E , lipny błąd , wymagane było rzutowanie wartości zwracanej .
Pozostaje kwestia skalowania bitmapy do rozmiaru okna .
To działa pod Dev , tylko wrzuć własną nazwę bitmapy ..
#include <windows.h>
//------------------------------------------------------------------------------
class bitmapa {
BITMAP bm;
HBITMAP hbmpMyBitmap, hbmpOld;
HDC hdcMemory ;
public :
int x , y ;
bitmapa(const char*,HINSTANCE) ;
void Show_Bmp(HDC) ;
};
//------------------------------------------------------------------------------
/*********************************************************/
bitmapa::bitmapa(const char*nazwa,HINSTANCE zad_a)
{
hbmpMyBitmap= (HBITMAP)LoadImage(zad_a/*HINSTANCE*/,nazwa, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
GetObject( hbmpMyBitmap,sizeof(BITMAP), &bm);
x = bm.bmWidth ;
y = bm.bmHeight ;
}
/*************************************************************/
void bitmapa::Show_Bmp(HDC h_dc)
{
hdcMemory = CreateCompatibleDC(h_dc);
hbmpOld = (HBITMAP)SelectObject(hdcMemory,hbmpMyBitmap);
BitBlt(h_dc,0,0,bm.bmWidth,bm.bmHeight,hdcMemory,0,0,SRCCOPY);
SelectObject(hdcMemory, hbmpOld);
DeleteDC(hdcMemory);
}
//------------------------------------------------------------------------------
/* Declare Windows procedure */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
/* Make the class name into a global variable */
char szClassName[ ] = "WindowsApp";
bitmapa*wsk_bmp ;
int WINAPI WinMain (HINSTANCE hThisInstance,
HINSTANCE hPrevInstance,
LPSTR lpszArgument,
int nFunsterStil)
{
HWND hwnd; /* This is the handle for our window */
MSG messages; /* Here messages to the application are saved */
WNDCLASSEX wincl; /* Data structure for the windowclass */
/* The Window structure */
wincl.hInstance = hThisInstance;
wincl.lpszClassName = szClassName;
wincl.lpfnWndProc = WindowProcedure; /* This function is called by windows */
wincl.style = CS_DBLCLKS; /* Catch double-clicks */
wincl.cbSize = sizeof (WNDCLASSEX);
/* Use default icon and mouse-pointer */
wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName = NULL; /* No menu */
wincl.cbClsExtra = 0; /* No extra bytes after the window class */
wincl.cbWndExtra = 0; /* structure or the window instance */
/* Use Windows's default color as the background of the window */
wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
/* Register the window class, and if it fails quit the program */
if (!RegisterClassEx (&wincl))
return 0;
/****************************************************/
wsk_bmp = new bitmapa("C:\\portop.bmp",hThisInstance) ; ///<<<<<<<<<<<<<<<< TU ŁADUJEMY I TWORZYMY BMP
/****************************************************/
/* The class is registered, let's create the program*/
hwnd = CreateWindowEx (
0, /* Extended possibilites for variation */
szClassName, /* Classname */
"Windows App", /* Title Text */
WS_OVERLAPPEDWINDOW, /* default window */
CW_USEDEFAULT, /* Windows decides the position */
CW_USEDEFAULT, /* where the window ends up on the screen */
544, /* The programs width */
375, /* and height in pixels */
HWND_DESKTOP, /* The window is a child-window to desktop */
NULL, /* No menu */
hThisInstance, /* Program Instance handler */
NULL /* No Window Creation data */
);
/* Make the window visible on the screen */
ShowWindow (hwnd, nFunsterStil);
/* Run the message loop. It will run until GetMessage() returns 0 */
while (GetMessage (&messages, NULL, 0, 0))
{
/* Translate virtual-key messages into character messages */
TranslateMessage(&messages);
/* Send message to WindowProcedure */
DispatchMessage(&messages);
}
/* The program return-value is 0 - The value that PostQuitMessage() gave */
return messages.wParam;
}
/* This function is called by the Windows function DispatchMessage() */
LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message) /* handle the messages */
{
case WM_DESTROY:
delete wsk_bmp ; // <<===== zniszczenie obiektu
PostQuitMessage (0); /* send a WM_QUIT to the message queue */
case WM_PAINT :
{
PAINTSTRUCT paint;
HDC kont = BeginPaint(hwnd,&paint);
/************************************************/
wsk_bmp -> Show_Bmp(kont) ; // <<<++++ TU NIE ŁADUJEMY , TYLKO WYSWIETLAMY
/************************************************/
EndPaint(hwnd,&paint);
return 0;
}
default: /* for messages that we don't deal with */
return DefWindowProc (hwnd, message, wParam, lParam);
}
return 0;
}
PS> Weź ten szkielet kodu w*ol resztę , jak juz powiedzie się wyświetlenie bmp dokładaj resztę , bo zginiesz w tym makaronie ...