System

This is a discussion on System within the C++ Programming forums, part of the General Programming Boards category; I'm working on creating a program that loads and runs programs of my specification. What function could I use to ...

  1. #1
    Student drdroid's Avatar
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    Question System

    I'm working on creating a program that loads and runs programs of my specification. What function could I use to do so? What header files do I need? And finally are there any functions that will show all files and folders in a section? I'm currently running Borland V4.52 and Windows 98(But you could just look at my footer).

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    Registered User
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    One way

    of doing it is to use the system("program.exe); commmand in stdlib.h. thats the only way I know of doing it and it has been working well for me. I am sure there are other ways of doing it that may be better for optimization and what have you.
    Jeff Paddon
    Undergraduate Research Assistant
    Physics Department
    St. Francis Xavier University

  3. #3
    PC Fixer-Upper Waldo2k2's Avatar
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    just to clarify for you:
    system(const char*);
    where const char* is the DOS command you want to run. Make sure to use parenthesis:
    int main() {
    system("FIND 'hello' c:\\my documents\\whatever.txt");
    //note the singe quotes inside the doubles
    return 0;
    }
    PHP and XML
    Let's talk about SAX

  4. #4
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    you could use the ShellExecute() function from the windows.h file:

    The ShellExecute function opens or prints a specified file. The file can be an executable file or a document file. See ShellExecuteEx also.

    Code:
    HINSTANCE ShellExecute(
    
        HWND hwnd,	// handle to parent window
        LPCTSTR lpOperation,	// pointer to string that specifies operation to perform
        LPCTSTR lpFile,	// pointer to filename or folder name string
        LPCTSTR lpParameters,	// pointer to string that specifies executable-file parameters 
        LPCTSTR lpDirectory,	// pointer to string that specifies default directory
        INT nShowCmd 	// whether file is shown when opened
       );
    Parameters

    hwnd

    Specifies a parent window. This window receives any message boxes that an application produces. For example, an application may report an error by producing a message box.

    lpOperation

    Pointer to a null-terminated string that specifies the operation to perform. The following operation strings are valid:

    String Meaning
    “open” The function opens the file specified by lpFile. The file can be an executable file or a document file. The file can be a folder to open.
    “print” The function prints the file specified by lpFile. The file should be a document file. If the file is an executable file, the function opens the file, as if “open” had been specified.
    “explore” The function explores the folder specified by lpFile.
    The lpOperation parameter can be NULL. In that case, the function opens the file specified by lpFile.

    lpFile

    Pointer to a null-terminated string that specifies the file to open or print or the folder to open or explore. The function can open an executable file or a document file. The function can print a document file.

    lpParameters

    If lpFile specifies an executable file, lpParameters is a pointer to a null-terminated string that specifies parameters to be passed to the application.
    If lpFile specifies a document file, lpParameters should be NULL.

    lpDirectory

    Pointer to a null-terminated string that specifies the default directory.

    nShowCmd

    If lpFile specifies an executable file, nShowCmd specifies how the application is to be shown when it is opened. This parameter can be one of the following values:

    Value Meaning
    SW_HIDE Hides the window and activates another window.
    SW_MAXIMIZE Maximizes the specified window.
    SW_MINIMIZE Minimizes the specified window and activates the next top-level window in the Z order.
    SW_RESTORE Activates and displays the window. If the window is minimized or maximized, Windows restores it to its original size and position. An application should specify this flag when restoring a minimized window.
    SW_SHOW Activates the window and displays it in its current size and position.
    SW_SHOWDEFAULT Sets the show state based on the SW_ flag specified in the STARTUPINFO structure passed to the CreateProcess function by the program that started the application. An application should call ShowWindow with this flag to set the initial show state of its main window.
    SW_SHOWMAXIMIZED Activates the window and displays it as a maximized window.
    SW_SHOWMINIMIZED Activates the window and displays it as a minimized window.
    SW_SHOWMINNOACTIVE Displays the window as a minimized window. The active window remains active.
    SW_SHOWNA Displays the window in its current state. The active window remains active.
    SW_SHOWNOACTIVATE Displays a window in its most recent size and position. The active window remains active.
    SW_SHOWNORMAL Activates and displays a window. If the window is minimized or maximized, Windows restores it to its original size and position. An application should specify this flag when displaying the window for the first time.
    If lpFile specifies a document file, nShowCmd should be zero.

    Return Values

    If the function succeeds, the return value is the instance handle of the application that was run, or the handle of a dynamic data exchange (DDE) server application.
    If the function fails, the return value is an error value that is less than or equal to 32. The following table lists these error values:

    Value Meaning
    0 The operating system is out of memory or resources.
    ERROR_FILE_NOT_FOUND The specified file was not found.
    ERROR_PATH_NOT_FOUND The specified path was not found.
    ERROR_BAD_FORMAT The .EXE file is invalid (non-Win32 .EXE or error in .EXE image).
    SE_ERR_ACCESSDENIED The operating system denied access to the specified file.
    SE_ERR_ASSOCINCOMPLETE The filename association is incomplete or invalid.
    SE_ERR_DDEBUSY The DDE transaction could not be completed because other DDE transactions were being processed.
    SE_ERR_DDEFAIL The DDE transaction failed.
    SE_ERR_DDETIMEOUT The DDE transaction could not be completed because the request timed out.
    SE_ERR_DLLNOTFOUND The specified dynamic-link library was not found.
    SE_ERR_FNF The specified file was not found.
    SE_ERR_NOASSOC There is no application associated with the given filename extension.
    SE_ERR_OOM There was not enough memory to complete the operation.
    SE_ERR_PNF The specified path was not found.
    SE_ERR_SHARE A sharing violation occurred.
    Remarks

    The file specified by the lpFile parameter can be a document file or an executable file. If the file is a document file, the ShellExecute function opens or prints it, depending on the value of the lpOperation parameter. If the file is an executable file, the ShellExecute function opens it, even if lpOperation specifies printing.
    You can use ShellExecute to open or explore a shell folder. To open a folder, use either of the following calls:

    ShellExecute(handle, NULL, path_to_folder, NULL, NULL, SW_SHOWNORMAL);

    or


    ShellExecute(handle, "open", path_to_folder, NULL, NULL, SW_SHOWNORMAL);


    To explore a folder, use the following call:

    ShellExecute(handle, "explore", path_to_folder, NULL, NULL, SW_SHOWNORMAL);


    If lpOperation is NULL, the function opens the file specified by lpFile. If lpOperation is “open” or “explore”, the function will force an open window or explorer.

    See Also

    FindExecutable, ShellExecuteEx
    "There are three kinds of people in the world...
    Those that can count and those that can't."

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