Memoryfile

[Helper]

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 26/09/2011 at 12:28, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   12/13 
Platform:   Windows  ;   Mac OSX  ; 
Language(s) :     C++  ;

---------
Hi,

I have a base bitmap (jpeg) and a valid pointer to the memory to store.
How would one use "MemoryFileStruct" and "SetMemoryWriteMode" or should this be done differently?

Jan

[Helper]

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 27/09/2011 at 06:00, xxxxxxxx wrote:

The MemoryFileStruct class is is only used to write/read to memory instead of files. It basically replaces a filename.

here an example that writes a line of characters and prints the retrieved data.

  
Bool MenuTest::Execute(BaseDocument *doc)  
{  
  AutoAlloc<MemoryFileStruct> mfs;  
  if (!mfs) return FALSE;  
  
  Filename fn;  
  fn.SetMemoryWriteMode(mfs);  
  
  AutoAlloc<BaseFile> file;  
  if (!file) return FALSE;  
  
  if (!file->Open(fn, FILEOPEN_WRITE, FILEDIALOG_IGNOREOPEN, BYTEORDER_INTEL)) return FALSE;  
  
  CHAR *line = "hello world!";  
  
  //write something to the memory file  
  if (!file->WriteBytes(line, strlen(line))) return FALSE;  
  
  void *testline = NULL;  
  VLONG length = 0;  
  
  //get the written data  
  mfs->GetData(testline, length, FALSE);  
  
  if (!testline) return FALSE;  
  
  String str((CHAR* )testline);  
  
  GePrint(str);  
  
  return TRUE;  
}  

cheers,
Matthias

[Helper]

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 27/09/2011 at 08:55, xxxxxxxx wrote:

I see.
But my target is to save a freshly rendered preview in a base bitmap (jpeg) to an already initialized pointer in memory.
It seems to me that i cannot use the basefile in this case.

What are my options? What is possible?
I need to do this in realtime and as fast as possible. A preview is good enough.

1.Render directly in the memory already initialized?
2.Maybe by getting a handle to the jpeg data in the base bitmap? Can that be done?
3.Or a handle to the offscreen rendered preview? That is also a lot more efficient, because I would not need to force an extra render. .

Jan

[Helper]

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 28/09/2011 at 02:53, xxxxxxxx wrote:

Do you mean viewport rendering?

Anyways, saving a JPG to memory seems to work as follows:

  
Bool MenuTest::Execute(BaseDocument *doc)  
{  
  AutoAlloc<MemoryFileStruct> mfs;  
  if (!mfs) return FALSE;  
  
  Filename fn;  
  fn.SetMemoryWriteMode(mfs);  
  
  BaseBitmap *bmp = NULL;  
  bmp = BaseBitmap::Alloc();  
  if (!bmp) return FALSE;  
  
  BaseContainer bc;  
  bc.SetLong(JPGSAVER_QUALITY, 80);  
  
  void *mbmp = NULL;  
  VLONG length = 0;  
  
  if (bmp->Init(1024,512) != IMAGERESULT_OK) goto Error;  
  
  bmp->Clear(255,0,0);  
  
  if (bmp->Save(fn, FILTER_JPG, &bc, SAVEBIT_0) != IMAGERESULT_OK) goto Error;  
  
  GePrint("saved");  
  
  //get the written data  
  mfs->GetData(mbmp, length, FALSE);  
  if (!mbmp) goto Error;  
  
  // mbmp is the pointer to the JPG data  
  
  GePrint(LongToString(length));  
  
  return TRUE;  
  
Error:  
  BaseBitmap::Free(bmp);  
  return FALSE;  
}  

Hope that helps.

cheers,
Matthias