Windows – Terminate process by name

int KILL_PROC_BY_NAME(const char *szToTerminate)
// Created: 6/23/2000  (RK)
// Last modified: 3/10/2002  (RK)
// Please report any problems or bugs to kochhar@physiology.wisc.edu
// The latest version of this routine can be found at:
//     http://www.neurophys.wisc.edu/ravi/software/killproc/
// Terminate the process "szToTerminate" if it is currently running
// This works for Win/95/98/ME and also Win/NT/2000/XP
// The process name is case-insensitive, i.e. "notepad.exe" and "NOTEPAD.EXE"
// will both work (for szToTerminate)
// Return codes are as follows:
//   0   = Process was successfully terminated
//   603 = Process was not currently running
//   604 = No permission to terminate process
//   605 = Unable to load PSAPI.DLL
//   602 = Unable to terminate process for some other reason
//   606 = Unable to identify system type
//   607 = Unsupported OS
//   632 = Invalid process name
//   700 = Unable to get procedure address from PSAPI.DLL
//   701 = Unable to get process list, EnumProcesses failed
//   702 = Unable to load KERNEL32.DLL
//   703 = Unable to get procedure address from KERNEL32.DLL
//   704 = CreateToolhelp32Snapshot failed
// Change history:
//   modified 3/8/2002  - Borland-C compatible if BORLANDC is defined as
//                        suggested by Bob Christensen
//   modified 3/10/2002 - Removed memory leaks as suggested by
//                          Jonathan Richard-Brochu (handles to Proc and Snapshot
//                        were not getting closed properly in some cases)
{
BOOL bResult,bResultm;
DWORD aiPID[1000],iCb=1000,iNumProc,iV2000=0;
DWORD iCbneeded,i,iFound=0;
char szName[MAX_PATH],szToTermUpper[MAX_PATH];
HANDLE hProc,hSnapShot,hSnapShotm;
OSVERSIONINFO osvi;
HINSTANCE hInstLib;
int iLen,iLenP,indx;
HMODULE hMod;
PROCESSENTRY32 procentry;
MODULEENTRY32 modentry;

// Transfer Process name into "szToTermUpper" and
// convert it to upper case
iLenP=strlen(szToTerminate);
if(iLenP<1 || iLenP>MAX_PATH) return 632;
for(indx=0;indx<iLenP;indx++)
szToTermUpper[indx]=toupper(szToTerminate[indx]);
szToTermUpper[iLenP]=0;

// PSAPI Function Pointers.
BOOL (WINAPI *lpfEnumProcesses)( DWORD *, DWORD cb, DWORD * );
BOOL (WINAPI *lpfEnumProcessModules)( HANDLE, HMODULE *,
DWORD, LPDWORD );
DWORD (WINAPI *lpfGetModuleBaseName)( HANDLE, HMODULE,
LPTSTR, DWORD );

// ToolHelp Function Pointers.
HANDLE (WINAPI *lpfCreateToolhelp32Snapshot)(DWORD,DWORD) ;
BOOL (WINAPI *lpfProcess32First)(HANDLE,LPPROCESSENTRY32) ;
BOOL (WINAPI *lpfProcess32Next)(HANDLE,LPPROCESSENTRY32) ;
BOOL (WINAPI *lpfModule32First)(HANDLE,LPMODULEENTRY32) ;
BOOL (WINAPI *lpfModule32Next)(HANDLE,LPMODULEENTRY32) ;

// First check what version of Windows we're in
osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
bResult=GetVersionEx(&osvi);
if(!bResult)     // Unable to identify system version
return 606;

// At Present we only support Win/NT/2000/XP or Win/9x/ME
if((osvi.dwPlatformId != VER_PLATFORM_WIN32_NT) &&
(osvi.dwPlatformId != VER_PLATFORM_WIN32_WINDOWS))
return 607;

if(osvi.dwPlatformId==VER_PLATFORM_WIN32_NT)
{
// Win/NT or 2000 or XP

// Load library and get the procedures explicitly. We do
// this so that we don't have to worry about modules using
// this code failing to load under Windows 9x, because
// it can't resolve references to the PSAPI.DLL.
hInstLib = LoadLibraryA("PSAPI.DLL");
if(hInstLib == NULL)
return 605;

// Get procedure addresses.
lpfEnumProcesses = (BOOL(WINAPI *)(DWORD *,DWORD,DWORD*))
GetProcAddress( hInstLib, "EnumProcesses" ) ;
lpfEnumProcessModules = (BOOL(WINAPI *)(HANDLE, HMODULE *,
DWORD, LPDWORD)) GetProcAddress( hInstLib,
"EnumProcessModules" ) ;
lpfGetModuleBaseName =(DWORD (WINAPI *)(HANDLE, HMODULE,
LPTSTR, DWORD )) GetProcAddress( hInstLib,
"GetModuleBaseNameA" ) ;

if(lpfEnumProcesses == NULL ||
lpfEnumProcessModules == NULL ||
lpfGetModuleBaseName == NULL)
{
FreeLibrary(hInstLib);
return 700;
}

bResult=lpfEnumProcesses(aiPID,iCb,&iCbneeded);
if(!bResult)
{
// Unable to get process list, EnumProcesses failed
FreeLibrary(hInstLib);
return 701;
}

// How many processes are there?
iNumProc=iCbneeded/sizeof(DWORD);

