ns-winnt-activation_context_compatibility_information.md

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NS:winnt._ACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION	ACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION (winnt.h)	The ACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION structure is used by the QueryActCtxW function.	*PACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION ACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION ACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION structure [Setup API] PACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION PACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION structure pointer [Setup API] _ACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION setup.activation_context_compatibility_information winnt/ACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION winnt/PACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION	setup\activation_context_compatibility_information.htm	setup	d8c1ef4a-8e64-45bd-a185-b4af7932a0d2	12/05/2018	*PACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION, ACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION, ACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION structure [Setup API], PACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION, PACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION structure pointer [Setup API], _ACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION, setup.activation_context_compatibility_information, winnt/ACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION, winnt/PACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION	winnt.h	Windows.h	Windows	Windows 7 [desktop apps only]	Windows Server 2008 R2 [desktop apps only]													Windows	ACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION, *PACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION		19H1	_ACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION winnt/_ACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION PACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION winnt/PACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION ACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION winnt/ACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION	c++	APIRef kbSyntax	HeaderDef	Winnt.h	ACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION

ACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION structure

-description

The ACTIVATION_CONTEXT_COMPATIBILITY_INFORMATION structure is used by the QueryActCtxW function.

-struct-fields

-field ElementCount

The number of compatibility elements defined in the application manifest.

-field 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;
	 }