Sign in to follow this  
Followers 0
myspacee

convert png to jpg resizing

2 posts in this topic

Hello to all,

use GDI to convert an image to another (png -> jpg) :

#include <GDIPlus.au3>


_Main()

Func _Main()
    Local $hBitmap, $hImage, $sCLSID, $tData, $tParams


    ; Initialize GDI+ library
    _GDIPlus_Startup ()

    ; Load image
    $hImage = _GDIPlus_ImageLoadFromFile ("01.png")

    ; Get JPEG encoder CLSID
    $sCLSID = _GDIPlus_EncodersGetCLSID ("JPG")

    ; Save image with rotation
    _GDIPlus_ImageSaveToFileEx ($hImage, "01.jpg", $sCLSID, DllStructGetPtr($tParams))



    ; Shut down GDI+ library
    _GDIPlus_ShutDown ()

EndFunc   ;==>_Main

Read about _GDIPlus_GraphicsDrawImage that allow to draw an Image object,

and think to use to resize obtained .jpg. But can't understand how use it ...

Anyone can help me in this GDI convert&resing thing ?

Thank you for your time,

m.

Share this post


Link to post
Share on other sites



some step done,

but not final, don't understand use of _GDIPlus_GraphicsDrawImageRectRect for :

$iSrcX The X coordinate of the upper left corner of the source image 
$iSrcY The Y coordinate of the upper left corner of the source image

update code:

#include <GDIPlus.au3>

global $my_Width = 500, $my_Height = 500
dim $local_file = "01.png"


_Main()

Func _Main()
    Local $hBitmap, $hImage, $sCLSID, $tData, $tParams


    ; Initialize GDI+ library
    _GDIPlus_Startup ()

    ; Load image
    $hImage = _GDIPlus_ImageLoadFromFile ($local_file)

    ; Get JPEG encoder CLSID
    $sCLSID = _GDIPlus_EncodersGetCLSID ("JPG")

    ; Save image with rotation
    _GDIPlus_ImageSaveToFileEx ($hImage, "01.jpg", $sCLSID, DllStructGetPtr($tParams))


    ; Shut down GDI+ library
    _GDIPlus_ShutDown ()

    _resizeME($my_Width, $my_Height)


EndFunc   ;==>_Main



Func _resizeME($my_Width, $my_Height)
    
    local $hBMP
    ;Start up GDIPlus
    _GDIPlus_Startup ()

    ;Create canvas to put the resized image onto
    ;$hBMP = _CreateBitmap($oSize[1], $oSize[2])
    $hBMP = _CreateBitmap($my_Width, $my_Height)
    $hImage1 = _GDIPlus_BitmapCreateFromHBITMAP($hBMP)

    ;Load an image file that you want to resize
    $hImage2 = _GDIPlus_ImageLoadFromFile("01.jpg")
    $hGraphics = _GDIPlus_ImageGetGraphicsContext($hImage1)

    ;Put 2nd image onto the canvas at the desired size
     _GDIPlus_GraphicsDrawImageRectRect($hGraphics, $hImage2, 0, 0, 1000, 1000, 0, 0, $my_Width, $my_Height)
    ;=====================================   ERROR HERE ============^^^^==^^^^==============================

    ;The encoder to use for the output image
    $CLSID = _GDIPlus_EncodersGetCLSID("JPG")

    ;Save the new resized image to a file
    ;~ _GDIPlus_ImageSaveToFileEx($hImage1, '"' & $sPath & "cool." & '"'  & StringLower($Ext), $CLSID)
    _GDIPlus_ImageSaveToFileEx($hImage1,"_01.jpg", $CLSID)

    ;Clean up resources
    _GDIPlus_ImageDispose($hImage1)
    _GDIPlus_ImageDispose($hImage2)
    _GDIPlus_GraphicsDispose($hGraphics)
    _WinAPI_DeleteObject($hBMP)

    ;Shut down GDIPlus
    _GDIPlus_Shutdown()

EndFunc   ;==>_Main


Func _CreateBitmap($iW, $iH)
    Local $hWnd, $hDDC, $hCDC, $hBMP
    $hWnd = _WinAPI_GetDesktopWindow()
    $hDDC = _WinAPI_GetDC($hWnd)
    $hCDC = _WinAPI_CreateCompatibleDC($hDDC)
    $hBMP = _WinAPI_CreateCompatibleBitmap($hDDC, $iW, $iH)
    _WinAPI_ReleaseDC($hWnd, $hDDC)
    _WinAPI_DeleteDC($hCDC)
    Return $hBMP
EndFunc  ;==>_CreateBitmap

anyone correct me please ?

m.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0