Generate a background and set is as Windows wallpaper

stripes.cpp

// stripes.cpp : Defines the entry point for the console application.
//
//
// Magick++ demo to generate a simple text button
//
// Copyright Bob Friesenhahn, 1999, 2000, 2001, 2003
// 
#define _CRT_SECURE_NO_WARNINGS
#include <Magick++.h>
#include <string>
#include <cstdlib>
#include <sstream>
#include <iostream>

#include <random>


#include "wtypes.h"
#include "windows.h"
#include "wininet.h"
#include "shlobj.h"



#include <sys/stat.h>

using namespace std;

using namespace Magick;

void  SetWallpaper(const char*);
void GetDesktopResolution(int&, int&);

bool exists (const std::string& name);
bool exists (const char* name);

int main( int argc, char ** argv)
{

  // Initialize ImageMagick install location for Windows
  InitializeMagick(*argv);

  const char * image_name = "button_out.gif";
  
  try {
	int width, height;

	GetDesktopResolution(width, height);

    Image image;
	image.size(Geometry(width,height));
	//Random numbers
	typedef std::mt19937 rng_type;
    std::uniform_int_distribution<rng_type::result_type> colordist(0, 255);
    std::uniform_int_distribution<rng_type::result_type> stripewidth(5, 20);

    rng_type::result_type const seedval = (int)time (NULL); // get this from somewhere

	rng_type hue_r;
	rng_type stripe_width;
    hue_r.seed(seedval);
    stripe_width.seed(seedval+rand());

	bool blackSeparators = colordist(hue_r)%2 ||true;

	//Start with random hue
	float hue = (int)colordist(hue_r);

	// Set draw options
	//tak to te vudu muset sploknout...
	//image.strokeColor("red");
	Color c;
	int lasti = 0;
	int itr = 0;
	for(int i=stripewidth(stripe_width); ; i+=stripewidth(stripe_width)) {
		if(blackSeparators && itr%2==1) {
			c = Color("#000000");
		}
		else {
	    	stringstream s;
	    	s<<"hsl("<<(((int)hue) % 255)<<", 240,  100)";
	    	//Rotate the hue by golden angle (137.5/360)*255
	    	hue += 97.39583;
	    
	    	//s<<"hsl(59, 255,  "<<((int)rand() % 2)*130<<")";
	    	c = Color(s.str().c_str());
		}
		image.fillColor(Color(c));
		image.draw( DrawableRectangle(lasti,0, i,height) );
		if(i>width)
			break;

		lasti = i;
		itr++;
	}

	//image.fillColor(Color("green"));

	//image.strokeWidth(0);

	//image.draw( DrawableRectangle(200,200, 270,170) );
	bool written = false;
	try {
      image.write(image_name);
	  written = true;
	}
    catch( exception &error_ )
    {
      cout << "Image::write exception: " << error_.what() << endl;
	  system("Pause");
      return 1;
    }
	if(written) {
    	if(!exists(image_name)) {
           wcout << "The file "<<image_name<<" does not exist!" << endl;  
    	}
    	else {
  	       SetWallpaper(image_name);
  	    }

	}
	  //SystemParametersInfo( SPI_SETDESKWALLPAPER, 0, (PVOID)"button_out.gif", SPIF_UPDATEINIFILE );

	image.display();

    // Display on screen
    // button.display();
	

  }
  catch( exception &error_ )
    {
      cout << "Caught exception: " << error_.what() << endl;
	  system("Pause");
      return 1;
    }
  /*
  */
  system("Pause");
  return 0;
}

bool exists (const std::string& name) {
  struct stat buffer;   
  return (stat (name.c_str(), &buffer) == 0); 
}
bool exists(const char* name) {
  struct stat buffer;   
  return (stat (name, &buffer) == 0); 
}

// Get the horizontal and vertical screen sizes in pixel
void GetDesktopResolution(int& horizontal, int& vertical)
{
   RECT desktop;
   // Get a handle to the desktop window
   const HWND hDesktop = GetDesktopWindow();
   // Get the size of screen to the variable desktop
   GetWindowRect(hDesktop, &desktop);
   // The top left corner will have coordinates (0,0)
   // and the bottom right corner will have coordinates
   // (horizontal, vertical)
   horizontal = desktop.right;
   vertical = desktop.bottom;
}

void  SetWallpaper(const char* file){
	wchar_t widename[MAX_PATH+1], widepath[MAX_PATH+1];
	mbstowcs(widename, file, sizeof(widename) / sizeof(wchar_t));

	GetFullPathName(widename, MAX_PATH+1,widepath, NULL);


    CoInitializeEx(0,COINIT_APARTMENTTHREADED);
    IActiveDesktop* desktop;
    HRESULT status = CoCreateInstance(CLSID_ActiveDesktop,NULL,CLSCTX_INPROC_SERVER,IID_IActiveDesktop,(void**)&desktop);
    WALLPAPEROPT wOption;
    ZeroMemory(&wOption, sizeof(WALLPAPEROPT));
    wOption.dwSize=sizeof(WALLPAPEROPT);
    wOption.dwStyle = WPSTYLE_CENTER;
    status = desktop->SetWallpaper(widepath,0);
    //wcout <<"0x"<<hex<< (unsigned int)status << endl;
    status = desktop->SetWallpaperOptions(&wOption,0);
    //wcout <<"0x"<<hex<< (unsigned int) status << endl;
    status = desktop->ApplyChanges(AD_APPLY_ALL);
    //wcout <<"0x"<<hex<< (unsigned int) status << endl;
    if(status==0x80070002) {
      wcout <<"Not found: "<<widepath<< endl;
	}
	else if (status!=0) {
      wcout <<"Error: "<<widepath<< endl;
	}

    desktop->Release();
    CoUninitialize();
}