Print Page - how do i load an Image File that isn't a resource ?

Title: how do i load an Image File that isn't a resource ?
Post by: Rainstorm on November 10, 2008, 09:58:48 AM

how do i access an image that isn't a resource ? (like jpg png gif files etc) while the program is running - some programs give you a browse dialog where you can choose an image & after its loaded it can be used by the program in someway. -I did some quick searching in the SDK but the functions seem to refer to loading images in the form of resources which are in an .exe (LoadImage can't do this can it ? - still figuring out all that that function is capable of doing)

= = = = = = = =
Also how does MAKEINTRESOURCE do what it does ?, just looking to duplicate that in asm.
from the SDK..

QuoteThe MAKEINTRESOURCE macro converts an integer value to a resource type compatible with the resource-management functions. This macro is used in place of a string containing the name of the resource.

many thanks.

Title: Re: how do i load an Image File that isn't a resource ?
Post by: MichaelW on November 10, 2008, 10:54:32 AM

For a bitmap file you can use LoadImage (http://msdn.microsoft.com/en-us/library/ms648045.aspx), something like this:

Code Select


invoke LoadImage, NULL, chr$("sample.bmp"),
                 IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE
mov hbmp, eax

I think GDI+ has a function that can handle a variety of image formats, and I think there was a recent thread that discussed this.

I think MAKEINTRESOURCE just basically casts a 16-bit word to a string pointer, to make it acceptable to the compiler as a parameter to the resource-related functions that expect a resource identifier. Because of the format, where the low-order word contains the identifier and the high-order word contains 0, the functions are able to recognize that the identifier is an image ordinal instead of a pointer to an image name. For asm code, you just need to make sure that the identifier is either a pointer to a valid resource name (or filename for LoadImage and LR_LOADFROMFILE) or a value < 65536.

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#define MAKEINTRESOURCEA(i) (LPSTR)((ULONG_PTR)((WORD)(i)))
#define MAKEINTRESOURCEW(i) (LPWSTR)((ULONG_PTR)((WORD)(i)))

Title: Re: how do i load an Image File that isn't a resource ?
Post by: donkey on November 10, 2008, 10:59:52 AM

You would use GetOpenFileName (http://msdn.microsoft.com/en-us/library/ms646927.aspx) to get a file name (or supply one hard coded in your program) then use LoadImage (http://msdn.microsoft.com/en-us/library/ms648045.aspx) with the LR_LOADFROMFILE flag...

Code Select

invoke LoadImage,NULL,offset FilePath,IMAGE_BITMAP,0,0,LR_LOADFROMFILE or LR_CREATEDIBSECTION

[edit] Cross posted with MichaelW - pretty much the same info here [/edit]

Title: Re: how do i load an Image File that isn't a resource ?
Post by: Rainstorm on November 11, 2008, 08:53:08 AM

Michael, Donkey.. thanks a lot for the explanation & sample code.

what does an OEM image refer to actually ?

Title: Re: how do i load an Image File that isn't a resource ?
Post by: gwapo on November 11, 2008, 01:11:02 PM

Quote from: Rainstorm on November 11, 2008, 08:53:08 AM
what does an OEM image refer to actually ?

These are public images defined in your system. In C header, you can find them in penwin.h file.

#define OBM_SKBBTNUP 32767
#define OBM_SKBBTNDOWN 32766
#define OBM_SKBBTNDISABLED 32765

#define OBM_ZENBTNUP 32764
#define OBM_ZENBTNDOWN 32763
#define OBM_ZENBTNDISABLED 32762

#define OBM_HANBTNUP 32761
#define OBM_HANBTNDOWN 32760
#define OBM_HANBTNDISABLED 32759

#define OBM_KKCBTNUP 32758
#define OBM_KKCBTNDOWN 32757
#define OBM_KKCBTNDISABLED 32756

#define OBM_SIPBTNUP 32755
#define OBM_SIPBTNDOWN 32754
#define OBM_SIPBTNDISABLED 32753

#define OBM_PTYBTNUP 32752
#define OBM_PTYBTNDOWN 32751
#define OBM_PTYBTNDISABLED 32750

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; load disabled button image from system resource
invoke LoadImage, NULL, OBM_PTYBTNDISABLED, IMAGE_BITMAP, NULL, NULL, LR_DEFAULTSIZE or LR_LOADTRANSPARENT

\

-chris

Title: Re: how do i load an Image File that isn't a resource ?
Post by: Farabi on November 11, 2008, 01:23:10 PM

Oh yeah, a few years ago there are some bug at the loadimage function. If you encounter that problem, tell me.

Title: Re: how do i load an Image File that isn't a resource ?
Post by: Vortex on November 11, 2008, 07:04:44 PM

Hi Rainstorm,

You can have a look at the showdib example coming with the Masm32 package :

Code Select

\masm32\examples\exampl02\showdib

It displays a dialog box to select a bitmap image.

Here are two examples. The first one loads and displays a bitmap from memory. The second one, the GDI+ demo loads a bitmap from file and converts it to jpg.

With a little effort, the GDI+ demo can be modified to load png and gif images.

[attachment deleted by admin]

Title: Re: how do i load an Image File that isn't a resource ?
Post by: Rainstorm on November 13, 2008, 01:47:45 PM

Vortex, thanks a lot, for the examples - just dloaded them & having a look

chris, got it!! - t y : )

Title: Re: how do i load an Image File that isn't a resource ?
Post by: Vortex on November 13, 2008, 07:57:43 PM

Hi Rainstorm,

A note about GDI+ :

QuoteThe graphics file formats supported by GDI+ are BMP, GIF, JPEG, PNG, TIFF, Exif, WMF, and EMF.

Not to forget, there are also the image functions from masm32.lib :

Code Select


BitmapFromFile 
BitmapFromResource 
BitmapFromMemory

Title: Re: how do i load an Image File that isn't a resource ?
Post by: Rainstorm on November 13, 2008, 10:00:53 PM

vortex, thanks for the Alert, & for the function references,.. was really helpfull ! :thumbu

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General Forums => The Campus => Topic started by: Rainstorm on November 10, 2008, 09:58:48 AM