Question:
How do I get the version information for a file?
Answer:
In order to get the file version information for a file you
have to make several API calls. Here is an example
that checks your version of shell32.dll and returns True if
it is greater than or equal to 4.71.
function TForm1.CheckShell32Version: Boolean;
procedure GetFileVersion(FileName: string; var Major1, Major2,
Minor1, Minor2: Integer);
{ Helper function to get the actual file version information }
var
Info: Pointer;
InfoSize: DWORD;
FileInfo: PVSFixedFileInfo;
FileInfoSize: DWORD;
Tmp: DWORD;
begin
// Get the size of the FileVersionInformatioin
InfoSize := GetFileVersionInfoSize(PChar(FileName), Tmp);
// If InfoSize = 0, then the file may not exist, or
// it may not have file version information in it.
if InfoSize = 0 then
raise Exception.Create('Can''t get file version information for '
+ FileName);
// Allocate memory for the file version information
GetMem(Info, InfoSize);
try
// Get the information
GetFileVersionInfo(PChar(FileName), 0, InfoSize, Info);
// Query the information for the version
VerQueryValue(Info, '\', Pointer(FileInfo), FileInfoSize);
// Now fill in the version information
Major1 := FileInfo.dwFileVersionMS shr 16;
Major2 := FileInfo.dwFileVersionMS and $FFFF;
Minor1 := FileInfo.dwFileVersionLS shr 16;
Minor2 := FileInfo.dwFileVersionLS and $FFFF;
finally
FreeMem(Info, FileInfoSize);
end;
end;
var
tmpBuffer: PChar;
Shell32Path: string;
VersionMajor: Integer;
VersionMinor: Integer;
Blank: Integer;
begin
tmpBuffer := AllocMem(MAX_PATH);
// Get the shell32.dll path
try
GetSystemDirectory(tmpBuffer, MAX_PATH);
Shell32Path := tmpBuffer + '\shell32.dll';
finally
FreeMem(tmpBuffer);
end;
// Check to see if it exists
if FileExists(Shell32Path) then
begin
// Get the file version
GetFileVersion(Shell32Path, VersionMajor, VersionMinor, Blank, Blank);
// Do something, such as require a certain version
// (such as greater than 4.71)
if (VersionMajor >= 4) and (VersionMinor >= 71) then
Result := True
else
Result := False;
end
else
Result := False;
end;