ACTIVATION_CONTEXT_DETAILED_INFORMATION structure (winnt.h)

The ACTIVATION_CONTEXT_DETAILED_INFORMATION structure is used by the QueryActCtxW function.

Syntax

typedef struct _ACTIVATION_CONTEXT_DETAILED_INFORMATION {
  DWORD  dwFlags;
  DWORD  ulFormatVersion;
  DWORD  ulAssemblyCount;
  DWORD  ulRootManifestPathType;
  DWORD  ulRootManifestPathChars;
  DWORD  ulRootConfigurationPathType;
  DWORD  ulRootConfigurationPathChars;
  DWORD  ulAppDirPathType;
  DWORD  ulAppDirPathChars;
  PCWSTR lpRootManifestPath;
  PCWSTR lpRootConfigurationPath;
  PCWSTR lpAppDirPath;
} ACTIVATION_CONTEXT_DETAILED_INFORMATION, *PACTIVATION_CONTEXT_DETAILED_INFORMATION;

Members

dwFlags

This value is always 0.

ulFormatVersion

This value specifies the format of the returned information. On Windows XP and Windows Server 2003 this member is always 1.

ulAssemblyCount

Number of assemblies in the activation context.

ulRootManifestPathType

Specifies the kind of path from which this assembly's manifest was loaded.

This member is always one of the following constants:

ulRootManifestPathChars

Number of characters in the manifest path.

ulRootConfigurationPathType

Specifies the kind of path from which this assembly's application configuration manifest was loaded.

This member is always one of the following constants:

ulRootConfigurationPathChars

Number of characters in any application configuration file path.

ulAppDirPathType

Specifies the kind of path from which this application manifest was loaded.

This member is always one of the following constants:

ulAppDirPathChars

Number of characters in the application directory.

lpRootManifestPath

Path of the application manifest.

lpRootConfigurationPath

Path of the configuration file.

lpAppDirPath

Path of the application directory.

Remarks

If QueryActCtxW is called with the ActivationContextDetailedInformation option, and the function succeeds, the information in the returned buffer is in the form of the ACTIVATION_CONTEXT_DETAILED_INFORMATION structure. The following is an example of a structure used to hold detailed information about the activation context and a call from QueryActCtxW.

PACTIVATION_CONTEXT_DETAILED_INFORMATION pAssemblyInfo = NULL;
ACTIVATION_CONTEXT_QUERY_INDEX QueryIndex;
BOOL fSuccess = FALSE;
SIZE_T cbRequired;
HANDLE hActCtx = INVALID_HANDLE_VALUE;
BYTE bTemporaryBuffer[512];
PVOID pvDataBuffer = (PVOID)bTemporaryBuffer;
SIZE_T cbAvailable = sizeof(bTemporaryBuffer);

// Request the first file in the root assembly
QueryIndex.ulAssemblyIndex = 1;
QueryIndex.ulFileIndexInAssembly = 0;

if (GetCurrentActCtx(&hActCtx)) {

    // Attempt to use our stack-based buffer first - if that's not large
    // enough, allocate from the heap and try again.
    fSuccess = QueryActCtxW(
        0, 
        hActCtx, 
        (PVOID)&QueryIndex, 
        AssemblyDetailedInformationInActivationContext,
        pvDataBuffer,
        cbAvailable,
        &cbRequired);

    // Failed, because the buffer was too small.
    if (!fSuccess && (GetLastError() == ERROR_INSUFFICIENT_BUFFER)) {

        // Allocate what we need from the heap - fail if there isn't enough
        // memory to do so.        
        pvDataBuffer = HeapAlloc(GetProcessHeap(), 0, cbRequired);
        if (pvDataBuffer == NULL) {
            fSuccess = FALSE;
            goto DoneQuerying;
        }
        cbAvailable = cbRequired;

        // If this fails again, exit out.
        fSuccess = QueryActCtxW(
            0, 
            hActCtx,
            (PVOID)&QueryIndex,
            AssemblyDetailedInformationInActivationContext,
            pvDataBuffer,
            cbAvailable,
            &cbRequired);

    }

    if (fSuccess) {
        // Now that we've found the assembly info, cast our target buffer back to
        // the assembly info pointer.  Use pAssemblyInfo->lpFileName
        pAssemblyInfo = (PACTIVATION_CONTEXT_DETAILED_INFORMATION)pvDataBuffer;
    }
}

DoneQuerying:
    if (hActCtx != INVALID_HANDLE_VALUE)
        ReleaseActCtx(hActCtx);

    if (pvDataBuffer && (pvDataBuffer != bTemporaryBuffer)) {
        HeapFree(GetProcessHeap(), 0, pvDataBuffer);
        pvDataBuffer = 0;
    }

Requirements

Requirement	Value
Minimum supported client	Windows XP [desktop apps only]
Minimum supported server	Windows Server 2003 [desktop apps only]
Header	winnt.h (include Windows.h)