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typedef int (__cdecl *SETINT)(int);
typedef int (__cdecl *GETINT)(void);

HINSTANCE hinstLib = LoadLibrary(TEXT("F:\\temp\\M_GV_d.dll"));

SETINT SetInt = (SETINT) GetProcAddress(hinstLib, "GV_SetInteger");
GETINT GetInt = (GETINT) GetProcAddress(hinstLib, "GV_GetInteger");

SCSFExport scsf_ExternalCallTest(SCStudyInterfaceRef sc)
{
SCSubgraphRef Volume = sc.Subgraph[0];

if (sc.SetDefaults) {
sc.GraphName = "ExternalCallTest";
sc.StudyDescription = "ExternalCallTest.";
sc.AutoLoop = 1;

Volume.Name = "Volume from Dll";
Volume.DrawStyle = DRAWSTYLE_BAR;
Volume.LineWidth = 2;
Volume.PrimaryColor = RGB(0, 255, 0);
sc.FreeDLL = FREEDLL;

return;
}

if (sc.LastCallToFunction) {
FreeLibrary(hinstLib);
return;
}

SetInt((int)sc.Volume[sc.Index]);
Volume[sc.Index] = GetInt();

return;
}