This is a simple application that will explain how to host or embed an .exe application into a dialog. The same application is available in C# here. But if we want to do this in Visual C++ 6.0, it is something different. I have searched for this on different sites and did not get it in Visual C++ 6.0, so I decided to do it myself.
The basic procedure for this is:
- Declare the two required variables
- Start the application using 'CreateProcess'
- Write a call-back function to get the
HWND of the process window
- Set the parent of the .exe application
- Set the position of the window
This program is an MFC Dialog-based application. The steps are outlined below:
Step 1: Declare two variables
You must first declare the following variables:
Step 2: Start the application using 'CreateProcess'
Here is the function that will do this task and return the handle of the process:
HANDLE StartNewProcess(LPCTSTR program, LPCTSTR args)
HANDLE hProcess = NULL;
startupInfo.cb = sizeof(startupInfo);
NULL, NULL, FALSE, 0, NULL, NULL, &startupInfo,
Sleep(5000); ::EnumWindows(&EnumWindowsProc, processInfo.dwThreadId);
hProcess = processInfo.hProcess;
return hProcess; }
Here we are starting the process using
WaitForInputIdle function enables a thread to suspend its execution until the specified process has finished its initialization. The
EnumWindows function enumerates all top-level windows on the screen by passing the handle to each window and, in turn, to an application-defined callback function.
EnumWindows continues until the last top-level window is enumerated or the callback function returns
Our callback function will get the HWND of new the process window. The returned handle
hprocess can then be used to terminate the process:
Step 3: Write a call-back function to get the HWND of the process window
This step is needed to find the HWND of our .exe application's window. We can use this window handle in different functions such as SetParent, MoveWindow, etc.
int CALLBACK EnumWindowsProc(HWND hwnd, LPARAM param)
DWORD TpID = GetWindowThreadProcessId(hwnd, &pID);
if (TpID == (DWORD)param)
GetWindowThreadProcessId function retrieves the identifier of the thread that created the specified window.
apphwnd is the window handle of the newly created window.
Step 4: Set the parent of the .exe application
Here we are setting the parent window of the .exe application's window. The parent should be our application.
If we need to, we can remove the title bar of the window by using the following:
::SetWindowLong(apphwnd, GWL_STYLE, WS_VISIBLE);
Step 5: Set the position of the window
This can be done with the code below:
::MoveWindow(apphwnd, rect.left, rect.top,rect.right, rect.bottom, true);
GetClientRect will get the window size of our dialog.
MoveWindow will position the .exe appplication's window inside our dialog.
Note that after calling
StartNewProcess we should only do Steps 4 and 5, and these should be inside a function handler of our dialog-based program.
- May 9, 2007 - Original version posted