Mega Code Archive
Obtain dll-specific version information
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{***************************
** DllGetVersion Function **
***************************}
{
Implemented by many of the Microsoft® Windows® Shell dynamic-link libraries (DLLs) to
allow applications to obtain DLL-specific version information.
}
{
Using DllGetVersion to Determine the Version Number
Starting with version 4.71, the Shell and common controls DLLs, among others,
began exporting DllGetVersion.
This function can be called by an application to determine which DLL
version is present on the system. It returns a structure that contains version information.
Note DLLs do not necessarily export DllGetVersion. Always test for it
before attempting to use it.
For systems earlier than Windows 2000, DllGetVersion returns a DLLVERSIONINFO structure
that contains the major and minor version numbers, the build number,
and a platform identifier (ID).
For Windows 2000 and later systems, DllGetVersion might instead return a
DLLVERSIONINFO2 structure. This structure contains the QFE number that identifies
the service pack and provides a more robust way to compare version numbers than DLLVERSIONINFO.
Because the first member of DLLVERSIONINFO2 is a DLLVERSIONINFO structure,
the new structure is backward-compatible.
}
// DLLVERSIONINFO structure
type
PDLLVerInfo=^TDLLVersionInfo;
TDLLVersionInfo=Record
cbSize, // Size of the structure, in bytes.
dwMajorVersion, // Major version of the DLL
dwMinorVersion, // Minor version of the DLL
dwBuildNumber, // Build number of the DLL
dwPlatformID: DWord; // Identifies the platform for which the DLL was built
end;
var
DllGetVersion: function(dvi: PDLLVerInfo): PDLLVerInfo; stdcall;
function GetDllVersion(DllName: string; var DLLVersionInfo: TDLLVersionInfo): Boolean;
var
hInstDll: THandle;
p: pDLLVerInfo;
begin
Result := False;
// Get a handle to the DLL module.
// das Handle zum DLL Modul ermitteln.
hInstDll := LoadLibrary(PChar(DllName));
if (hInstDll = 0) then Exit;
// Return the address of the specified exported (DLL) function.
// Adresse der Dll-Funktion ermitteln
@DllGetVersion := GetProcAddress(hInstDll, 'DllGetVersion');
// If the handle is not valid, clean up an exit.
// Wenn das Handle ungültig ist, wird die Funktion verlassen
if (@DllGetVersion) = nil then
begin
FreeLibrary(hInstDll);
Exit;
end;
new(p);
try
ZeroMemory(p, SizeOf(p^));
p^.cbSize := SizeOf(p^);
// Call the DllGetVersion function
// Die DllGetVersion() Funktion aufrufen
DllGetVersion(p);
DLLVersionInfo.dwMajorVersion := p^.dwMajorVersion;
DLLVersionInfo.dwMinorVersion := p^.dwMinorVersion;
@DllGetVersion := nil;
Result := True;
finally
dispose(P);
end;
// Free the DLL module.
// Dll wieder freigeben.
FreeLibrary(hInstDll);
end;
// Example to get version info from comctl32.dll
// Beispiel, um von comctl32 Versions/Informationen zu erhalten
procedure TForm1.Button1Click(Sender: TObject);
var
DLLVersionInfo: TDLLVersionInfo;
begin
if not GetDllVersion('comctl32.dll',DLLVersionInfo) then
begin
DLLVersionInfo.dwMajorVersion := 4;
DLLVersionInfo.dwMinorVersion := 0;
end;
with DLLVersionInfo do
ShowMessage(Format('ComCtl Version: %d.%d / Build: %d',[dwMajorVersion, dwMinorVersion, dwBuildNumber]))
end;
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