// Get and match the name of each process
for(i=0;i<iNumProc;i++)
{
// Get the (module) name for this process

strcpy(szName,"Unknown");
// First, get a handle to the process
hProc=OpenProcess(PROCESS_QUERY_INFORMATION|PROCESS_VM_READ,FALSE,
aiPID[i]);
// Now, get the process name
if(hProc)
{
if(lpfEnumProcessModules(hProc,&hMod,sizeof(hMod),&iCbneeded) )
{
iLen=lpfGetModuleBaseName(hProc,hMod,szName,MAX_PATH);
}
}
CloseHandle(hProc);
// We will match regardless of lower or upper case
#ifdef BORLANDC
if(strcmp(strupr(szName),szToTermUpper)==0)
#else
if(strcmp(_strupr(szName),szToTermUpper)==0)
#endif
{
// Process found, now terminate it
iFound=1;
// First open for termination
hProc=OpenProcess(PROCESS_TERMINATE,FALSE,aiPID[i]);
if(hProc)
{
if(TerminateProcess(hProc,0))
{
// process terminated
CloseHandle(hProc);
FreeLibrary(hInstLib);
return 0;
}
else
{
// Unable to terminate process
CloseHandle(hProc);
FreeLibrary(hInstLib);
return 602;
}
}
else
{
// Unable to open process for termination
FreeLibrary(hInstLib);
return 604;
}
}
}
}

if(osvi.dwPlatformId==VER_PLATFORM_WIN32_WINDOWS)
{
// Win/95 or 98 or ME

hInstLib = LoadLibraryA("Kernel32.DLL");
if( hInstLib == NULL )
return 702;

// Get procedure addresses.
// We are linking to these functions of Kernel32
// explicitly, because otherwise a module using
// this code would fail to load under Windows NT,
// which does not have the Toolhelp32
// functions in the Kernel 32.
lpfCreateToolhelp32Snapshot=
(HANDLE(WINAPI *)(DWORD,DWORD))
GetProcAddress( hInstLib,
"CreateToolhelp32Snapshot" ) ;
lpfProcess32First=
(BOOL(WINAPI *)(HANDLE,LPPROCESSENTRY32))
GetProcAddress( hInstLib, "Process32First" ) ;
lpfProcess32Next=
(BOOL(WINAPI *)(HANDLE,LPPROCESSENTRY32))
GetProcAddress( hInstLib, "Process32Next" ) ;
lpfModule32First=
(BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32))
GetProcAddress( hInstLib, "Module32First" ) ;
lpfModule32Next=
(BOOL(WINAPI *)(HANDLE,LPMODULEENTRY32))
GetProcAddress( hInstLib, "Module32Next" ) ;
if( lpfProcess32Next == NULL ||
lpfProcess32First == NULL ||
lpfModule32Next == NULL ||
lpfModule32First == NULL ||
lpfCreateToolhelp32Snapshot == NULL )
{
FreeLibrary(hInstLib);
return 703;
}

// The Process32.. and Module32.. routines return names in all uppercase

// Get a handle to a Toolhelp snapshot of all the systems processes.

hSnapShot = lpfCreateToolhelp32Snapshot(
TH32CS_SNAPPROCESS, 0 ) ;
if( hSnapShot == INVALID_HANDLE_VALUE )
{
FreeLibrary(hInstLib);
return 704;
}

// Get the first process' information.
procentry.dwSize = sizeof(PROCESSENTRY32);
bResult=lpfProcess32First(hSnapShot,&procentry);

// While there are processes, keep looping and checking.
while(bResult)
{
// Get a handle to a Toolhelp snapshot of this process.
hSnapShotm = lpfCreateToolhelp32Snapshot(
TH32CS_SNAPMODULE, procentry.th32ProcessID) ;
if( hSnapShotm == INVALID_HANDLE_VALUE )
{
CloseHandle(hSnapShot);
FreeLibrary(hInstLib);
return 704;
}
// Get the module list for this process
modentry.dwSize=sizeof(MODULEENTRY32);
bResultm=lpfModule32First(hSnapShotm,&modentry);

// While there are modules, keep looping and checking
while(bResultm)
{
if(strcmp(modentry.szModule,szToTermUpper)==0)
{
// Process found, now terminate it
iFound=1;
// First open for termination
hProc=OpenProcess(PROCESS_TERMINATE,FALSE,procentry.th32ProcessID);
if(hProc)
{
if(TerminateProcess(hProc,0))
{
// process terminated
CloseHandle(hSnapShotm);
CloseHandle(hSnapShot);
CloseHandle(hProc);
FreeLibrary(hInstLib);
return 0;
}
else
{
// Unable to terminate process
CloseHandle(hSnapShotm);
CloseHandle(hSnapShot);
CloseHandle(hProc);
FreeLibrary(hInstLib);
return 602;
}
}
else
{
// Unable to open process for termination
CloseHandle(hSnapShotm);
CloseHandle(hSnapShot);
FreeLibrary(hInstLib);
return 604;
}
}
else
{  // Look for next modules for this process
modentry.dwSize=sizeof(MODULEENTRY32);
bResultm=lpfModule32Next(hSnapShotm,&modentry);
}
}

//Keep looking
CloseHandle(hSnapShotm);
procentry.dwSize = sizeof(PROCESSENTRY32);
bResult = lpfProcess32Next(hSnapShot,&procentry);
}
CloseHandle(hSnapShot);
}
if(iFound==0)
{
FreeLibrary(hInstLib);
return 603;
}
FreeLibrary(hInstLib);
return 0;
}