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boxcutter.cpp
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boxcutter.cpp
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/*=============================================================================
boxcutter
Copyright Matt Rasmussen 2008-2011
A simple command line-driven screenshot program
=============================================================================*/
// this definition is needed for AttachConsole
#define _WIN32_WINNT 0x0501
// c includes
#include <stdio.h>
#include <string.h>
#include <wchar.h>
#include <iostream>
#include <fstream>
// windows includes
#include <windows.h>
#include <wincon.h>
#include <commctrl.h>
#include <winuser.h>
#include <io.h>
#include <conio.h>
#include <fcntl.h>
#include "bmp.cpp"
#include "png.cpp"
// Visual C++ lacks POSIX strcasecmp function
#ifdef _MSC_VER
# define strcasecmp _stricmp
#endif
#define BOX_VERSION "1.6a"
// constants
const char* g_usage = "\n\
usage: boxcutter [OPTIONS] [OUTPUT_FILENAME]\n\
Saves a screenshot to 'OUTPUT_FILENAME' if given. Only output formats\n\
'*.bmp' and '*.png' are supported. If no file name is given,\n\
screenshot is stored on clipboard by default.\n\
\n\
OPTIONS\n\
-c, --coords X1,Y1,X2,Y2 capture the rectange (X1,Y1)-(X2,Y2)\n\
-f, --fullscreen capture the full screen\n\
-v, --version display version information\n\
-h, --help display help message\n\
";
const char* g_version = "\n\
boxcutter %s\n\
Copyright Matt Rasmussen 2008-2011\n\
";
const char *g_class_name = "BoxCutter";
// globals
class BoxCutterWindow;
BoxCutterWindow *g_win = NULL;
//=============================================================================
// functions
// Using swaps, ensure that x2 >= x, y2 >= y for capturing a rectangle of the
// screen.
void normalize_coords(int *x, int *y, int *x2, int *y2)
{
if (*x > *x2) {
int tmp = *x;
*x = *x2;
*x2 = tmp;
}
if (*y > *y2) {
int tmp = *y;
*y = *y2;
*y2 = tmp;
}
}
void get_screen_rect(RECT *rect)
{
//GetWindowRect(GetDesktopWindow(), rect);
rect->left = GetSystemMetrics(SM_XVIRTUALSCREEN);
rect->top = GetSystemMetrics(SM_YVIRTUALSCREEN);
rect->right = GetSystemMetrics(SM_CXVIRTUALSCREEN) + rect->left;
rect->bottom = GetSystemMetrics(SM_CYVIRTUALSCREEN) + rect->top;
}
// Captures a screenshot from a region of the screen
// saves it to a file
bool capture_screen(const char *filename, int x, int y, int x2, int y2)
{
// normalize coordinates
normalize_coords(&x, &y, &x2, &y2);
int w = x2 - x;
int h = y2 - y;
// copy screen to bitmap
HDC screen_dc = GetDC(0);
HDC shot_dc = CreateCompatibleDC(screen_dc);
HBITMAP shot_bitmap = CreateCompatibleBitmap(screen_dc, w, h);
HGDIOBJ old_obj = SelectObject(shot_dc, shot_bitmap);
if (!BitBlt(shot_dc, 0, 0, w, h, screen_dc, x, y, SRCCOPY)) {
printf("error: BitBlt failed\n");
return false;
}
// save bitmap to file
bool ret = false;
int len = strlen(filename);
if (len > 4 && strcasecmp(filename + len - 4, ".png") == 0) {
ret = save_png_file(shot_bitmap, shot_dc, filename);
} else if (len > 4 && strcasecmp(filename + len - 4, ".bmp") == 0) {
ret = save_bitmap_file(shot_bitmap, shot_dc, filename);
} else {
printf("error: unknown output file format\n");
ret = false;
}
DeleteDC(shot_dc);
DeleteDC(screen_dc);
SelectObject(shot_dc, old_obj);
return ret;
}
// Captures a screenshot from a region of the screen
// saves it to the clipboard
bool capture_screen_clipboard(HWND hwnd, int x, int y, int x2, int y2)
{
// normalize coordinates
normalize_coords(&x, &y, &x2, &y2);
int w = x2 - x;
int h = y2 - y;
// copy screen to bitmap
HDC screen_dc = GetDC(0);
HDC shot_dc = CreateCompatibleDC(screen_dc);
HBITMAP shot_bitmap = CreateCompatibleBitmap(screen_dc, w, h);
HGDIOBJ old_obj = SelectObject(shot_dc, shot_bitmap);
if (!BitBlt(shot_dc, 0, 0, w, h, screen_dc, x, y, SRCCOPY)) {
printf("error: BitBlt failed\n");
return false;
}
// save bitmap to clipboard
bool ret = false;
if (OpenClipboard(hwnd)) {
if (EmptyClipboard()) {
