api coden wont work (C++ Learning Community)

im trying to make a second window for my game and its not createing the second window. im using dev-c++. here is the code

CODE

#include <windows.h>

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("GAMEWIN");
static TCHAR szSecAppName[] = TEXT ("STATD");
HWND hwnd;
HWND hwnds;
MSG msg;
WNDCLASS wndclass;
HWND hMenu;
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 = szAppName;
wndclass.lpszClassName = szAppName;

if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR);
return 0;
}
hwnd = CreateWindow (szAppName, // window class name
TEXT ("The Game"), // window caption
WS_OVERLAPPEDWINDOW, // window style
CW_USEDEFAULT, // initial x position
CW_USEDEFAULT, // initial y position
CW_USEDEFAULT, // initial x size
CW_USEDEFAULT, // initial y size
NULL, // parent window handle
NULL, // window menu handle
hInstance, // program instance handle
NULL); // creation parameters

hwnds = CreateWindow ( szSecAppName,
TEXT("STATS"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
150,
480,
hwnd,
NULL,
NULL,
NULL);
ShowWindow (hwnd, iCmdShow);
UpdateWindow (hwnd);
ShowWindow(hwnds,iCmdShow);
UpdateWindow(hwnds);
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg);
DispatchMessage (&msg);
}
return msg.wParam;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{

HDC hdc;
PAINTSTRUCT ps;
RECT rect;
static int xx=100;
static int yy=100;
switch (message)
{
case WM_CREATE:
return 0;
break;
case WM_KEYDOWN:
switch (wParam)
{
case VK_UP:
yy-=3;
InvalidateRect(hwnd, NULL, true);
break;

case VK_DOWN:
yy+=3;
InvalidateRect(hwnd, NULL, true);
break;

case VK_LEFT:
xx-=3;
InvalidateRect(hwnd, NULL, true);
break;

case VK_RIGHT:
xx+=3;
InvalidateRect(hwnd, NULL, true);
break;
case VK_ESCAPE:
PostQuitMessage (0);
break;
return 0;
}
case WM_PAINT:
hdc = BeginPaint (hwnd, &ps);
MoveToEx(hdc, xx, yy, NULL);
LineTo(hdc, xx+5, yy);
MoveToEx(hdc, xx+5, yy, NULL);
LineTo(hdc, xx+5, yy+5);
MoveToEx(hdc, xx+5, yy+5, NULL);
LineTo(hdc, xx, yy+5);
MoveToEx(hdc, xx, yy+5, NULL);
LineTo(hdc, xx, yy);
EndPaint (hwnd, &ps);
return 0;

case WM_DESTROY:
PostQuitMessage (0);
return 0;
}
return DefWindowProc (hwnd, message, wParam, lParam);
}

for some resone the second window is not dispplayd <_<

Well:

CODE

wndclass.lpszMenuName = szAppName;
wndclass.lpszClassName = szAppName;

Is that part ok? Do you have a class name string with the same menu resource name? :mellow:

I recommend that you use dialogs....

* My $0.02

cloudncali, I don't think you need szSecAppName, and the reason the second window doesn't appear is that you specify szSecAppName as the window class. (You only define szAppName.)

All you need to do is comment out line 9 and change line 44 so that the first parameter for hwnds's CreateWindow call is szAppName, not szSecAppName.

The following works fine on my computer:

CODE

#include <windows.h>

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("GAMEWIN");
// omitted: static TCHAR szSecAppName[] = TEXT ("STATD");
HWND hwnd;
HWND hwnds;
MSG msg;
WNDCLASS wndclass;
HWND hMenu;
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; // was szAppName; see Joel's message
wndclass.lpszClassName = szAppName;

if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR);
return 0;
}
hwnd = CreateWindow (szAppName,
TEXT ("The Game"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL); // creation parameters

hwnds = CreateWindow ( szAppName, // was: szSecAppName
TEXT("STATS"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
150,
480,
hwnd,
NULL,
NULL,
NULL);
ShowWindow (hwnd, iCmdShow);
UpdateWindow (hwnd);
ShowWindow(hwnds,iCmdShow);
UpdateWindow(hwnds);
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg);
DispatchMessage (&msg);
}
return msg.wParam;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{

HDC hdc;
PAINTSTRUCT ps;
RECT rect;
static int xx=100;
static int yy=100;
switch (message)
{
case WM_CREATE:
return 0;
break;
case WM_KEYDOWN:
switch (wParam)
{
case VK_UP:
yy-=3;
InvalidateRect(hwnd, NULL, true);
break;

case VK_DOWN:
yy+=3;
InvalidateRect(hwnd, NULL, true);
break;

case VK_LEFT:
xx-=3;
InvalidateRect(hwnd, NULL, true);
break;

case VK_RIGHT:
xx+=3;
InvalidateRect(hwnd, NULL, true);
break;
case VK_ESCAPE:
PostQuitMessage (0);
break;
return 0;
}
case WM_PAINT:
hdc = BeginPaint (hwnd, &ps);
MoveToEx(hdc, xx, yy, NULL);
LineTo(hdc, xx+5, yy);
MoveToEx(hdc, xx+5, yy, NULL);
LineTo(hdc, xx+5, yy+5);
MoveToEx(hdc, xx+5, yy+5, NULL);
LineTo(hdc, xx, yy+5);
MoveToEx(hdc, xx, yy+5, NULL);
LineTo(hdc, xx, yy);
EndPaint (hwnd, &ps);
return 0;

case WM_DESTROY:
PostQuitMessage (0);
return 0;
}
return DefWindowProc (hwnd, message, wParam, lParam);
}

Good luck with your game!

View Full Version: api coden wont work