How to Load DLL from Memory

BoxedApp SDK allows you to embed a DLL and load it directly from memory, without ever writing it to disk. The DLL is stored in the virtual file system and made accessible to the process through API virtualization.

This approach makes the DLL invisible to the operating system’s file system while still being available to the application via LoadLibrary. From the application’s perspective, the DLL behaves exactly as if it had been loaded from a normal file path, but in reality it exists only in memory.

This technique is useful when you need to protect sensitive libraries from extraction or tampering, deliver a single self-contained executable without external dependencies, load plug-ins, codecs, or runtime components directly from memory, and avoid creating temporary files while keeping the application’s footprint minimal.

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C++ Sample

HANDLE hFile__DLL1 = 
    BoxedAppSDK_CreateVirtualFile(
        _T("Z:\\DLL1.dll"), 
        GENERIC_WRITE, 
        FILE_SHARE_READ, 
        NULL, 
        CREATE_NEW, 
        0, 
        NULL
    );
 
DWORD dwTemp;
WriteFile(hFile__DLL1, pBuffer, dwSize, &dwTemp, NULL);
 
CloseHandle(hFile__DLL1);
 
// ...
 
HMODULE hModule = LoadLibrary(_T("Z:\\DLL1.dll"));
 
typedef void (WINAPI *P_Function)();
P_Function pFunction = (P_Function)GetProcAddress(hModule, "Function");
 
pFunction();
 
FreeLibrary(hModule);