The VerInstallFile function attempts to install the specified file based on information returned from the VerFindFile function. VerInstallFile decompresses the file, if necessary, assigns a unique filename, and checks for errors, such as outdated files.
As with the other file installation functions, VerInstallFile will only work with Win32 file images. 16-bit Windows file images are not supported.
DWORD VerInstallFile(
| DWORD uFlags, | // bit flags that condition function behavior |
| LPTSTR szSrcFileName, | // file to install |
| LPTSTR szDestFileName, | // new name of file to install |
| LPTSTR szSrcDir, | // source directory of file to install |
| LPTSTR szDestDir, | // directory in which to install file |
| LPTSTR szCurDir, | // directory where file is currently installed |
| LPTSTR szTmpFile, | // receives name of temporary copy of file used during installation |
| PUINT lpuTmpFileLen | // size of string in szTmpFile |
| ); |
Parameters
uFlags
Contains a bitmask of flags. This parameter can be one of the following values:
| Flag | Description |
| VIFF_FORCEINSTALL | Installs the file regardless of mismatched version numbers. The function checks only for physical errors during installation. |
| VIFF_DONTDELETEOLD | Installs the file without deleting the previously installed file, if the previously installed file is not in the destination directory. |
All other values are reserved.
szSrcFileName
Points to the name of the file to be installed. This is the filename in the directory pointed to by the szSrcDir parameter; the filename can include only the filename and extension, not a path.
szDestFileName
Points to the name VerInstallFile will give the new file upon installation. This filename may be different from the filename in the szSrcFileName directory. The new name should include only the filename and extension, not a path.
szSrcDir
Points to a buffer that contains the name of the directory where the new file is found.
szDestDir
Points to a buffer that contains the name of the directory where the new file should be installed. VerFindFile returns this value in its szDestDir parameter.
szCurDir
Points to a buffer that contains the name of the directory where the preexisting version of this file is found. VerFindFile returns this value in its szCurDir parameter.
szTmpFile
Points to a buffer that should be empty upon the initial call to VerInstallFile. The function fills the buffer with the name of a temporary copy of the source file. The buffer should be at least _MAX_PATH characters long, although this is not required.
lpuTmpFileLen
Points to a variable that contains the length of the szTmpFile buffer. This pointer must not be NULL.
When the function returns, lpuTmpFileLen contains the size, in characters, of the data returned in szTmpFile, including the terminating null character. If the buffer is too small to contain all the data, lpuTmpFileLen will be the size of the buffer required to hold the data.
Return Values
The return value is a bitmask that indicates exceptions. It can be one or more of the following values:
| Value | Meaning |
| VIF_TEMPFILE | The temporary copy of the new file is in the destination directory. The cause of failure is reflected in other flags. |
| VIF_MISMATCH | The new and preexisting files differ in one or more attributes. This error can be overridden by calling VerInstallFile again with the VIFF_FORCEINSTALL flag set. |
| VIF_SRCOLD | The file to install is older than the preexisting file. This error can be overridden by calling VerInstallFile again with the VIFF_FORCEINSTALL flag set. |
| VIF_DIFFLANG | The new and preexisting files have different language or code-page values. This error can be overridden by calling VerInstallFile again with the VIFF_FORCEINSTALL flag set. |
| VIF_DIFFCODEPG | The new file requires a code page that cannot be displayed by the version of Windows currently running. This error can be overridden by calling VerInstallFile with the VIFF_FORCEINSTALL flag set. |
| VIF_DIFFTYPE | The new file has a different type, subtype, or operating system from the preexisting file. This error can be overridden by calling VerInstallFile again with the VIFF_FORCEINSTALL flag set. |
| VIF_WRITEPROT | The preexisting file is write protected. This error can be overridden by calling VerInstallFile again with the VIFF_FORCEINSTALL flag set. |
| VIF_FILEINUSE | The preexisting file is in use by Windows and cannot be deleted. |
| VIF_OUTOFSPACE | The function cannot create the temporary file due to insufficient disk space on the destination drive. |
| VIF_ACCESSVIOLATION | A read, create, delete, or rename operation failed due to an access violation. |
| VIF_SHARINGVIOLATION | A read, create, delete, or rename operation failed due to a sharing violation. |
| VIF_CANNOTCREATE | The function cannot create the temporary file. The specific error may be described by another flag. |
| VIF_CANNOTDELETE | The function cannot delete the destination file, or cannot delete the existing version of the file located in another directory. If the VIF_TEMPFILE bit is set, the installation failed, and the destination file probably cannot be deleted. |
| VIF_CANNOTDELETECUR | The existing version of the file could not be deleted and VIFF_DONTDELETEOLD was not specified. |
| VIF_CANNOTRENAME | The function cannot rename the temporary file, but already deleted the destination file. |
| VIF_OUTOFMEMORY | The function cannot complete the requested operation due to insufficient memory. Generally, this means the application ran out of memory attempting to expand a compressed file. |
| VIF_CANNOTREADSRC | The function cannot read the source file. This could mean that the path was not specified properly. |
| VIF_CANNOTREADDST | The function cannot read the destination (existing) files. This prevents the function from examining the file's attributes. |
| VIF_BUFFTOOSMALL | The szTmpFile buffer was too small to contain the name of the temporary source file. When the function returns, lpuTmpFileLen contains the size of the buffer required to hold the filename. |
All other values are reserved.
Remarks
VerInstallFile copies the file from the source directory to the destination directory. If szCurDir indicates that a previous version of the file exists on the system, VerInstallFile compares the files' version stamp information. If the previously installed version of the file is more recent than the new version, or if the files' attributes are significantly different, for example, if they are in different languages, then VerInstallFile returns with one or more recoverable error codes.
VerInstallFile leaves the temporary file in the destination directory. The application can either override the error or delete the temporary file. If the application overrides the error, VerInstallFile deletes the previously installed version and renames the temporary file with the original filename.
See Also