Re: Warning?

From:
"Ben Voigt" <rbv@nospam.nospam>
Newsgroups:
microsoft.public.vc.language
Date:
Tue, 20 Mar 2007 07:57:50 -0500
Message-ID:
<OWRsi8uaHHA.3520@TK2MSFTNGP04.phx.gbl>
"Kirit" <Kirit@discussions.microsoft.com> wrote in message
news:F0D91E66-7AC5-4442-95ED-785C8296F509@microsoft.com...

return DefWindowProc (hwnd, message, wParam, lParam);
Try to find above function return what value is it in integer or string or
boolean


DefWindowProc and WndProc both return LRESULT, that's no problem.

"Ross" wrote:

Hello,

I am trying one of my very first windows program and I am getting the
following warning:

c:\DATASOURCE_EXTRA\Programming\VC++CodeTesting_WINDOWS\TESTING_CPZ\HangTheMan_ProgTest1\HTM.C(51)
: warning C4244: 'return' : conversion from 'WPARAM' to 'int', possible
loss
of data


I'm suspecting this is occurring on the return from WinMain. You can either
cast the value, or else use ExitProcess instead of return. Either one will
eliminate the warning.

Here is my code:

#include <windows.h>
#include "HTM.h"

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);
const int NUMLINES = (sizeof Words) / (sizeof Words[0]);

//My functions
void DrawOptions(HDC,HWND,BOOL,BOOL,int);

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInnstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("HTM");
HWND hwnd;
MSG msg;
WNDCLASS wndclass;

wndclass.style = CS_HREDRAW |CS_VREDRAW;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szAppName;

if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("xxx"),szAppName, MB_ICONERROR);
return 0;
}

hwnd = CreateWindow (szAppName, TEXT ("HTM ! "),

WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL);

ShowWindow(hwnd, iCmdShow);
UpdateWindow (hwnd);

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

LRESULT CALLBACK WndProc (HWND hwnd, UINT message,
                                              WPARAM wParam, LPARAM
lParam)
{
static int cxChar, cxCaps, cyChar, cxClient, cyClient;
HDC hdc;
static int i;
PAINTSTRUCT ps;
TCHAR szBuffer[10];
TEXTMETRIC tm;
static int ColorTYPE = 1;

switch (message)
{
case WM_CREATE:
 hdc = GetDC (hwnd);

GetTextMetrics (hdc, &tm);
cxChar = tm.tmAveCharWidth;
cxCaps = (tm.tmPitchAndFamily & 1 ? 3 : 2) * cxChar / 2;
cyChar = tm.tmHeight + tm.tmExternalLeading;

ReleaseDC (hwnd, hdc);

return 0;

 case WM_SIZE:
cxClient = LOWORD(lParam);
cyClient = HIWORD(lParam);
        return 0;

case WM_PAINT:
               hdc = BeginPaint (hwnd, &ps);

              //MESSAGE BOARD COLORS
DrawOptions(hdc,hwnd,TRUE,TRUE,ColorTYPE);

for (i = 0; i < NUMLINES; i++)
{
TextOut (hdc,0,cyChar * i,Words[i].szWord,
     lstrlen(Words[i].szWord));

TextOut (hdc,20 * cxChar,cyChar * i,szBuffer,
wsprintf(szBuffer,TEXT("%2d"),Words[i].iWLenght));

}
EndPaint (hwnd, &ps);
return 0;

case WM_DESTROY:
PostQuitMessage (0);
return 0;
}

return DefWindowProc (hwnd, message, wParam, lParam);
}

void DrawOptions(HDC hdc,HWND hwnd,BOOL b_OPAQUE,
                        BOOL b_GRAYBRUSH,int i_ColorTYPE)
{
//Windows objects
HBRUSH hBrush;

//CHOICE OF OPAQUE OR TRANSPARENT
if (b_OPAQUE == TRUE)
{SetBkMode(hdc,OPAQUE);
 SetBkColor(hdc,0);}
else
  {SetBkMode(hdc,TRANSPARENT);
  SetBkColor(hdc,22000);}

  //CHOICE OF COLOR TYPE
  if (i_ColorTYPE == 1)
    {SetTextColor(hdc,65535);}
  else if (i_ColorTYPE == 2)
    {SetTextColor(hdc,16777215);}
  else if (i_ColorTYPE == 3)
    {SetTextColor(hdc,9999);}

//SELECT BRUSH COLOR
if (b_GRAYBRUSH == TRUE)
{hBrush = (HBRUSH) GetStockObject(GRAY_BRUSH);}
else
{hBrush = (HBRUSH) GetStockObject(WHITE_BRUSH);}

//SELECT THE BRUSH INTO THE DEVICE CONTEXT
SelectObject(hdc,hBrush);

//DISPLAY RECTANGLE
Rectangle(hdc,0,0,300,300);
}

I have seen this warning before, but now I don't know how to get rid of
it !

Please help, anyone,
Ross

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