if (SetClipboardData(CF_BITMAP, shot_bitmap))
ret = true;
}
CloseClipboard();
} else {
printf("error: could not open clipboard\n");
}
// clean up
DeleteDC(shot_dc);
DeleteDC(screen_dc);
SelectObject(shot_dc, old_obj);
return ret;
}
//=============================================================================
// Window class for manual screenshot
class BoxCutterWindow
{
public:
BoxCutterWindow(HINSTANCE hinst,
const char *title, const char* filename) :
m_active(true),
m_drag(false),
m_draw(false),
m_filename(filename),
m_have_coords(false)
{
// fill wndclass structure
WNDCLASS wc;
strcpy(m_class_name, g_class_name);
wc.hInstance = hinst;
wc.lpszClassName = m_class_name;
wc.lpszMenuName = "";
wc.lpfnWndProc = WindowProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.hbrBackground = 0; //(HBRUSH) GetStockObject(WHITE_BRUSH);
wc.hCursor = LoadCursor(0, IDC_CROSS);
wc.hIcon = LoadIcon(0, IDI_APPLICATION);
// register class
ATOM class_atom = RegisterClass(&wc);
// determine screen dimensions
RECT rect;
get_screen_rect(&rect);
// create window
DWORD exstyle = WS_EX_TRANSPARENT;
DWORD style = WS_POPUP;
// set this window as the receiver of messages
g_win = this;
m_handle = CreateWindowEx(exstyle,
m_class_name,
title,
style,
// dimensions
rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top,
0, // no parent
0, // no menu
hinst, //module_instance,
NULL);
}
~BoxCutterWindow()
{
}
//===============================
// functions to manipulate window
void show(bool enabled=true)
{
if (enabled)
ShowWindow(m_handle, SW_SHOW);
else
ShowWindow(m_handle, SW_HIDE);
}
void maximize()
{
ShowWindow(m_handle, SW_SHOWMAXIMIZED);
//UpdateWindow(m_handle);
}
void activate()
{
SetForegroundWindow(m_handle);
//SwitchToThisWindow(self._handle, False)
}
void close()
{
DestroyWindow(m_handle);
}
//=============================
// accessors
bool active()
{
return m_active;
}
HWND get_handle()
{
return m_handle;
}
void get_coords(int *x1, int *y1, int *x2, int *y2)
{
*x1 = m_start.x;
*y1 = m_start.y;
*x2 = m_end.x;
*y2 = m_end.y;
}
bool have_coords()
{
return m_have_coords;
}
//=======================================
// event callbacks
static LRESULT CALLBACK WindowProc(HWND hwnd,
UINT uMsg,
WPARAM wParam,
LPARAM lParam)
{
// if window is present
if (g_win) {
// route message
switch (uMsg) {
case WM_DESTROY:
g_win->close();
PostQuitMessage(0);
return 0;
case WM_MOUSEMOVE:
g_win->on_mouse_move();
return 0;
case WM_LBUTTONDOWN:
g_win->on_mouse_down();
return 0;
case WM_LBUTTONUP:
g_win->on_mouse_up();
return 0;
}
}
// perform default action
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
// mouse button down callback
void on_mouse_down()
{
// start draging
m_drag = true;
GetCursorPos(&m_start);
}
// mouse button up callback
void on_mouse_up()
{
// if drawing has occurred, clean it up
if (m_draw) {
// cleanup rectangle on desktop
m_drag = false;
m_draw = false;
HDC hdc = CreateDC("DISPLAY", NULL, NULL, NULL);
SetROP2(hdc, R2_NOTXORPEN);
Rectangle(hdc, m_start.x, m_start.y, m_end.x, m_end.y);
DeleteDC(hdc);
m_have_coords = true;
}
// stop BoxCutter window
m_active = false;
}
// callback for mouse movement
void on_mouse_move()
{
// get current mouse coordinates
POINT pos;
GetCursorPos(&pos);
// if mouse is down, process drag
if (m_drag) {
HDC hdc = CreateDC("DISPLAY", NULL, NULL, NULL);
SetROP2(hdc, R2_NOTXORPEN);
// erase old rectangle
if (m_draw) {
Rectangle(hdc, m_start.x, m_start.y, m_end.x, m_end.y);
}
// draw new rectangle
m_draw = true;
Rectangle(hdc, m_start.x, m_start.y, pos.x, pos.y);
m_end = pos;
DeleteDC(hdc);
}
}
private:
char m_class_name[101];
HWND m_handle;
bool m_active;
bool m_drag;
bool m_draw;
const char *m_filename;
POINT m_start, m_end;
bool m_have_coords;
};
//=============================================================================
// Display usage information
void usage()
{
printf(g_usage);
}
// Display version information
void version()
{
printf(g_version, BOX_VERSION);
}
// Pump the message queue for this process.
