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Uninstall program that can remove itself

Posted on 2004-11-16
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How can I make it so that my uninstall program can remove itself after it's done with all the other files?
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Question by:CornDog932
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jkr earned 2000 total points
ID: 12594726
Jeffrey Richter demonstrated that in http://www.microsoft.com/msj/0198/win320198.aspx ("Win32 Q & A -- MSJ, January 1998"). The trick is to spawn a copy of your own process that is created with 'FILE_FLAG_DELTE_ON_CLOSE' to wipe out the original executable:

 Module name: DeleteMe.cpp
 Written by: Jeffrey Richter
 Description: Allows an EXEcutable file to delete itself
 ********************************************************************/
 
 #include <Windows.h>
 #include <stdlib.h>
 #include <tchar.h>
 
 /////////////////////////////////////////////////////////////////////
 
 int WINAPI WinMain(HINSTANCE h, HINSTANCE h2, LPSTR psz, int n) {
 
    // Is this the original EXE or the clone EXE?
    // If the command-line 1  argument, this is the original EXE
    // If the command-line >1 argument, this is the clone EXE
    if (__argc == 1) {
 
       // Original EXE: Spawn clone EXE to delete this EXE
 
       // Copy this EXEcutable image into the user's temp directory
       TCHAR szPathOrig[_MAX_PATH], szPathClone[_MAX_PATH];
       GetModuleFileName(NULL, szPathOrig, _MAX_PATH);
       GetTempPath(_MAX_PATH, szPathClone);
       GetTempFileName(szPathClone, __TEXT("Del"), 0, szPathClone);
       CopyFile(szPathOrig, szPathClone, FALSE);
 
       // Open the clone EXE using FILE_FLAG_DELETE_ON_CLOSE
       HANDLE hfile = CreateFile(szPathClone, 0, FILE_SHARE_READ, NULL,                               
      OPEN_EXISTING, FILE_FLAG_DELETE_ON_CLOSE, NULL);
 
       // Spawn the clone EXE passing it our EXE's process handle
       // and the full path name to the original EXE file.
       TCHAR szCmdLine[512];
       HANDLE hProcessOrig = OpenProcess(SYNCHRONIZE, TRUE,                                               
      GetCurrentProcessId());
       wsprintf(szCmdLine, __TEXT("%s %d \"%s\""), szPathClone, hProcessOrig,                     
      szPathOrig);
       STARTUPINFO si;
       ZeroMemory(&si, sizeof(si));
       si.cb = sizeof(si);
       PROCESS_INFORMATION pi;
       CreateProcess(NULL, szCmdLine, NULL, NULL, TRUE, 0, NULL, NULL, &si, &pi);
       CloseHandle(hProcessOrig);
       CloseHandle(hfile);
 
       // This original process can now terminate.
       } else {
 
       // Clone EXE: When original EXE terminates, delete it
       HANDLE hProcessOrig = (HANDLE) _ttoi(__targv[1]);
       WaitForSingleObject(hProcessOrig, INFINITE);
       CloseHandle(hProcessOrig);
       DeleteFile(__targv[2]);
       // Insert code here to remove the subdirectory too (if desired).
 
       // The system will delete the clone EXE automatically
       // because it was opened with FILE_FLAG_DELETE_ON_CLOSE
    }
    return(0);
 }
 
(http://www.microsoft.com/msj/0198/win32textfigs.htm#fig1)
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Expert Comment

by:jkr
ID: 12595115
BTW, another method would be to

MoveFileEx("myapp.exe", NULL, MOVEFILE_DELAY_UNTIL_REBOOT);

This would schedule your file to be deleted when the machine reboots the next time.
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by:CornDog932
ID: 12595641
Thank you for the great solutions
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