IOpcDigitalSignature::GetNamespaces method (msopc.h)

Article
10/13/2021

Gets the prefix and namespace mapping of the Signature element of the signature markup.

Syntax

HRESULT GetNamespaces(
  [out] LPWSTR **prefixes,
  [out] LPWSTR **namespaces,
  [out] UINT32 *count
);

Parameters

[out] prefixes

A pointer to a buffer of XML prefix strings. If the method succeeds, call the CoTaskMemFree function to free the memory of each string in the buffer and then to free the memory of the buffer itself.

[out] namespaces

A pointer to a buffer of XML namespace strings. If the method succeeds, call the CoTaskMemFree function to free the memory of each string in the buffer and then to free the memory of the buffer itself.

[out] count

The size of the prefixes and namespaces buffers.

Return value

The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.

Return code	Description
S_OK	The method succeeded.
E_POINTER	The prefixes parameter is NULL.
E_POINTER	The namespaces parameter is NULL.
E_POINTER	The count parameter is NULL.

Remarks

The prefixes and namespaces buffers are mapped to each other by index.

This method allocates memory used by the buffers returned in prefixes and namespaces and the strings contained in each buffer.

Examples

The following code shows how to use CoTaskMemFree to free the memory of the buffers and the strings they contain.

// Prepare to call GetNamespaces
LPWSTR* prefixes = NULL;
LPWSTR* namespaces = NULL;
UINT32 count = 0;

// Call to GetNamespaces succeeds
if ( SUCCEEDED( signature->GetNamespaces(&prefixes, &namespaces, &count) ) )
{
    // Process strings in prefixes and namespaces as needed for the application

    // Free memory for each string
    for (UINT32 i = 0; i < count; i++)
    {
        CoTaskMemFree(prefixes[i]);
        CoTaskMemFree(namespaces[i]);
    }
    // Free memory for the buffers
    CoTaskMemFree(prefixes);
    CoTaskMemFree(namespaces);
}

Requirements

Requirement	Value
Minimum supported client	Windows 7 [desktop apps only]
Minimum supported server	Windows Server 2008 R2 [desktop apps only]
Target Platform	Windows
Header	msopc.h

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