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/*
* Copyright (c) 2009, The Mozilla Foundation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the Mozilla Foundation nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY The Mozilla Foundation ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL The Mozilla Foundation BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Contributors:
* Ted Mielczarek <ted.mielczarek@gmail.com>
*/
/*
* win32-screenshot.cpp: Save a screenshot of the Windows desktop in .png
* format. If a filename is specified as the first argument on the commandline,
* then the image will be saved to that filename. Otherwise, the image will
* be saved as "screenshot.png" in the current working directory.
*/
// VS2015: Platform SDK 8.1's GdiplusTypes.h uses the min macro
#undef NOMINMAX
#undef WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <gdiplus.h>
// Link w/ subsystem windows so we don't get a console when executing
// this binary.
#ifndef __MINGW32__
# pragma comment(linker, "/SUBSYSTEM:windows /ENTRY:wmainCRTStartup")
#endif
using namespace Gdiplus;
// From http://msdn.microsoft.com/en-us/library/ms533843%28VS.85%29.aspx
static int GetEncoderClsid(const WCHAR* format, CLSID* pClsid) {
UINT num = 0; // number of image encoders
UINT size = 0; // size of the image encoder array in bytes
ImageCodecInfo* pImageCodecInfo = nullptr;
GetImageEncodersSize(&num, &size);
if (size == 0) return -1; // Failure
pImageCodecInfo = (ImageCodecInfo*)(malloc(size));
if (pImageCodecInfo == nullptr) return -1; // Failure
GetImageEncoders(num, size, pImageCodecInfo);
for (UINT j = 0; j < num; ++j) {
if (wcscmp(pImageCodecInfo[j].MimeType, format) == 0) {
*pClsid = pImageCodecInfo[j].Clsid;
free(pImageCodecInfo);
return j; // Success
}
}
free(pImageCodecInfo);
return -1; // Failure
}
#ifdef __MINGW32__
extern "C"
#endif
int
wmain(int argc, wchar_t** argv) {
GdiplusStartupInput gdiplusStartupInput;
ULONG_PTR gdiplusToken;
GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, nullptr);
HWND desktop = GetDesktopWindow();
HDC desktopdc = GetDC(desktop);
HDC mydc = CreateCompatibleDC(desktopdc);
int width = GetSystemMetrics(SM_CXSCREEN);
int height = GetSystemMetrics(SM_CYSCREEN);
HBITMAP mybmp = CreateCompatibleBitmap(desktopdc, width, height);
HBITMAP oldbmp = (HBITMAP)SelectObject(mydc, mybmp);
BitBlt(mydc, 0, 0, width, height, desktopdc, 0, 0, SRCCOPY | CAPTUREBLT);
SelectObject(mydc, oldbmp);
const wchar_t* filename = (argc > 1) ? argv[1] : L"screenshot.png";
Bitmap* b = Bitmap::FromHBITMAP(mybmp, nullptr);
CLSID encoderClsid;
Status stat = GenericError;
if (b && GetEncoderClsid(L"image/png", &encoderClsid) != -1) {
stat = b->Save(filename, &encoderClsid, nullptr);
}
if (b) delete b;
// cleanup
GdiplusShutdown(gdiplusToken);
ReleaseDC(desktop, desktopdc);
DeleteObject(mybmp);
DeleteDC(mydc);
return stat == Ok ? 0 : 1;
}
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