ACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION structure (winnt.h)

The ACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION structure is used by the QueryActCtxW function.

Syntax

typedef struct _ACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION {
 DWORD ElementCount;
 COMPATIBILITY_CONTEXT_ELEMENT Elements[];
} ACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION, *PACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION;

Members

ElementCount

The number of compatibility elements defined in the application manifest.

Elements

This is an array of COMPATIBILITY_CONTEXT_ELEMENT structures. Each structure describes one compatibility element in the application manifest.

Remarks

The following example requires Windows Server 2008 R2 or Windows 7 and shows the method to retrieve information about the compatibility context.

HANDLE ActCtxHandle=INVALID_HANDLE_VALUE;
SIZE_T BytesWritten=0;
PACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION CtxCompatInfo=NULL;

// Query the compatibility information size
bReturn = QueryActCtxW(0, 
 ActCtxHandle,
 NULL,
 CompatibilityInformationInActivationContext,
 NULL,
 0,
 &BytesWritten);

if (bReturn == FALSE && GetLastError() !=ERROR_INSUFFICIENT_BUFFER)
 {
	 goto EXIT;
	 }
	 
CtxCompatInfo = 
(PACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION)HeapAlloc(GetProcessHeap(), 
 HEAP_ZERO_MEMORY, BytesWritten);

if (CtxCompatInfo==NULL)
 {
	 // Out of memory
	 goto EXIT;
	 }

// Query the compatibility information
bReturn = QueryActCtxW(0,
 ActCtxHandle,
 NULL,
 CompatibilityInformationInActivationContext,
 CtxCompatInfo,
 BytesWritten,
 &BytesWritten);

if (bReturn==FALSE)
 {
 // Unexpected error: use GetLastError() to check
 goto EXIT;
	 }

for (DWORD ElementIndex=0; ElementIndex < CtxCompatInfo->ElementCount; ElementIndex ++)
{
PCOMPATIBILITY_CONTEXT_ELEMENT ContextElement = &CtxCompatInfo->Elements[ElementIndex];
if (ContextElement->Type == ACTCTX_COMPATIBILITY_ELEMENT_TYPE_OS)
 {
 if (memcmp(&ContextElement->Id, &WIN7_CONTEXT_GUID, sizeof (GUID))==0)
 {printf_s("Windows 7 is supported");}
	 }
}
	 
EXIT:
if (ActCtxHandle != INVALID_HANDLE_VALUE) 
 {
 ReleaseActCtx (ActCtxHandle)
	 }
if (CtxCompatInfo != NULL)
 {
 RtlFreeHeap (RtlProcessHeap (), 0, CtxCompatInfo);
 CtxCompatInfo = NULL;
	 }

Requirements