int main_loop(BoxCutterWindow* win)
{
int ret;
MSG msg; // message structure
while ((ret = GetMessage(&msg, 0, 0, 0)) != 0 && win->active())
{
if (ret == -1) {
// error occurred
break;
}
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
// Setup the console for output (e.g. using printf)
bool setup_console()
{
int hConHandle;
long lStdHandle;
CONSOLE_SCREEN_BUFFER_INFO coninfo;
FILE *fp;
// create a console
if (!AttachConsole(ATTACH_PARENT_PROCESS)) {
// if no parent console then give up
return false;
}
const unsigned int MAX_CONSOLE_LINES = 500;
// set the screen buffer to be big enough to let us scroll text
GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &coninfo);
coninfo.dwSize.Y = MAX_CONSOLE_LINES;
SetConsoleScreenBufferSize(GetStdHandle(STD_OUTPUT_HANDLE), coninfo.dwSize);
// redirect unbuffered STDOUT to the console
lStdHandle = (long)GetStdHandle(STD_OUTPUT_HANDLE);
hConHandle = _open_osfhandle(lStdHandle, _O_TEXT);
fp = _fdopen(hConHandle, "w");
if (!fp) {
// could not open stdout
return false;
}
*stdout = *fp;
setvbuf(stdout, NULL, _IONBF, 0);
// redirect unbuffered STDIN to the console
lStdHandle = (long)GetStdHandle(STD_INPUT_HANDLE);
hConHandle = _open_osfhandle(lStdHandle, _O_TEXT);
fp = _fdopen(hConHandle, "r");
if (!fp) {
// could not open stdin
return false;
}
*stdin = *fp;
setvbuf(stdin, NULL, _IONBF, 0);
// redirect unbuffered STDERR to the console
lStdHandle = (long)GetStdHandle(STD_ERROR_HANDLE);
hConHandle = _open_osfhandle(lStdHandle, _O_TEXT);
fp = _fdopen(hConHandle, "w");
if (!fp) {
// could not open stderr
return false;
}
*stderr = *fp;
setvbuf(stderr, NULL, _IONBF, 0);
// make cout, wcout, cin, wcin, wcerr, cerr, wclog and clog
// point to console as well
std::ios::sync_with_stdio();
return true;
}
//=============================================================================
// main function
int main(int argc, char **argv)
{
HINSTANCE hInstance = (HINSTANCE)GetModuleHandle(NULL);
InitCommonControls();
setup_console();
// default screenshot filename
char *filename = NULL;
// coordinates
bool use_coords = false;
int x1, y1, x2, y2;
// parse command line
int i;
// parse options
for (i=1; i<argc; i++) {
if (argv[i][0] != '-')
// argument is not an option
break;
else if (strcmp(argv[i], "-f") == 0 ||
strcmp(argv[i], "--fullscreen") == 0)
{
RECT rect;
get_screen_rect(&rect);
x1 = rect.left;
y1 = rect.top;
x2 = rect.right;
y2 = rect.bottom;
use_coords = true;
}
else if (strcmp(argv[i], "-c") == 0 ||
strcmp(argv[i], "--coords") == 0)
{
if (i+1 >= argc) {
printf("error: expected argument for -c,--coord\n");
usage();
return 1;
}
if (sscanf(argv[++i], "%d,%d,%d,%d", &x1, &y1, &x2, &y2) != 4) {
printf("error: expected 4 comma separated integers\n");
usage();
return 1;
}
use_coords = true;
}
else if (strcmp(argv[i], "-v") == 0 ||
strcmp(argv[i], "--version") == 0)
{
// display version information
version();
return 1;
}
else if (strcmp(argv[i], "-h") == 0 ||
strcmp(argv[i], "--help") == 0)
{
// display help info
usage();
return 1;
}
else {
printf("error: unknown option '%s'\n", argv[i]);
usage();
return 1;
}
}
// argument after options is a filename
if (i < argc)
filename = argv[i];
// create screenshot window
BoxCutterWindow win(hInstance, "BoxCutter", filename);
if (use_coords) {
win.show();
} else {
// manually acquire coordinates
win.show();
win.activate();
main_loop(&win);
if (win.have_coords()) {
win.get_coords(&x1, &y1, &x2, &y2);
} else {
printf("error: cannot retrieve screenshot coordinates\n");
return 1;
}
}
// display screenshot coords
printf("screenshot coords: (%d,%d)-(%d,%d)\n", x1, y1, x2, y2);
// save bitmap
if (filename) {
// save to file
if (!capture_screen(filename, x1, y1, x2, y2))
{
MessageBox(win.get_handle(), "Cannot save screenshot",
"Error", MB_OK);
return 1;
}
printf("screenshot saved to file: %s\n", filename);
} else {
// save to clipboard
if (!capture_screen_clipboard(win.get_handle(), x1, y1, x2, y2))
{
MessageBox(win.get_handle(), "Cannot save screenshot to clipboard",
"Error", MB_OK);
return 1;
}
printf("screenshot saved to clipboard.\n");
}
win.close();
return 0;
}