C / C++ / MFC

Re: win32 API - How to use a button

21-Sep-06 6:56

gunner_uk2000 wrote:
if(true) //have no idea what to put in here to work out which button was press.

if (hwndButton == hwnd)
   ...

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gunner_uk200021-Sep-06 23:23

gunner_uk2000

21-Sep-06 23:23

That does not work, as it returns false when the hwndButton was clicked.

It also generate a compiler warning.

I i understand correctly hwndButton is a handle to the button, and hwnd is a handle to the window, so i don't see how checking if they are equal (which they will not be) will determin which button was pressed.

Correct me if i'm wrong.

Re: win32 API - How to use a button [modified]

David Crow22-Sep-06 3:01

Re: win32 API - How to use a button

22-Sep-06 3:01

gunner_uk2000 wrote:
I i understand correctly hwndButton is a handle to the button, and hwnd is a handle to the window...

A button is a window.

The ninth argument to CreateWindow() is supposed to be the ID associated with the button control. You're using NULL. When a control generates a message, it is sent to the parent window. Processed messages are typically not sent to DefWindowProc().

You should have:

hwndButton = CreateWindow(..., (HWND) MY_BUTTON, ...);
...
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
    case WM_COMMAND:
        if (LOWORD(wParam) == MY_BUTTON)
            MessageBox();
        return 0;
    default:
        return DefWindowProc(hwnd, msg, wParam, lParam);
}

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

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

susiriss22-Sep-06 3:25

susiriss

22-Sep-06 3:25

When you create the button, set the hMenu parameter of CreateWindow to some resource ID such as IDC_MYBUTTON1. Define a value for this constant in your resource.h header file or some other place you want. Then in WndProc, switch the low-word of wParam which sends you the ID of the message source as

case WM_COMMAN:<br />
switch(LOWORD(wParam))<br />
{<br />
   case IDC_MYBUTTON1:<br />
       // you are here when you click IDC_MYBUTTON1<br />
<br />
   case IDC_MYBUTTON2:<br />
//....blaa bla.bla

Enjoy...!

Shell open with

Mohammad A Gdeisat21-Sep-06 6:13

Mohammad A Gdeisat

21-Sep-06 6:13

hi
I am programming for windows ce, and I need to know how to change a file type association using c++, what functions should I call to change the program that opens a specific file type (eg: .mp3)???

Thanks alot

Mohammad

And ever has it been that love knows not its own depth until the hour of separation

array input using edit box

Cyclone0221-Sep-06 5:27

Cyclone02

21-Sep-06 5:27

Hi guys

I have been trying to make an app that gets the arra input from the user for ex:

I have made a variable for an edit box and named it BYTE m_bytes then i make another edit box and add the variable BYTE m_arrayinput thne i make a function like this:

void whatever()<br />
{<br />
     UpdateData(true);<br />
     <br />
     BYTE myarray[m_bytes] = {m_arrayinput};<br />
}

now what i want to do with this code is to for example the user enters:

Bytes: 2<br />
<br />
Array Input: 0x60, 0x90

then i want the function to interpret it as:

void whatever()<br />
{<br />
     UpdateData(true);<br />
     <br />
     BYTE myarray[2] = {0x60, 0x90};<br />
}

but this code does not work and i havnt got a clue of how to make it work so could someone please help me?

Thanks in advance

Cyclone

Zac Howland21-Sep-06 5:39

Zac Howland

21-Sep-06 5:39

Cyclone02 wrote:
BYTE myarray[2] = {0x60, 0x90};

This won't work that way. The CEdit data is a string, so you will have to parse that string and assign it to each element in the array.

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

David Crow21-Sep-06 6:59

21-Sep-06 6:59

Cyclone02 wrote:
I have made a variable for an edit box and named it BYTE m_bytes...

You should be using a CEdit member variable for an edit control.

Cyclone0221-Sep-06 7:15

Cyclone02

21-Sep-06 7:15

for both of the variables? or just the bytes one?

David Crow21-Sep-06 7:28

21-Sep-06 7:28

For the one associated with the edit control. That way all you have to do is call SetWindowText() or GetWindowText() (into a CString object).

