SccAddFromScc function
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
This function allows the user to browse for files that are already in the source control system and subsequently make those files part of the current project. For example, this function can get a common header file into the current project without copying the file. The return array of files, lplpFileNames, contains the list of files that the user wants to add to the IDE project.
Syntax
SCCRTN SccAddFromScc (
LPVOID pvContext,
HWND hWnd,
LPLONG lpnFiles,
LPCSTR** lplpFileNames
);
Parameters
pvContext
[in] The source control plug-in context structure.
hWnd
[in] A handle to the IDE window that the source control plug-in can use as a parent for any dialog boxes that it provides.
lpnFiles
[in, out] A buffer for the number of files that are being added in. (This is NULL if the memory pointed to by lplpFileNames is to be released. See Remarks for details.)
lplpFileNames
[in, out] An array of pointers to all the file names without directory paths. This array is allocated and freed by the source control plug-in. If lpnFiles = 1 and lplpFileNames is not NULL, the first name in the array pointed to by lplpFileNames contains the destination folder.
Return Value
The source control plug-in implementation of this function is expected to return one of the following values:
| Value | Description |
|---|---|
| SCC_OK | The files were successfully located and added to the project. |
| SCC_I_OPERATIONCANCELED | Operation was canceled with no effect. |
| SCC_I_RELOADFILE | A file or project needs to be reloaded. |
Remarks
The IDE calls this function. If the source control plug-in supports specifying a local destination folder, the IDE passes lpnFiles = 1 and passes the local folder name into lplpFileNames.
When the call to the SccAddFromScc function returns, the plug-in has assigned values to lpnFiles and lplpFileNames, allocating the memory for the file name array as necessary (note that this allocation replaces the pointer in lplpFileNames). The source control plug-in is responsible for placing all files into the user's directory or in the specified designation folder. The IDE then adds the files to the IDE project.
Finally, the IDE calls this function a second time, passing in NULL for lpnFiles. This is interpreted as a special signal by the source control plug-in to release the memory allocated for the file-name array in lplpFileNames``.
lplpFileNames is a char *** pointer. The source control plug-in places a pointer to an array of pointers to file names, thus passing the list in the standard way for this API.
Note
Initial versions of the VSSCI API did not provide a way to indicate the target project for the added files. To accommodate this, the semantics of the lplpFIleNames parameter have been enhanced to make it an in/out parameter rather than an output parameter. If only a single file is specified, that is, the value pointed to by lpnFiles = 1, then the first element of lplpFileNames contains the target folder. To use these new semantics, the IDE calls the SccSetOption function with the nOptionparameter set to SCC_OPT_SHARESUBPROJ. If a source control plug-in does not support the semantics, it returns SCC_E_OPTNOTSUPPORTED. Doing so disables the use of the Add from Source Control feature. If a plug-in supports the Add from Source Control feature (SCC_CAP_ADDFROMSCC), then it must support the new semantics and return SCC_I_SHARESUBPROJOK.