writing code for fullscreen game

[AndersMaj]

hello, i trying to create a fullscreen window buffer which can be written to for a point and click adventure game but i am finding problems with overwriting the windows taskbar and actually getting the pixels to display using SetDIBitsToDevice here is the code:


// Aboriginal Decay Demo.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "Aboriginal Decay Demo.h"

#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE hInst; // current instance
WCHAR szTitle[MAX_LOADSTRING]; // The title bar text
WCHAR szWindowClass[MAX_LOADSTRING]; // the main window class name
FILE *debugfile = NULL;
int screenxsize, screenysize;
char *screenbuffer;
BITMAPINFO screenbitmapinfo;

// Forward declarations of functions included in this code module:
ATOM MyRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
_In_opt_ HINSTANCE hPrevInstance,
_In_ LPWSTR lpCmdLine,
_In_ int nCmdShow)
{
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);

int x, y;
// TODO: Place code here.
fopen_s(&debugfile, "debug.txt", "w");
if (debugfile == NULL) {
return FALSE;
}
fprintf_s(debugfile, "opened debugfile...\n");
fflush(debugfile);
screenxsize = GetSystemMetrics(SM_CXFULLSCREEN);
screenysize = GetSystemMetrics(SM_CYFULLSCREEN); // there is SystemParametersInfo for SPI_GetWorkArea to allow taskbar
fprintf_s(debugfile, "screenxsize=%d, screenysize=%d\n", screenxsize, screenysize);
fflush(debugfile);
if ((screenbuffer = (char *)malloc(screenxsize*screenysize * 3)) == NULL) {
fprintf_s(debugfile, "cannot create screenbuffer...\n");
fflush(debugfile);
return FALSE;
}
for (y = 0; y < screenysize; y++) {
for (x = 0; x < screenxsize; x++) {
screenbuffer[(x + screenxsize * y) * 3] = 0;
screenbuffer[(x + screenxsize * y) * 3 + 1] = 0;
screenbuffer[(x + screenxsize * y) * 3 + 2] = 255;
}
}
screenbitmapinfo.bmiColors[0].rgbBlue = 0;
screenbitmapinfo.bmiColors[0].rgbGreen = 0;
screenbitmapinfo.bmiColors[0].rgbRed = 0;
screenbitmapinfo.bmiColors[0].rgbReserved = 0;
screenbitmapinfo.bmiHeader.biBitCount = 24;
screenbitmapinfo.bmiHeader.biClrImportant = 0;
screenbitmapinfo.bmiHeader.biSize = sizeof(BITMAPINFO);
screenbitmapinfo.bmiHeader.biWidth = screenxsize;
screenbitmapinfo.bmiHeader.biHeight = screenysize;
screenbitmapinfo.bmiHeader.biPlanes = 1;
screenbitmapinfo.bmiHeader.biCompression = BI_RGB;
screenbitmapinfo.bmiHeader.biSizeImage = 0;
screenbitmapinfo.bmiHeader.biXPelsPerMeter = 0;
screenbitmapinfo.bmiHeader.biYPelsPerMeter = 0;
screenbitmapinfo.bmiHeader.biClrUsed = 0;
// Initialize global strings
LoadStringW(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadStringW(hInstance, IDC_ABORIGINALDECAYDEMO, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);

// Perform application initialization:
if (!InitInstance(hInstance, nCmdShow))
{
return FALSE;
}

HACCEL hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_ABORIGINALDECAYDEMO));

MSG msg;



// Main message loop:
while (GetMessage(&msg, nullptr, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}

return (int) msg.wParam;
}



//
// FUNCTION: MyRegisterClass()
//
// PURPOSE: Registers the window class.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEXW wcex;

wcex.cbSize = sizeof(WNDCLASSEX);

wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = NULL;
wcex.hCursor = LoadCursor(nullptr, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = NULL; // MAKEINTRESOURCEW(IDC_ABORIGINALDECAYDEMO);
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

return RegisterClassExW(&wcex);
}

//
// FUNCTION: InitInstance(HINSTANCE, int)
//
// PURPOSE: Saves instance handle and creates main window
//
// COMMENTS:
//
// In this function, we save the instance handle in a global variable and
// create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
hInst = hInstance; // Store instance handle in our global variable

HWND hWnd = CreateWindowW(szWindowClass, szTitle, WS_POPUP,
0, 0, screenxsize, screenysize, nullptr, nullptr, hInstance, nullptr);

if (!hWnd)
{
return FALSE;
}

ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);

return TRUE;
}

//
// FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
// PURPOSE: Processes messages for the main window.
//
// WM_COMMAND - process the application menu
// WM_PAINT - Paint the main window
// WM_DESTROY - post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_PAINT:
{
fprintf_s(debugfile, "processing WM_PAINT...\n");
fflush(debugfile);
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hWnd, &ps);
// TODO: Add any drawing code that uses hdc here...
SetDIBitsToDevice(hdc, 0, 0, screenxsize, screenysize, 0, 0, 0, 0, screenbuffer, &screenbitmapinfo, 0);
EndPaint(hWnd, &ps);
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}

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