Original Address: http: //blog.kalmbachnet.de/ postid = 9 Some applications require a huge amount of continues memory And sometimes, windows is not able to satisfy the request To find out the reason of why the virtual memory is?.. Badly s Larges Continous Memory Block, You Can Use The Following Code To Get The Info About The Virtual Address Space:
#include
#include
#include
#include
#pragma comment (lib, "psapi.lib")
Void PrintMeminfo (Memory_basic_Information & MBI)
{
IF (Mbi.State! = MEM_FREE)
Return;
_tprintf (_T ("BaseAddress: 0x% 8.8X, 0x% 8.8X, 0x% 8.8X / N"),
Mbi.Baseaddress, Mbi.allocationBase, Mbi.allocationProtect);
_tprintf (_T ("Regionsize: 0x% 8.8x / n"), MBI.REGIONSize;
_tprintf (_T ("state:"));
Switch (Mbi.State)
{
Case Mem_Commit:
_tprintf (_T ("commit / n"));
Break;
Case Mem_Free:
_tprintf (_T ("free / n"));
Break;
Case Mem_Reserve:
_tprintf (_t ("reserve / n"));
Break;
DEFAULT:
_tprintf (_t ("unknown / n"));
Break;
}
_tprintf (_T ("type:"));
Switch (Mbi.Type)
{
Case Mem_Image:
_tprintf (_t ("image / n"));
Break;
Case MEM_MAPPED:
_tprintf (_t ("mapped / n")));
Break;
Case Mem_Private:
_tprintf (_t ("private / n"));
Break;
DEFAULT:
_tprintf (_T ("unknown (% d) / n"), mbi.type);
Break;
}
_tprintf (_t ("/ n"));
}
Void PrintModules (DWORD Processid)
{
HModule HMODS [1024];
Handle HPROCESS;
DWORD CBNEDED;
Unsigned Int i;
_tprintf (_t ("/ nprocess id:% u / n"), processid;
HProcess = OpenProcess (Process_Query_Information | Process_VM_Read, False, ProcessID);
IF (null hprocess) return;
IF (HProcessModules (HProcess, HMODS, SIZEOF (HMODS), & CBNeeded)
{
For (i = 0; cbeneeded / sizeof (hmodule)); i )
{
Tchar SzmodName [MAX_PATH];
IF (GetModuleFileNameex (HProcess, HMODS [I], SzModName, Sizeof (SzmodName)))
{
_tprintf (_t ("/ t% s (0x% 08x) / n"), SzmodName, HMODS [I]);
}
}
}
CloseHandle (HPROCESS);
}
SIZE_T GetLargestFreeMemRegion (LPVOID * LPBASEADDR, BOOL ShowMemInfo)
{
System_info systeminfo;
GetSystemInfo (& SystemInfo);
Void * p = 0;
Memory_basic_information mbi;
SIZE_T LARGESTSIZE = 0;
While (P { SIZE_T DWRET = VirtualQuery (P, & MBI, SIZEOF (MBI)); IF (dwret> 0) { IF (ShowMeminfo) PrintMemInfo (MBI); IF (Mbi.State Mem_Free) { Largestsize { Largestsize = mbi.regionsize; IF (LPBaseAddr! = NULL) * lpbaseaddr = mbi.baseaddress; } } P = (void *) ((char *) p) mbi.regionSize; } Else { IF (ShowMeminfo) _tprintf (_t ("### VirtualQuery Failed (% P) / N"), P); P = (void *) ((char *) p) systemInfo.dwpagesize; } } Return Largestsize; } Int_tmain () { LPVOID BaseAddr; SIZE_T LS = GetLargestFreeMemregion (& BaseAddr, true); PRINTMODULES (GetCurrentProcessid ()); _tprintf ("/ nlargest free region: 0x% 8.8x Bytes AT 0x% 8.8x / n"), LS, BaseAddr; Return 0; }
