switch win32 console application to graphics mode - c++

Question

I want to switch my win32 console application to graphics mode to use SetPixel function to draw lines:
#include "stdafx.h"
int _tmain(int argc, _TCHAR* argv[])
{
//code to switch to graphics mode
return 0;
}
please advice :)

Answer 1

Here's a fine SetPixel() example.
Create a win32 application project , paste the code and compile it
//header files to include
#include<windows.h>
#include<stdlib.h>
#include<time.h>
//application title
#define APPTITLE "Hello World"
//function prototypes (forward declarations)
BOOL InitInstance(HINSTANCE, int);
ATOM MyRegisterClass(HINSTANCE);
LRESULT CALLBACK WinProc(HWND, UINT, WPARAM, LPARAM);
//the window event callback function
LRESULT CALLBACK WinProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
PAINTSTRUCT ps;
HDC hdc;
char *szHello = "SetPixel";
RECT rt;
int x=0, y=0, n=0;
COLORREF c;
int j;
switch (message)
{
case WM_PAINT:
//get the dimensions of the window
GetClientRect(hWnd, &rt);
//start drawing on devicce context
hdc = BeginPaint (hWnd, &ps);
//draw some text
DrawText(hdc, szHello, strlen(szHello), &rt, DT_CENTER);
j = (rand()*100);
c = RGB(0, 0, 0);
while( x<25000)
{
SetPixel(hdc, rand()%400, rand()%400, rand()%255);
x++;
}
//stop drawing
EndPaint(hWnd, &ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
}
return DefWindowProc(hWnd, message, wParam, lParam);
}
//helper function to set up the window properties
ATOM MyRegisterClass(HINSTANCE hInstance)
{
//create the window class structure
WNDCLASSEX wc;
wc.cbSize = sizeof(WNDCLASSEX);
//fill the struct with info
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = (WNDPROC)WinProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = NULL;
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
wc.lpszMenuName = NULL;
wc.lpszClassName = APPTITLE;
wc.hIconSm = NULL;
//set up the window with the class info
return RegisterClassEx(&wc);
}
//helper function to create the window and refresh it
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;
//create a new window
hWnd = CreateWindow(
APPTITLE, //window class
APPTITLE, //title bar
WS_OVERLAPPEDWINDOW, //window style
CW_USEDEFAULT, //x position of window
CW_USEDEFAULT, //y position of window
400, //width of the window
400, //height of the window
NULL, //parent window
NULL, //menu
hInstance, //application instance
NULL); //window parameters
//was there an error creating the window?
if(!hWnd)
return FALSE;
//display the window
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
//entry point for a Windows program
int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
//declare variables
MSG msg;
//register the class
MyRegisterClass(hInstance);
//initialize application
if(!InitInstance (hInstance, nCmdShow))
return FALSE;
//set random number seed
srand(time(NULL));
//main message loop
while(GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}

Answer 2

you can switch to "graphich mode" means to windows forms application mode using project setting. but you'll have to change the main function to winMain
PROJECT SETTINGS >
LINKER > SYSTEM > SUBSYSTEM > Windows (/SUBSYSTEM:WINDOWS)
C/C++ > PREPROCESSOR > PREPROCESSOR DEFINITIONS >
WIN32;_DEBUG;_WINDOWS;%(PreprocessorDefinitions)
and this is how your function in this case should look:
int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE, LPWSTR lpCmdLine, int nCmdShow)
{
///....
}