process id from exe

Hello,

Ok my problem is that I need a function to find out the process id from a given process name.

e.g.: I want to get the pid for explorer.exe, then the function should give me the pid 1156.

Can anyone help me with an understandable code example.

Thank you for every help,
keeper

You do realize that there could be multiple instances of the process explorer.exe running, right?

Search the forums, especially the Windows programming forum. I'm sure it's come up before.

[edit] Searching for "process id" in the Windows forum (eventually) led me to this: http://cboard.cprogramming.com/showthread.php?t=90109

It links to this: http://cboard.cprogramming.com/showthread.php?t=90069

To be exact: http://cboard.cprogramming.com/showp...94&postcount=4 [/edit]

Quote:

---

Originally Posted by dwks

You do realize that there could be multiple instances of the process explorer.exe running, right?

Search the forums, especially the Windows programming forum. I'm sure it's come up before.

[edit] Searching for "process id" in the Windows forum (eventually) led me to this: http://cboard.cprogramming.com/showthread.php?t=90109

It links to this: http://cboard.cprogramming.com/showthread.php?t=90069

To be exact: http://cboard.cprogramming.com/showp...94&postcount=4 [/edit]

---

Yes I realize that, it was only an example.

I try the code in the topics you post, but I have some problems with that. I get the error: main.c(13): error C2143: syntax error : missing ';' before 'type'

An in this line I have:

l12: num_processes = bytes_returned/sizeof(DWORD);
l13: for(int i = 0; i<num_processes; i++) {
l14: hProcess=OpenProcess(PROCESS_ALL_ACCESS,TRUE,proce ss_id_array[i]);


and this error: main.c(47): error C2275: 'DWORD' : illegal use of this type as an expression

An in this line I have:

l47: DWORD dwPID = GetProcessByFileName("Notepad.exe");
l48: printf(dwPID);


Whats wrong here?

There's a space...

Code:

---

proce ss_id_array[i]

---

printf needs a format string. Besides, is this C or C++?

Code:

---

printf(dwPID);

---

> I get the error: main.c(13): error C2143: syntax error : missing ';' before 'type'
That's because "for ( int i " is a C++ thing, not a C thing (not yet anyway), and you're compiling the code as a C program.

Choose your language, pick your forum, post your code.

I use the english version of Visual Studio C++ 2003 with the standard settings.

Code:

---

DWORD GetProcessByFileName(char* name){
    DWORD process_id_array[1024];
    DWORD bytes_returned;
    DWORD num_processes;
    HANDLE hProcess;
    char image_name[256];
    char buffer[256];
        int i;
    DWORD exitcode;
    EnumProcesses(process_id_array, 256*sizeof(DWORD), &bytes_returned);
    num_processes = (bytes_returned/sizeof(DWORD));
    for (i = 0; i < num_processes; i++) {
        hProcess=OpenProcess(PROCESS_ALL_ACCESS,TRUE,process_id_array[i]);
        if(GetModuleBaseName(hProcess,0,image_name,256)){
            if(!stricmp(image_name,name)){
                CloseHandle(hProcess);
                return process_id_array[i];
            }
        }
        CloseHandle(hProcess);
    }
    return 0;
}
void __cdecl main(int argc, char *argv[])
{
        DWORD dwPID;
        dwPID = GetProcessByFileName("Notepad.exe");
        printf(dwPID);
        return;
}

---

Now I get these errors:

Inject error LNK2005: __chkstk already defined in ntdll.lib(ntdll.dll)

Inject fatal error LNK1169: one or more multiply defined symbols found

Have you read the replies thus far?

Code:

---

printf(dwPID);

---

->

Code:

---

printf("%lu", (unsigned long)dwPID);

---

void main() is not standard, you should be using int main(). See the FAQ.

What are your linker options? Do you have one library repeated twice?

Quote:

---

Originally Posted by dwks

Have you read the replies thus far?

Code:

---

printf(dwPID);

---

->

Code:

---

printf("%lu", (unsigned long)dwPID);

---

void main() is not standard, you should be using int main(). See the FAQ.

What are your linker options? Do you have one library repeated twice?

---

Yes I read the replies. And I think I get this working, if I get solve this problem:
http://cboard.cprogramming.com/showthread.php?t=91082 first. The problem is the same here mixing c and c++ files.
Have you any ideas for the problem in the other thread?

Create a new console project, and copy your latest source code to the new project.

