ClickOnce unmanaged API reference
Applies to: 
Visual Studio 
Visual Studio for Mac
Note
This article applies to Visual Studio 2017. If you're looking for the latest Visual Studio documentation, see Visual Studio documentation. We recommend upgrading to the latest version of Visual Studio. Download it here
ClickOnce unmanaged public APIs from dfshim.dll.
CleanOnlineAppCache
Cleans or uninstalls all online applications from the ClickOnce application cache.
Return value
If successful, returns S_OK; otherwise, returns an HRESULT that represents the failure. If a managed exception occurs, returns 0x80020009 (DISP_E_EXCEPTION).
Remarks
Calling CleanOnlineAppCache will start the ClickOnce service if it is not already running.
GetDeploymentDataFromManifest
Retrieves deployment information from the manifest and activation URL.
Parameters
| Parameter | Description | Type |
|---|---|---|
pcwzActivationUrl |
A pointer to the ActivationURL. |
LPCWSTR |
pcwzPathToDeploymentManifest |
A pointer to the PathToDeploymentManifest. |
LPCWSTR |
pwzApplicationIdentity |
A pointer to a buffer to receive a NULL-terminated string that specifies the full application identity returned. | LPWSTR |
pdwIdentityBufferLength |
A pointer to a DWORD that is the length of the pwzApplicationIdentity buffer, in WCHARs. This includes the space for the NULL termination character. |
LPDWORD |
pwzProcessorArchitecture |
A pointer to a buffer to receive a NULL-terminated string that specifies the processor architecture of the application deployment, from the manifest. | LPWSTR |
pdwArchitectureBufferLength |
A pointer to a DWORD that is the length of the pwzProcessorArchitecture buffer, in WCHARs. |
LPDWORD |
pwzApplicationManifestCodebase |
A pointer to a buffer to receive a NULL-terminated string that specifies the codebase of the application manifest, from the manifest. | LPWSTR |
pdwCodebaseBufferLength |
A pointer to a DWORD that is the length of the pwzApplicationManifestCodebase buffer, in WCHARs. |
LPDWORD |
pwzDeploymentProvider |
A pointer to a buffer to receive a NULL-terminated string that specifies the deployment provider from the manifest, if present. Otherwise, an empty string is returned. | LPWSTR |
pdwProviderBufferLength |
A pointer to a DWORD that is the length of the pwzProviderBufferLength. |
LPDWORD |
Return value
If successful, returns S_OK; otherwise, returns an HRESULT that represents the failure. Returns HRESULTFROMWIN32(ERROR_INSUFFICIENT_BUFFER) if a buffer is too small.
Remarks
Pointers must not be null. pcwzActivationUrl and pcwzPathToDeploymentManifest must not be empty.
It is the caller's responsibility to clean up the activation URL. For example, adding escape characters where they are needed or removing the query string.
It is the caller's responsibility to limit the input length. For example, the maximum URL length is 2KB.
LaunchApplication
Launches or installs an application by using a deployment URL.
Parameters
| Parameter | Description | Type |
|---|---|---|
deploymentUrl |
A pointer to a NULL-terminated string that contains the URL of the deployment manifest. | LPCWSTR |
data |
Reserved for future use. Must be NULL. | LPVOID |
flags |
Reserved for future use. Must be 0. | DWORD |
Return value
If successful, returns S_OK; otherwise, returns an HRESULT that represents the failure. If a managed exception occurs, returns 0x80020009 (DISP_E_EXCEPTION).