DllstructGetData doesn't match the struct definition names

[frank10]

I have this C++ struct:

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;~ typedef struct _IplImage {
;~ 00132     int  nSize;         /*< sizeof(IplImage) */
;~ 00133     int  ID;           /*< version (=0)*/
;~ 00134     int  nChannels;     /*< Most of OpenCV functions support 1,2,3 or 4 channels */
;~ 00135     int  alphaChannel;  /*< ignored by OpenCV */
;~ 00136     int  depth;         /*< pixel depth in bits: IPL_DEPTH_8U, IPL_DEPTH_8S, IPL_DEPTH_16S,
;~ 00137                           IPL_DEPTH_32S, IPL_DEPTH_32F and IPL_DEPTH_64F are supported */
;~ 00138     char colorModel[4]; /*< ignored by OpenCV */
;~ 00139     char channelSeq[4]; /*< ignored by OpenCV */
;~ 00140     int  dataOrder;     /*< 0 - interleaved color channels, 1 - separate color channels.
;~ 00141                           cvCreateImage can only create interleaved images */
;~ 00142     int  origin;       /*< 0 - top-left origin,
;~ 00143                           1 - bottom-left origin (Windows bitmaps style) */
;~ 00144     int  align;         /*< Alignment of image rows (4 or 8).
;~ 00145                           OpenCV ignores it and uses widthStep instead */
;~ 00146     int  width;         /*< image width in pixels */
;~ 00147     int  height;       /*< image height in pixels */
;~ 00148     struct _IplROI *roi;/*< image ROI. if NULL, the whole image is selected */
;~ 00149     struct _IplImage *maskROI; /*< must be NULL */
;~ 00150     void  *imageId;     /*< must be NULL */
;~ 00151     struct _IplTileInfo *tileInfo; /*< must be null */
;~ 00152     int  imageSize;     /*< image data size in bytes
;~ 00153                           (==image->height*image->widthStep
;~ 00154                           in case of interleaved data)*/
;~ 00155     char *imageData;  /*< pointer to aligned image data */
;~ 00156     int  widthStep;   /*< size of aligned image row in bytes */
;~ 00157     int  BorderMode[4]; /*< ignored by OpenCV */
;~ 00158     int  BorderConst[4]; /* ignored by OpenCV */
;~ 00159     char *imageDataOrigin; /*< pointer to very origin of image data
;~ 00160                              (not necessarily aligned) -
;~ 00161                              needed for correct deallocation */

with ImageData defined as:
;~ public:
;~ ImageData(
;~  array<unsigned char>^ bytes
;~ )
and roi:
typedef struct _IplROI
{
    int  coi; /* 0 - no COI (all channels are selected), 1 - 0th channel is selected ...*/
    int  xOffset;
    int  yOffset;
    int  width;
    int  height;
}

I tried to translate this to Autoit:

global $_roi = 'LONG xOffset;' & _
    'LONG yOffset;' & _
    'LONG width;' & _
    'LONG height;'

global $_IplImage = 'int  nSize;' & _
    'int  ID;' & _
    'int  nChannels;' & _
    'int  alphaChannel;' & _
    'int  depth;' & _
    'char colorModel[4];' & _
    'char channelSeq[4];' & _
    'int  dataOrder;' & _
    'int  origin;' & _
    'int align;' & _
    'int  width;' & _
    'int  height;' & _
    $_roi & _
    'int  imageSize;' & _
    'ptr imageData;' & _
    'int  widthStep;' & _
    'int BorderMode[4];' & _
    'int  BorderConst[4];' & _
    'ptr imageDataOrigin;'

Global $tIplImage = DllStructCreate($_IplImage, $returnedPointer)

I had to eliminate some voices in the original struct (such as align, maskROI, tileInfo) to get a correct corrispondence value in calling

DllStructGetData($tIplImage, 'someNamedItem')

Besides I had to delete one line from roi struct (I deleted the first 'coi') even if it's defined with coi...

If I leave all as the definition, I get wrong values from DllStructGetData.

All of this, with trial & error, but is there a precise rule to make the correct translation to an autoit struct in a case like this? Or the only one is to print values from a C++ prog and then try at guess to match it in autoit?

Furthermore, if I want to get the height value, it gives me the root-struct one, but if I would like to get the roi->height one (they have the same name)?

[ProgAndy]

Hi,

roi and maskROI are pointers to structures and no inline structures.

...
int  height;
ptr roi;
ptr maskROI;
ptr imageId;
ptr tileInfo;
int  imageSize;  
...

[frank10]

Thank you ProgAndy, you're right, they are pointers.

It works now.