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    <p>For Win32 API way, you need <strong>GetProcessMemoryInfo</strong> function. Here is an example from <a href="http://msdn.microsoft.com/en-us/library/ms682050(VS.85).aspx" rel="nofollow noreferrer">MSDN page</a> but the code is in C++. I think you can convert it to Delphi as well. What you are looking is probably called "Working Set Size."</p> <pre><code>#include &lt;windows.h&gt; #include &lt;stdio.h&gt; #include &lt;psapi.h&gt; void PrintMemoryInfo( DWORD processID ) { HANDLE hProcess; PROCESS_MEMORY_COUNTERS pmc; // Print the process identifier. printf( "\nProcess ID: %u\n", processID ); // Print information about the memory usage of the process. hProcess = OpenProcess( PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, processID ); if (NULL == hProcess) return; if ( GetProcessMemoryInfo( hProcess, &amp;pmc, sizeof(pmc)) ) { printf( "\tPageFaultCount: 0x%08X\n", pmc.PageFaultCount ); printf( "\tPeakWorkingSetSize: 0x%08X\n", pmc.PeakWorkingSetSize ); printf( "\tWorkingSetSize: 0x%08X\n", pmc.WorkingSetSize ); printf( "\tQuotaPeakPagedPoolUsage: 0x%08X\n", pmc.QuotaPeakPagedPoolUsage ); printf( "\tQuotaPagedPoolUsage: 0x%08X\n", pmc.QuotaPagedPoolUsage ); printf( "\tQuotaPeakNonPagedPoolUsage: 0x%08X\n", pmc.QuotaPeakNonPagedPoolUsage ); printf( "\tQuotaNonPagedPoolUsage: 0x%08X\n", pmc.QuotaNonPagedPoolUsage ); printf( "\tPagefileUsage: 0x%08X\n", pmc.PagefileUsage ); printf( "\tPeakPagefileUsage: 0x%08X\n", pmc.PeakPagefileUsage ); } CloseHandle( hProcess ); } int main( ) { // Get the list of process identifiers. DWORD aProcesses[1024], cbNeeded, cProcesses; unsigned int i; if ( !EnumProcesses( aProcesses, sizeof(aProcesses), &amp;cbNeeded ) ) return 1; // Calculate how many process identifiers were returned. cProcesses = cbNeeded / sizeof(DWORD); // Print the memory usage for each process for ( i = 0; i &lt; cProcesses; i++ ) PrintMemoryInfo( aProcesses[i] ); return 0; } </code></pre>
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    1. POHow to get the Memory Used by a Delphi Program
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    1. USGant
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    1. COThanks for starting it off. Right answer but wrong language and too complicated.
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