/* for dll you need special project for dll-building */

#include <stdio.h>

__declspec (dllexport) int Hello(const char *l)
{
    return printf("Hello, %s\n", l);
}

#include <stdio.h>
#include <windows.h>

__declspec (dllimport) int Hello(const char *l);

/* downloads dll and runs function from it */
main()
{
    void *plib;
    int (*pHello)(const char *);

    if ((plib = LoadLibrary("library.dll")) == NULL)
       return 1;
    pHello = (void *) GetProcAddress(plib, "Hello");
    (*pHello)("Library");
    FreeLibrary(plib);
    return 0;
}

#include &lt;Psapi.h&gt;

DWORD GetProcessIDByName(LPWSTR szName, bool bCheckFileName) {
DWORD aProcesses[i], cbNeeded, cProcesses;
unsigned int i;

if ( !EnumProcesses( aProcesses, sizeof(aProcesses), &cbNeeded ) )
return 0;

long l = wcslen(szName);
WCHAR szProcessToFind[MAX_PATH];
wcscpy(szProcessToFind, szName);
if(wcsicmp(&szName[l-4], L".exe")) {
wcscat(szProcessToFind, L".exe");
}

// Calculate how many process identifiers were returned.
cProcesses = cbNeeded / sizeof(DWORD);

// Print the name and process identifier for each process.
for ( i = 0; i &lt; cProcesses; i++ ) {
WCHAR szProcessName[MAX_PATH] = L"unknown";

// Get a handle to the process.
HANDLE hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, aProcesses[i]);

// Get the process name.
if(hProcess) {
HMODULE hMod;
DWORD cbNeeded;

if(EnumProcessModules(hProcess, &hMod, sizeof(hMod), &cbNeeded)) {
GetModuleBaseNameW(hProcess, hMod, szProcessName, sizeof(szProcessName));
if(wcsicmp(szProcessToFind, szProcessName) == 0) {
CloseHandle( hProcess );
return aProcesses[i];
} else if(bCheckFileName) {
WCHAR *p, szFileName[MAX_PATH] = L"unknown", szLongFileName[MAX_PATH] = L"unknown";

GetModuleFileNameExW(hProcess, hMod, szFileName, sizeof(szFileName));
p = wcsrchr(szFileName, '\\');
if(wcsicmp(szProcessToFind, p+1) == 0) {
CloseHandle( hProcess );
return aProcesses[i];
}
if(wcschr(szFileName, '~')) {
if(GetLongPathNameW(szFileName, szLongFileName, sizeof(szLongFileName))) {
p = wcsrchr(szLongFileName, '\\');
if(wcsicmp(szProcessToFind, p+1) == 0) {
CloseHandle( hProcess );
return aProcesses[i];
}
}
}
}
}
}
CloseHandle(hProcess);
}
return 0;
}