/*
** dual.c Runs as both CONSOLE and GUI app in Windows.
**
** This solution is based on the "Momentary Flicker" solution that Robert Kennedy
** discusses in the highest-rated answer (as of Jan 2013), i.e. the one drawback
** is that the console window will briefly flash up when run as a GUI. If you
** want to avoid this, you can create a shortcut to the executable and tell the
** short cut to run minimized. That will minimize the console window (which then
** immediately quits), but not the GUI window. If you want the GUI window to
** also run minimized, you have to also put -minimized on the command line.
**
** Tested under MinGW: gcc -o dual.exe dual.c -lgdi32
**
*/
#include <windows.h>
#include <stdio.h>
static int my_win_main(HINSTANCE hInstance,int argc,char *argv[],int iCmdShow);
static LRESULT CALLBACK WndProc(HWND hwnd,UINT iMsg,WPARAM wParam,LPARAM lParam);
static int win_started_from_console(void);
static BOOL CALLBACK find_win_by_procid(HWND hwnd,LPARAM lp);
int main(int argc,char *argv[])
{
HINSTANCE hinst;
int i,gui,relaunch,minimized,started_from_console;
/*
** If not run from command-line, or if run with "-gui" option, then GUI mode
** Otherwise, CONSOLE app.
*/
started_from_console = win_started_from_console();
gui = !started_from_console;
relaunch=0;
minimized=0;
/*
** Check command options for forced GUI and/or re-launch
*/
for (i=1;i<argc;i++)
{
if (!strcmp(argv[i],"-minimized"))
minimized=1;
if (!strcmp(argv[i],"-gui"))
gui=1;
if (!strcmp(argv[i],"-gui-"))
gui=0;
if (!strcmp(argv[i],"-relaunch"))
relaunch=1;
}
if (!gui && !relaunch)
{
/* RUN AS CONSOLE APP */
printf("Console app only.\n");
printf("Usage: dual [-gui[-]] [-minimized].\n\n");
if (!started_from_console)
{
char buf[16];
printf("Press <Enter> to exit.\n");
fgets(buf,15,stdin);
}
return(0);
}
/* GUI mode */
/*
** If started from CONSOLE, but want to run in GUI mode, need to re-launch
** application to completely separate it from the console that started it.
**
** Technically, we don't have to re-launch if we are not started from
** a console to begin with, but by re-launching we can avoid the flicker of
** the console window when we start if we start from a shortcut which tells
** us to run minimized.
**
** If the user puts "-minimized" on the command-line, then there's
** no point to re-launching when double-clicked.
*/
if (!relaunch && (started_from_console || !minimized))
{
char exename[256];
char buf[512];
STARTUPINFO si;
PROCESS_INFORMATION pi;
GetStartupInfo(&si);
GetModuleFileNameA(NULL,exename,255);
sprintf(buf,"\"%s\" -relaunch",exename);
for (i=1;i<argc;i++)
{
if (strlen(argv[i])+3+strlen(buf) > 511)
break;
sprintf(&buf[strlen(buf)]," \"%s\"",argv[i]);
}
memset(&pi,0,sizeof(PROCESS_INFORMATION));
memset(&si,0,sizeof(STARTUPINFO));
si.cb = sizeof(STARTUPINFO);
si.dwX = 0; /* Ignored unless si.dwFlags |= STARTF_USEPOSITION */
si.dwY = 0;
si.dwXSize = 0; /* Ignored unless si.dwFlags |= STARTF_USESIZE */
si.dwYSize = 0;
si.dwFlags = STARTF_USESHOWWINDOW;
si.wShowWindow = SW_SHOWNORMAL;
/*
** Note that launching ourselves from a console will NOT create new console.
*/
CreateProcess(exename,buf,0,0,1,DETACHED_PROCESS,0,NULL,&si,&pi);
return(10); /* Re-launched return code */
}
/*
** GUI code starts here
*/
hinst=GetModuleHandle(NULL);
/* Free the console that we started with */
FreeConsole();
/* GUI call with functionality of WinMain */
return(my_win_main(hinst,argc,argv,minimized ? SW_MINIMIZE : SW_SHOWNORMAL));
}
static int my_win_main(HINSTANCE hInstance,int argc,char *argv[],int iCmdShow)
{
HWND hwnd;
MSG msg;
WNDCLASSEX wndclass;
static char *wintitle="GUI Window";
wndclass.cbSize = sizeof (wndclass) ;
wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance;
wndclass.hIcon = NULL;
wndclass.hCursor = NULL;
wndclass.hbrBackground = NULL;
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = wintitle;
wndclass.hIconSm = NULL;
RegisterClassEx (&wndclass) ;
hwnd = CreateWindowEx(WS_EX_OVERLAPPEDWINDOW,wintitle,0,
WS_VISIBLE|WS_OVERLAPPEDWINDOW,
100,100,400,200,NULL,NULL,hInstance,NULL);
SetWindowText(hwnd,wintitle);
ShowWindow(hwnd,iCmdShow);
while (GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return(msg.wParam);
}
static LRESULT CALLBACK WndProc (HWND hwnd,UINT iMsg,WPARAM wParam,LPARAM lParam)
{
if (iMsg==WM_DESTROY)
{
PostQuitMessage(0);
return(0);
}
return(DefWindowProc(hwnd,iMsg,wParam,lParam));
}
static int fwbp_pid;
static int fwbp_count;
static int win_started_from_console(void)
{
fwbp_pid=GetCurrentProcessId();
if (fwbp_pid==0)
return(0);
fwbp_count=0;
EnumWindows((WNDENUMPROC)find_win_by_procid,0L);
return(fwbp_count==0);
}
static BOOL CALLBACK find_win_by_procid(HWND hwnd,LPARAM lp)
{
int pid;
GetWindowThreadProcessId(hwnd,(LPDWORD)&pid);
if (pid==fwbp_pid)
fwbp_count++;
return(TRUE);
}