Hi,
When i try to compile "Developer's Image Library" (http://www.imagelib.org)
i get stuck on this define statements (and similar ones).

Error message is "alignment must be a power of 2" and a warning "unrecognized pragma"

#ifdef _WIN32
#pragma pack(push, bmp_struct, 1)
#endif
typedef struct BMPHEAD
{
ILushort	bfType;
ILint		bfSize;
ILuint		bfReserved;
ILint		bfDataOff;
ILint		biSize;
ILint		biWidth;
ILint		biHeight;
ILshort		biPlanes;
ILshort		biBitCount;
ILint		biCompression;
ILint		biSizeImage;
ILint		biXPelsPerMeter;
ILint		biYPelsPerMeter;
ILint		biClrUsed;
ILint		biClrImportant;
} IL_PACKSTRUCT BMPHEAD;

typedef struct OS2_HEAD
{
// Bitmap file header.
ILushort	bfType;
ILuint		biSize;
ILshort		xHotspot;
ILshort		yHotspot;
ILuint		DataOff;

// Bitmap info header.
ILuint		cbFix;
ILuint		cx;
ILuint		cy;
ILushort	cPlanes;
ILushort	cBitCount;
/*ILuint		ulCompression;
ILuint		cbImage;
ILuint		cxResolution;
ILuint		cyResolution;
ILuint		cclrUsed;
ILuint		cclrImportant;
ILushort	usUnits;
ILushort	usReserved;
ILushort	usRecording;
ILushort	usRendering;
ILuint		cSize1;
ILuint		cSize2;
ILuint		ulColorEncoding;
ILuint		ulIdentifier;*/
} IL_PACKSTRUCT OS2_HEAD;
#ifdef _WIN32
#pragma pack(pop, bmp_struct)
#endif

/Mikael

<mikaelh@delphi.se> wrote in message news:aguh0h$1n74$1@digitaldaemon.com...
> Hi,
> When i try to compile "Developer's Image Library"
(http://www.imagelib.org)
> i get stuck on this define statements (and similar ones).
>
> Error message is "alignment must be a power of 2" and a warning "unrecognized pragma"
>
> #ifdef _WIN32
> #pragma pack(push, bmp_struct, 1)
> #endif

What alignment are you setting it to?

>
>What alignment are you setting it to?
>
>

Sorry, I'm all lost now. I have never using these options before.
But I found something under Settings/Build/Struct Alignment
which are set to quad word, and tested all other options but it gave
not better results.

<mikaelh@delphi.se> wrote in message news:agutk0$25at$1@digitaldaemon.com...
> >
> >What alignment are you setting it to?
> Sorry, I'm all lost now. I have never using these options before.
> But I found something under Settings/Build/Struct Alignment
> which are set to quad word, and tested all other options but it gave
> not better results.

The #pragma pack is used to set the alignment within the source code. Your code passes it a macro or something, what value does that expand to? (The value needs to be a power of 2.)

>
>The #pragma pack is used to set the alignment within the source code. Your code passes it a macro or something, what value does that expand to? (The value needs to be a power of 2.)

If i undestand the help file right it must be 1 in this line below?
#pragma pack(push, bmp_struct, 1)

I tried them all (2,4,8,16)

On Mon, 15 Jul 2002 10:46:25 -0700, Walter wrote:
[ #pragma pack(push, bmp_struct, 1) ]
> The #pragma pack is used to set the alignment within the source code. Your code passes it a macro or something, what value does that expand to? (The value needs to be a power of 2.)

I guess DM doesn't correctly understand the "Visual C++" extensions of the pack pragma. "bmp_struct" is an identifier for the "pragma pack" stack and the alignment is 1. (see http://msdn.microsoft.com/library/en-us/vclang/html/_PREDIR_pack.asp)


bye, Christof

-- 
http://cmeerw.org                                 JID: cmeerw@jabber.at mailto cmeerw at web.de

...and what have you contributed to the Net?

"Christof Meerwald" <cmeerw@web.de> wrote in message news:agv657$2drp$1@digitaldaemon.com...
> On Mon, 15 Jul 2002 10:46:25 -0700, Walter wrote:
> [ #pragma pack(push, bmp_struct, 1) ]
> > The #pragma pack is used to set the alignment within the source code.
Your
> > code passes it a macro or something, what value does that expand to?
(The
> > value needs to be a power of 2.)
>
> I guess DM doesn't correctly understand the "Visual C++" extensions of the pack pragma. "bmp_struct" is an identifier for the "pragma pack" stack and the alignment is 1. (see http://msdn.microsoft.com/library/en-us/vclang/html/_PREDIR_pack.asp)

Thanks for the reference. More accurately, MS changed it from what it was
before. In any case, replacing it with:
    #pragma pack(push, 1)
should work.