Urgent Help: win32 problem

king_of_inismac

hey guys,

need some help with a win32 app.

The application will initially draw a grid on the window.

It will then acquire the data (fill an array)

Then i will used use the lineto function to draw a graph of the function.

heres what ive done so far:
1. within

<code>LRESULT WINAPI MainWndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)</code>

Ive put the following code to initialise the grid:

<code>case WM_PAINT:
hDC = BeginPaint(hwnd, &Ps);

hPen = CreateSolidBrush(RGB(0, 0, 0));
SelectObject(hDC, hPen);
etc...
</code?

This code draws the initial grid

2.
The user then clicks an "acquire data" button and a settings dialog box is displayed.

when they click ok, the data is acquired , and the wave should be drawn:

within
int CALLBACK AboutDlgProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam)....
case IDOK:
hDC = BeginPaint(hwnd, &Ps1);
hPen = CreatePen(PS_DASHDOTDOT, 1, RGB(255, 255,0 ));
SelectObject(hDC, hPen);

AquireData(averages);
for(i =0; i < 600; i++)
{
MoveToEx(hDC, 20+i,175+(ref_chan_average), NULL); LineTo(hDC, 21+i,175+(ref_chan_average[i+1] ));

}

EndPaint(hwnd, &Ps1)
break;

any ideas, guys,

the arrays is filling, but no drawing?

Thanks,
king

Merrion

You should add your drawing code to the WM_PAINT handler (check if the array is initialised first) - the use of BeginPaint and Endpaint outside of WM_PAINT processing is not a good idea....

See MSDN documentation of WM_PAINT for more info, and ...

If you must draw outside of the WM_PAINT handler use the function GetDC to get the hDC to draw on instead of BeginPaint...