Window manipulation using window-handle from different process on MS Windows(XP) - winapi

Question

Is it possible to do some operations with a window from other process having it's handle? What I would like to do is:
-remove window decoration
-move window to any position of the screen
-let window stay on top without making it modal
A link to a command line tool, script or C/C++ code snippet be great.
Thank you very much!

Answer 1

I decided to take another shot, so I experimented with your code and added what was missing: a -naked option.
The key to remove the decoration came from here. Though it works, you will eventually find out that the application who got naked might start displaying a few bugs after it.
Enjoy:
#include "windows.h"
#include <iostream>
#include <string>
#include <sstream>
#include <algorithm>
#include <limits>
using namespace std;
#ifdef min
#undef min
#endif
int main(int argc, char* argv[])
{
char** param = argv;
unsigned int x = numeric_limits<int>::min(), y=numeric_limits<int>::min(), w=numeric_limits<int>::min(), h=numeric_limits<int>::min();
HWND z = HWND_NOTOPMOST;
unsigned int flags = (SWP_SHOWWINDOW | SWP_NOSIZE | SWP_NOMOVE | SWP_NOZORDER);
++param;
wstring winTitle;
bool close = false;
bool naked = false;
while (*param)
{
string sparam(*param);
if (sparam == "-title")
{
++param;
if (!*param) break;
sparam = *param;
winTitle.resize(sparam.size());
copy(sparam.begin(), sparam.end(), winTitle.begin());
}
else if (sparam == "-move")
{
++param;
if (!*param) break;
sparam =*param;
stringstream sstr(sparam);
char sep;
sstr >> x >>sep >> y;
if (x != numeric_limits<int>::min() && y != numeric_limits<int>::min())
{
flags &= ~SWP_NOMOVE;
}
}
else if (sparam == "-resize")
{
++param;
if (!*param) break;
sparam = *param;
stringstream sstr(sparam);
char sep;
sstr >> w >>sep >> h;
if (h != numeric_limits<int>::min() && w != numeric_limits<int>::min() )
{
flags &= ~SWP_NOSIZE;
}
}
else if (sparam == "-top")
{
z = HWND_TOP;
flags &= ~SWP_NOZORDER;
}
else if (sparam == "-staytop")
{
z = HWND_TOPMOST;
flags &= ~SWP_NOZORDER;
}
else if (sparam == "-bottom")
{
z = HWND_BOTTOM;
flags &= ~SWP_NOZORDER;
}
else if (sparam == "-hide")
{
flags |= SWP_HIDEWINDOW;
}
else if (sparam == "-close")
{
close = true;
}
else if (sparam == "-naked")
{
naked = true;
}
++param;
}
if (winTitle.empty())
{
return -1;
}
HWND win_handle = FindWindow(0, winTitle.c_str());
if (win_handle != 0)
{
if (close)
{
TerminateProcess( (HANDLE )GetProcessId( win_handle ), 0);
return 0;
}
SetWindowPos( win_handle, z, x, y, w, h, flags );
if (naked)
{
SetWindowLong(win_handle, GWL_STYLE, GetWindowLong(win_handle, GWL_EXSTYLE) | WS_EX_TOPMOST);
ShowWindow(win_handle, SW_SHOW);
}
}
else
{
cout << "!!! FindWindow failed" << endl;
}
return 0;
}

Answer 2

Remove window decoration is a bit tricky. I guess you will probably have to set up a bounty for your question.
Check the Windows API to see what functions you should be calling.
Anyway, this snippet should get you started:
HWND win_handle = FindWindow (0, "Title Of The Window");
if (win_handle != 0)
{
/* Do your magic */
// MoveWindow params: handle, x=100, y=200, width=400, height=450, repaint
MoveWindow(win_handle, 100, 200, 400, 450, TRUE);
}
else
{
std::cout << "!!! FindWindow failed" << std::endl;
}

Answer 3

Finally, with the help of karlphillip I was able to write a tool that moves, resizes and sticks a window on top. What I am missing is how to remove decoration and close. Here is the code:
#include "windows.h"
#include <iostream>
#include <string>
#include <sstream>
#include <algorithm>
#include <limits>
using namespace std;
#ifdef min
#undef min
#endif
int main(int argc, char* argv[])
{
char **param= argv;
wstring winTitle;
bool close = false;
unsigned int x=numeric_limits<int>::min(), y=numeric_limits<int>::min(), w=numeric_limits<int>::min(), h=numeric_limits<int>::min();
HWND z=HWND_NOTOPMOST;
unsigned int flags=SWP_SHOWWINDOW | SWP_NOSIZE | SWP_NOMOVE | SWP_NOZORDER;
++param;
while ( *param )
{
string sparam(*param);
if ( sparam == "-title" )
{
++param; if (!*param) break;
sparam =*param;
winTitle.resize(sparam.size());
copy (sparam.begin(), sparam.end(), winTitle.begin());
}
else if ( sparam == "-move" )
{
++param; if (!*param) break;
sparam =*param;
stringstream sstr( sparam );
char sep;
sstr >> x >>sep >> y;
if ( x != numeric_limits<int>::min() && y != numeric_limits<int>::min() )
{
flags &= ~SWP_NOMOVE;
}
}
else if ( sparam == "-resize" )
{
++param; if (!*param) break;
sparam =*param;
stringstream sstr( sparam );
char sep;
sstr >> w >>sep >> h;
if ( h != numeric_limits<int>::min() && w != numeric_limits<int>::min() )
{
flags &= ~SWP_NOSIZE;
}
}
else if ( sparam == "-top" )
{
z = HWND_TOP;
flags &= ~SWP_NOZORDER;
}
else if ( sparam == "-staytop" )
{
z = HWND_TOPMOST;
flags &= ~SWP_NOZORDER;
}
else if ( sparam == "-bottom" )
{
z = HWND_BOTTOM;
flags &= ~SWP_NOZORDER;
}
else if ( sparam == "-hide" )
{
flags |= SWP_HIDEWINDOW;
}
else if ( sparam == "-close" )
{
close=true;
}
++param;
}
if ( winTitle.empty() )
{
return 1;
}
HWND win_handle = FindWindow (0, winTitle.c_str());
if (win_handle != 0)
{
if(close)
{
TerminateProcess( (HANDLE )GetProcessId( win_handle ), 0 );
return 0;
}
SetWindowPos( win_handle, z, x, y, w, h, flags );
}
else
{
cout << "!!! FindWindow failed" << endl;
}
//system("pause");
return 0;
}