Call Windows Explorer after save files

Cyclone0222-Sep-06 5:59

Cyclone02

22-Sep-06 5:59

i tried doing that but it doesnt work i made a variable called CEdit m_bytes then i did this to the array:

Array[m_bytes] = {m_patch};

but all i got were a lot of errors Frown | :(

Max++21-Sep-06 5:19

Max++

21-Sep-06 5:19

I want to save some file to harddisk such as C:\\Data\\Mydata.txt and then I want to call Window Explorer to open at the page" C:\\Data" automatically.

Anybody know, how to write the code for this issue.

Re: Call Windows Explorer after save files

toxcct21-Sep-06 5:39

toxcct

21-Sep-06 5:39

::ShellExecute(NULL, "open", "C:\\Data", NULL, NULL, SW_SHOW);

TOXCCT >>> GEII power

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

Dialog don't get focus back [modified]

jsumm21-Sep-06 4:34

jsumm

21-Sep-06 4:34

Hello,

how can I set the focus to my SDI-applications toplevel window?
Problem: I have an application. The main dialog creates dynamically a subdialog which is displayed and has the focus. This subdialog creates and executes a thread. This thread creates also dynamically a (error-)dialog which is closed by buttonclick or automatically after some seconds. After the thread created subdialogs closes, I want to have back the focus on my applications top level window, which is the window who creates the thread. Til now, the main dialog receives the focus.
Any ideas?

Thanks
Juergen

-- modified at 10:55 Thursday 21st September, 2006

Comparing enum types

Waldermort21-Sep-06 4:25

Waldermort

21-Sep-06 4:25

Just changed a few #defines into enum, and now getting compiler errors. How are enum types compared?

typedef enum tile_from_t 
{ 
NORTH=0,EAST,SOUTH,WEST
} TILEFROM, SEAT, *LPSEAT;

bool cTiles::VerifySeat( const LPSEAT sSeat )
{
    switch ( m_sNumPlayers )
    {
    case 2:
        if ( sSeat == NORTH || sSeat == SOUTH )
            return true;
    case 3:
        if ( sSeat >= EAST && sSeat <= WEST )
            return true;
    case 4:
        if ( sSeat >= NORTH && sSeat <= WEST )
            return true;
    default:
        return false;
    }
}

Zac Howland21-Sep-06 4:44

Zac Howland

21-Sep-06 4:44

waldermort wrote:
bool cTiles::VerifySeat( const LPSEAT sSeat )

waldermort wrote:
if ( sSeat == NORTH || sSeat == SOUTH )

You are comparing the pointer to the enum constants here. You can avoid this by just declaring the method as:

bool cTiles::VerifySeat(SEAT sSeat)

Using a const-reference or pointer for this method doesn't gain you anything.

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac

Waldermort21-Sep-06 5:21

Waldermort

21-Sep-06 5:21

Doh!!

Another question if I may.
Is it possible to increase the enum type? In my previous code I used this formula to get the next seat
m_sActiveSeat = (m_sActiveSeat+1)%4;
However this cause the compile error
cannot convert from 'int' to 'enum tile_from_t'
I also tried
m_sActiveSeat++
which would be great if it wrapped around, but still no success.

Is there a simple way to do this rather than using a switch?

Zac Howland21-Sep-06 5:36

Zac Howland

21-Sep-06 5:36

enums in C++ are basically just named integer constants. They won't wrap around automatically. You can write your own wrapper for Enums (I actually have an article on here somewhere that makes a pretty good cut at it), or you can use const int's instead. Since you said you were coming from #define's, I would recommend using the latter.

const unsigned long NORTH = 0;
const unsigned long EAST = 1;
const unsigned long SOUTH = 2;
const unsigned long WEST = 3;

// and the function call
void myFunc(unsigned long direction)
{
	switch (direction)
	{
	case NORTH:
	case SOUTH:
	case EAST:
	case WEST:
		doSomething();
		break;
	default:
		throw exception("Oooops!");
	}
}

To make sure it is always valid, you could use your modulo operation as well.

If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week

Zac