Function (WIMGetMountedImageInfo)

[SlpLow]

Hallo! Hilfe bitte!
Warum function (WIMGetMountedImageInfo) nicht an zwei montierten Bildern zu arbeiten?

Delphi-Quellcode:

procedure TForm1.btn2Click(Sender: TObject);
var
  Created, Count: DWORD;
  Buffer: WIM_MOUNT_INFO_LEVEL0;
  size: Integer;
  wPath, wFile, wIndex, wWrite: string;
begin
  if not (WIMGetMountedImageInfo(0, @Count, @Buffer, size, @created)) then
  begin
    ShowMessage('Error Open ' + IntToStr(GetLastError));
    Exit;
  end
  else
  begin 
    if Count > 0 then
    begin
//      for i := 1 to Count - 1 do
      begin
        wPath := Buffer.MountPath;
        wFile := Buffer.WimPath;
        wIndex := IntToStr(Buffer.ImageIndex);
        // Memo1.Lines.Add(BoolToStr(NewInfoBuf.MountedForRW, true));
        if Buffer.MountedForRW then
          wWrite := 'RW'
        else
          wWrite := 'R';
      end;
      Memo1.Lines.Add(wPath);
      Memo1.Lines.Add(wFile);
      Memo1.Lines.Add(wIndex);
      Memo1.Lines.Add(wWrite);
    end;
end;

[Union]

See the documentation

[SlpLow]

Zitat:

Zitat von Union (Beitrag 1240017)

See the documentation

Thank you! I studied it for three days.
When one image, everything works. If two simultaneously in different folders is not running. It is clear that there are many records but how to handle it I do not know.

[himitsu]

Then you did not read properly.

Zitat:

pMountInfo

[out opt] Pointer to a variable that receives the array of mounted image structures. The size of the information written varies depending on the type of structured defined by the fInfoLevelId parameter.

cbMountInfoLength

[in] The size of the buffer pointed to by the pMountInfo parameter, in bytes.

pcbReturnLength ( @created ? )

[out] A pointer to a variable in which the function returns the size of the requested information. If ...

[SlpLow]

I can tell you one thing! I do not know how to do, how to announce in the variables and how to apply.
Is all that is understood.

Delphi-Quellcode:

 if not (WIMGetMountedImageInfo([COLOR="Red"]MountedImageInfoLevel0[/COLOR], @Count, @Buffer, size, @created)) then

Yours!

[SlpLow]

I can tell you one thing! I do not know how to do, how to announce in the variables and how to apply.
Is all that is understood - MountedImageInfoLevel0.

Delphi-Quellcode:

 if not (WIMGetMountedImageInfo(MountedImageInfoLevel0, @Count, @Buffer, size, @created)) then

Yours!

[Zacherl]

Zitat:

Zitat von SlpLow (Beitrag 1240032)

When one image, everything works

I doubt that ... :roll:

You were just "lucky". The uninitialized size variable contained a sufficient size for the returned data struct. The api call in it's current form destroys a random memory region (directly behind the output buffer) in your program (buffer overflow), if there is more than one mounted image.

I cant really test it, because i have no mounted images, but it should work like this. Happy copy and paste:

Delphi-Quellcode:

type
  _WIM_MOUNT_LIST = packed record
    WimPath: array[0..MAX_PATH - 1] of WideChar;
    MountPath: array[0..MAX_PATH - 1] of WideChar;
    ImageIndex: DWord;
    MountedForRW: BOOL;
  end;
  WIM_MOUNT_LIST = _WIM_MOUNT_LIST;
  PWIM_MOUNT_LIST = ^WIM_MOUNT_LIST;
type
  WIM_MOUNT_INFO_LEVEL0 = _WIM_MOUNT_LIST;
  PWIM_MOUNT_INFO_LEVEL0 = ^WIM_MOUNT_LIST;
type
  MOUNTED_IMAGE_INFO_LEVELS = DWord;
const
  MountedImageInfoLevel0 = 1;
var
  WIMGetMountedImageInfo: function(fInfoLevelId: MOUNTED_IMAGE_INFO_LEVELS;
    var dwImageCount: DWord; pMountInfo: Pointer; cbMountInfoLength: DWord;
    var cbReturnLength: DWord): BOOL; stdcall;
type
  PWIM_MOUNT_INFO_LEVEL0_LIST = ^WIM_MOUNT_INFO_LEVEL0_LIST;
  WIM_MOUNT_INFO_LEVEL0_LIST = array[0..0] of WIM_MOUNT_INFO_LEVEL0;
var
  Success: Boolean;
  Buffer: PWIM_MOUNT_INFO_LEVEL0_LIST;
  BufferLength,
  ReturnLength,
  ImageCount: DWord;
  I: Integer;
begin
  @WIMGetMountedImageInfo := GetProcAddress(LoadLibrary('wimgapi.dll'), 'WIMGetMountedImageInfo');
  BufferLength := SizeOf(WIM_MOUNT_INFO_LEVEL0) * 8;
  GetMem(Buffer, BufferLength);
  try
    repeat
      Success := WIMGetMountedImageInfo(MountedImageInfoLevel0, ImageCount, Buffer, BufferLength,
        ReturnLength);
      if (Success) then
      begin
        for I := 0 to ImageCount - 1 do
        begin
          ShowMessage(StrPas(PChar(@Buffer^[I].WimPath[0])));
        end;
      end else if (GetLastError = ERROR_INSUFFICIENT_BUFFER) then
      begin
        ReallocMem(Buffer, ReturnLength);
      end;
    until (Success) or (GetLastError <> ERROR_INSUFFICIENT_BUFFER);
  finally
    FreeMem(Buffer);
  end;
end;

[SlpLow]

Zacherl! Vielen, vielen Dank! Ich werde versuchen, zu verstehen.
Adel liegt (sitzt) im Gemüte, nicht im Geblüte.

himitsu! Danke! Ich habe wenig Erfahrung, aber ich werde lernen!

[SlpLow]

Thank you again!
Strings and integer okay!
A logical always returns a -1 (RW, R) instead of 0 and 1

Delphi-Quellcode:

Idx: = BoolToStr (Buffer ^ [I]. MountedForRW, False);

:
or integer 257 (RW) or 1 (R) instead of 0 and 1

Delphi-Quellcode:

idx: = IntToStr (Integer (Buffer ^ [I]. MountedForRW));

:
Because it LongBool? Is there a solution?

I do not know, correct or not, but the problem disappeared when

Delphi-Quellcode:

const
MountedImageInfoLevel0 = 0;

Is it right decision?

[Zacherl]

Thats because of the C style boolean definition:
FALSE = 0
TRUE = everything else

You can just check the flag like this:

Delphi-Quellcode:

if (Buffer^[I].MountedForRW) then

or

Delphi-Quellcode:

if (not Buffer^[I].MountedForRW) then

If your problem is just the bool to string conversion you can go for this:

Delphi-Quellcode:

BoolToStr(Buffer^[I].MountedForRW, true)

or just write you an own function, if you dont like the -1 or the default bool strings.