Grabby/Grabby.c

// Grabby.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "Bitmap.h"
#include "Overlay.h"
#include "Grabby.h"

/**
 * Print an error with a given context before bailing out
 */
void Die(LPTSTR lpContextMsg)
{
	LPCTSTR lpszFmt = "%s: %s";
	int iFullLen;
	LPTSTR lpszError = NULL,
		lpszFullMsg = NULL;

	// The whole point of this is to print an actual message, so get the
	// actual message
	if (!FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
			FORMAT_MESSAGE_FROM_SYSTEM |
			FORMAT_MESSAGE_IGNORE_INSERTS,
			NULL,
			GetLastError(),
			0,
			(LPTSTR) &lpszError,
			0,
			NULL))
	{
		if (lpszError != NULL) LocalFree(lpszError);
		lpszError = _T("unknown error");
	}

	iFullLen = _sctprintf(lpszFmt, lpContextMsg, lpszError);
	lpszFullMsg = (LPTSTR) LocalAlloc(LPTR, sizeof(TCHAR) * (iFullLen + 1));

	if (lpszFullMsg == NULL) {
		// I'm honestly gonna guess if we get here, we're out of memory.
		// So let's print what we have and bail
		MessageBox(NULL,
			lpContextMsg,
			_T("Catastrophic Error"),
			MB_OK | MB_ICONERROR);
	} else {
		_sntprintf(lpszFullMsg, iFullLen, lpszFmt, lpContextMsg, lpszError);
		MessageBox(NULL,
			lpszFullMsg,
			_T("Fatal Error"),
			MB_OK | MB_ICONERROR);
	}

	// TODO: should we still be nice and free memory here?
	ExitProcess(1);
}

int APIENTRY _tWinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPTSTR    lpCmdLine,
                     int       nCmdShow)
{
	SYSTEMTIME stNow = {0};
	RECT capRegion = {0};
	Screen *scrn = CreateScreen();
#define OUTPUT_DIR_LEN		96
	TCHAR szOutputDir[OUTPUT_DIR_LEN + 1];
#define FULL_OUT_PATH_LEN	OUTPUT_DIR_LEN + 24
	TCHAR szFullOutPath[FULL_OUT_PATH_LEN + 1];
	HRESULT hRes;

	if (!scrn) {
		Die("Couldn't get screen information");
	}

	switch (CreateOverlay(hInstance, scrn)) {
	case -1:
		Die("Couldn't create overlay window");
		break;
	case 0:
		/* Do nothing */
		break;
	case 1:
		// User requested we cancel out, so do that
		return 0;
	}

	GetChosenRect(&capRegion);

	if (!GetTempPath(OUTPUT_DIR_LEN, szOutputDir)) {
		Die("Couldn't get temporary directory");
	}

	GetLocalTime(&stNow);

	hRes = StringCchPrintf(szFullOutPath,
		FULL_OUT_PATH_LEN,
		"%s\\scrn_%04d%02d%02d_%02d%02d%02d.bmp",
		szOutputDir,
		stNow.wYear,
		stNow.wMonth,
		stNow.wDay,
		stNow.wHour,
		stNow.wMinute,
		stNow.wSecond);

	if (FAILED(hRes)) {
		Die("Couldn't create screenshot file path");
	}

	if (WriteRegionToFile(scrn, &capRegion, szFullOutPath) == -1) {
		Die("Couldn't grab region of the screen");
	}

	MessageBox(NULL,
		_T("Successfully grabbed a part of the screen!"),
		_T("\\o/"),
		MB_OK | MB_ICONINFORMATION);

	return 0;
}