Quote:

---

Originally Posted by Salem

Create a new console project, and copy your latest source code to the new project.

---

Making a complete new project insert the code from above (06-22-2007 03:58 AM) nothing more I get these errors:

process.cpp error C2146: syntax error : missing ';' before identifier 'GetProcessByFileName'

process.cpp error C2501: 'DWORD' : missing storage-class or type specifiers

process.cpp(2): error C2146: syntax error : missing ';' before identifier 'process_id_array'

process.cpp(4): error C2065: 'num_processes' : undeclared identifier

and many more.

have you #include <windows.h> ?

Quote:

---

Originally Posted by vart

have you #include <windows.h> ?

---

Thanks now there are less errors:

process.cpp(12): error C3861: 'EnumProcesses': identifier not found, even with argument-dependent lookup

process.cpp(16): error C3861: 'GetModuleBaseName': identifier not found, even with argument-dependent lookup

OK get it working :)

Code:

---

#include <windows.h>
#include <tlhelp32.h>
#include <iostream>       
#include <string>
#include "psapi.h"

DWORD GetProcessByFileName(char* name){
    DWORD process_id_array[1024];
    DWORD bytes_returned;
    DWORD num_processes;
    HANDLE hProcess;
    char image_name[256];
    char buffer[256];
        int i;
    DWORD exitcode;
    EnumProcesses(process_id_array, 256*sizeof(DWORD), &bytes_returned);
    num_processes = (bytes_returned/sizeof(DWORD));
    for (i = 0; i < num_processes; i++) {
        hProcess=OpenProcess(PROCESS_ALL_ACCESS,TRUE,process_id_array[i]);
        if(GetModuleBaseName(hProcess,0,image_name,256)){
            if(!stricmp(image_name,name)){
                CloseHandle(hProcess);
                return process_id_array[i];
            }
        }
        CloseHandle(hProcess);
    }
    return 0;
}
void __cdecl main(int argc, char *argv[])
{
        DWORD dwPID;
        dwPID = GetProcessByFileName("calc.exe");
        printf("%lu", (unsigned long)dwPID);
        return;
}

---

But only for Debug compilation not for release. When I use release I get these linker errors:

processid error LNK2019: unresolved external symbol _GetModuleBaseNameA@16 referenced in function "unsigned long __cdecl GetProcessByFileName(char *)" (?GetProcessByFileName@@YAKPAD@Z)

processid error LNK2019: unresolved external symbol _EnumProcesses@12 referenced in function "unsigned long __cdecl GetProcessByFileName(char *)" (?GetProcessByFileName@@YAKPAD@Z)

Why?

Check that both versions have the same list of libraries in the project settings.

Code:

---


#include "psapi.h"

to

#include <psapi.h>

and

        printf("%lu", (unsigned long)dwPID);
        return;
}

to

        printf("%lu", (unsigned long)dwPID);
        return 0;
}

---

getting unresolved external.

Quote:

---

Originally Posted by kryptkat

Code:

---

and

        printf("%lu", (unsigned long)dwPID);
        return;
}

to

        printf("%lu", (unsigned long)dwPID);
        return 0;
}

---

getting unresolved external.

---

Well in that case I would imagine the void main is also up for modification:

Code:

---

int __cdecl main(int argc, char *argv[])

---

Code:

---

C:\borland\bcc55\bin>bcc32 processid.cpp
Borland C++ 5.5.1 for Win32 Copyright (c) 1993, 2000 Borland
processid.cpp:
Warning W8012 processid.cpp 31: Comparing signed and unsigned values in functi
on GetProcessByFileName(char *)
Warning W8057 processid.cpp 57: Parameter 'argc' is never used in function mai
n(int,char * *)
Warning W8057 processid.cpp 57: Parameter 'argv' is never used in function mai
n(int,char * *)
Turbo Incremental Link 5.00 Copyright (c) 1997, 2000 Borland
Error: Unresolved external 'EnumProcesses' referenced from C:\BORLAND\BCC55\BIN\
processid.OBJ
Error: Unresolved external 'GetModuleBaseNameA' referenced from C:\BORLAND\BCC55
\BIN\processid.OBJ

C:\borland\bcc55\bin>

---

did the int main thing .... forgot to say....

missing header?

Missing import library.

if i compile as win32 i get missing winmain if i try other libs like import32.lib and cw32.lib same error.

which import lib missing?

found it! psapi.lib was hiding in psdk.