the window:

cw=new CWnd;
cw->Create(_T("STATIC"), "99",WS_VISIBLE |WS_THICKFRAME ,CRect(0, 0, 20,20), this, 0xffff);
.
.
.
pDC->BitBlt(point.x-10,point.y-10,bm.bmWidth,bm.bmHeight,dc,0,0,SRCAND);

whats wrong ?

if anybody has a suggestion for attach a BitMap to a Window plz tell me.

Re: Draw a Bitmap over the Window.

Christian Graus19-Dec-02 20:31

Christian Graus

19-Dec-02 20:31

Well, for starters, you're SRCANDing the bitmap over the window, I think SRCCOPY might be what you want, but I cannot remember, to be honest. Second, where are you drawing this ? It should be in OnEraseBackground.

How do you know it goes under the Window, surely the Window would cover it if it did ?

Christian

No offense, but I don't really want to encourage the creation of another VB developer.
- Larry Antram 22 Oct 2002

C# will attract all comers, where VB is for IT Journalists and managers - Michael
P Butler 05-12-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not
as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

Separete the file extension from a filename

Rickard Andersson²⁰19-Dec-02 20:24

Rickard Andersson²⁰

19-Dec-02 20:24

This makes me me crazy!

Tell me the C functions that can help me to separete the extension of a string like myfile.jpg.

thus, I only want the .jpg to be left.

And again, just tell me what C functions that perhaps help me with this. I want to build the code myself because this is a pretty much simple thing. I don't want sample code

Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C#, ASP.NET and C++!

Re: Separete the file extension from a filename

Christian Graus19-Dec-02 20:32

Christian Graus

19-Dec-02 20:32

Why do you want C, as opposed to C++ ? In C, I'd probably just step back a char at a time, so use strlen to find out how long the string is, and step backwards.

Christian

No offense, but I don't really want to encourage the creation of another VB developer.
- Larry Antram 22 Oct 2002

C# will attract all comers, where VB is for IT Journalists and managers - Michael
P Butler 05-12-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not
as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

Re: Separete the file extension from a filename

Rickard Andersson²⁰19-Dec-02 20:46

Rickard Andersson²⁰

19-Dec-02 20:46

Christian Graus wrote:
Why do you want C, as opposed to C++ ?

What you actually is saying is: Use std::string instead!
right? Smile | :)

I never learn to use that!

Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C#, ASP.NET and C++!

Re: Separete the file extension from a filename

Christian Graus19-Dec-02 21:04

Christian Graus

19-Dec-02 21:04

Rickard Andersson wrote:
I never learn to use that!

So now's your chance.

But I seriously thought when you said C, you meant C. What else would I think ?

Christian

No offense, but I don't really want to encourage the creation of another VB developer.
- Larry Antram 22 Oct 2002

C# will attract all comers, where VB is for IT Journalists and managers - Michael
P Butler 05-12-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not
as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

Re: Separete the file extension from a filename

Rickard Andersson²⁰20-Dec-02 3:28

Rickard Andersson²⁰

20-Dec-02 3:28

Christian Graus wrote:
What else would I think ?

You would think C! Smile | :)

I will update my socket class library to usec std::string instead of char* to make it more objectoriented.

Mary christmas every one!

Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C#, ASP.NET and C++!

Re: Separete the file extension from a filename

Fredrik Skog19-Dec-02 20:36

Fredrik Skog

19-Dec-02 20:36

_splitpath ?

Cheers,
Fredrik

"Felix qui potuit rerum cognoscere causas."

Re: Separete the file extension from a filename

Jörgen Sigvardsson21-Dec-02 10:15

Jörgen Sigvardsson

21-Dec-02 10:15

using namespace std;
 
string string strExtension;
string strFileName = "myfile.jpg";
size_t nLastDotIndex = strFileName.find_last_of('.');
if(npos == nLastDotIndex)
    cout << "Error! No extension" << endl;
else
    strExtension = strFileName.substr(nLastDotIndex + 1);

--
Only in a world this sh*tty could you even try to say these were innocent people and keep a straight face.

Re: Separete the file extension from a filename

Al_Pennyworth23-Dec-02 2:50

Al_Pennyworth

23-Dec-02 2:50

I agree, use _splitpath. You may not want it, but it will give you the drive, dir, filename, and ext. It is only one line of code...

detect mouse click

king_of_the_world19-Dec-02 18:37

king_of_the_world

19-Dec-02 18:37

hi guys, I want to be able to detect mouse click on the desktop(not just any particular application window) Smile | :)

, how do I do that? any sample code/suggestion is appreciated

Re: detect mouse click

Taka Muraoka19-Dec-02 18:51

Taka Muraoka

19-Dec-02 18:51

SetWindowsHookEx() with WH_MOUSE is probably what you want.

he he he. I like it in the kitchen! - Marc Clifton (on taking the heat when being flamed)

Awasu v0.4a[^]: A free RSS reader with support for Code Project.

Re: detect mouse click

king_of_the_world19-Dec-02 19:08

king_of_the_world

19-Dec-02 19:08

would you elaborate on it a little? sorry I'm a bit new to windows programming

thanks

Re: detect mouse click

Taka Muraoka19-Dec-02 19:12

Taka Muraoka

19-Dec-02 19:12

Have a look in the MSDN.

You call SetWindowsHookEx() with a pointer to a function that you supply. Windows will then call this function every time something mouse-related happens, giving you the HWND that the event is for, where the mouse is on screen, etc.

Since there may be more than one program listening for these mouse events, you need to make sure that you pass the event on, by calling CallNextHookEx().

he he he. I like it in the kitchen! - Marc Clifton (on taking the heat when being flamed)

Awasu v0.4a[^]: A free RSS reader with support for Code Project.

Re: detect mouse click

king_of_the_world20-Dec-02 1:15

king_of_the_world

20-Dec-02 1:15

thanks for the pointer, now I still have some problem of getting it to work,
I have the following callback procedure that tries to show the mouse position

LRESULT CALLBACK MouseProc(int nCode, WPARAM wParam, LPARAM lparam){
MOUSEHOOKSTRUCT* mousehook=(MOUSEHOOKSTRUCT*)lparam;
POINT p=mousehook->pt;
char temp[20];
sprintf(temp,"mouse position is %d %d",p.x,p.y);
MessageBox(hWnd,temp,"",MB_OK);
return 0;
}

and I did SetWindowsHookEx(WH_MOUSE, 0,hInstance,0); but MouseProc was never been called for some reason, what did I do wrong, the following is my code in detail:

int PASCAL WinMain(HINSTANCE hInstance, HINSTANCE hPrev, LPSTR lpCmdLine, int Cmd) {

MSG msg;

// Setup and register the window class;

WNDCLASS wClass;
wClass.style =CS_HREDRAW|CS_VREDRAW;
wClass.lpfnWndProc =WindowProcedure; // callback-function;
wClass.cbClsExtra =0;
wClass.cbWndExtra =0;
wClass.hInstance =hInstance;
wClass.hIcon =LoadIcon(hInstance,IDI_APPLICATION);
wClass.hCursor =LoadCursor(NULL,IDC_ARROW);
wClass.hbrBackground =(HBRUSH)(COLOR_WINDOW+3);
wClass.lpszMenuName =NULL;
wClass.lpszClassName =WINDOWNAME;

RegisterClass(&wClass);

// Create the window and store the handle;

hWnd = CreateWindow(WINDOWNAME, // class name;
WINDOWNAME, // window name;
WS_OVERLAPPEDWINDOW, // window style;
CW_USEDEFAULT, CW_USEDEFAULT, // starting position (x,y);
320, 240, // width and height;
NULL, // parent handle;
NULL, // menu handle;
hInstance, // instance handle;
NULL); // other parameters;

// Check if window creation failed; otherwise show and update;

if(hWnd==NULL) return FALSE;
else {

ShowWindow (hWnd, Cmd);
UpdateWindow(hWnd);
}

HOOKPROC hookproc;
//static HINSTANCE hinstDLL;
static HHOOK hhook;

SetWindowsHookEx(WH_MOUSE, 0,hInstance,0);

// Message loop;

while(GetMessage(&msg,NULL,0,0)) {
TranslateMessage(&msg);
DispatchMessage (&msg);
}
return msg.wParam;
}

Re: detect mouse click

Taka Muraoka20-Dec-02 1:28

Taka Muraoka

20-Dec-02 1:28

I was actually playing with this stuff the other day and couldn't get it work like this either Smile | :)

I had to pass in the current thread ID when setting the hook i.e. call GetCurrentThreadId(). So it should work OK as long as everything is in the one thread, which it is for me. If you really want a global hook or for this work for multiple threads, you're on your own!

BTW, I wouldn't call MessageBox() inside your hook procedure. This function is going to get called a *lot*, from deep inside Windows, and it's probably not going to like you trying to display a dialog box. Log it to a file instead,

he he he. I like it in the kitchen! - Marc Clifton (on taking the heat when being flamed)

Awasu v0.4a[^]: A free RSS reader with support for Code Project.

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