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9464 :: question on use GUIPlus on windows 10 64bits

• oyster (orginal) [2022-09-14T04:26:30+02:00] view original

  Since I can't recall any image library binding for nim which can read image file, write image file, resize image, and read pixel colors - correct me if I am wrong, and I don't think huge OpenCV is a good choice, I think maybe I could use GDIPlus on my windows 10 64bits.

  khchen has supplied a binding as https://github.com/khchen/winim/blob/master/winim/inc/gdiplus.nim

  the first step is initilization and exit.

  
  proc GdiplusStartup*(token: ptr ULONG_PTR, input: ptr GdiplusStartupInput, output: ptr GdiplusStartupOutput): GpStatus {.winapi, stdcall, dynlib: "gdiplus", importc.}
  
  proc GdiplusShutdown*(token: ULONG_PTR): VOID {.winapi, stdcall, dynlib: "gdiplus", importc.}
  Run

  so I write the code

  import winim
  
  var
      token: ULONG_PTR
      input: GdiplusStartupInput
      output: GdiplusStartupOutput
      status: GpStatus
  
  status = GdiplusStartup(&token, &input, &output)
  echo status
  Run

  which shows 17 which means UnsupportedGdiplusVersion according to https://docs.microsoft.com/en-us/windows/win32/api/gdiplustypes/ne-gdiplustypes-status

  what is the problem?

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• oyster (orginal) [2022-09-14T04:29:03+02:00] view original

  then the following code gets wrong of cause

  var img: ptr GpImage
  status = GdipLoadImageFromFile(L"a.png", &img);
  echo status
  Run

  which says 18 ( GdiplusNotInitialized).

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• ElegantBeef (orginal) [2022-09-14T04:50:11+02:00] view original

  Perhaps instead of a binding, the native nim Pixie library can help you.

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• Ward (orginal) [2022-09-14T05:38:44+02:00] view original

  I use gdiplus to deal image in wNim/wImage. You can look at it.

  https://github.com/khchen/wNim/blob/master/wNim/private/wImage.nim

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• oyster (orginal) [2022-09-16T13:43:58+02:00] view original

  so bad, I met the similar problem stated in https://github.com/treeform/pixie/issues/503

  I think it is better for me not to use https://github.com/treeform/pixie in real project at least for now, but take a glimpse from time to time.

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• oyster (orginal) [2022-09-16T15:03:04+02:00] view original

  I read something in https://github.com/khchen/wNim/blob/master/wNim/private/wImage.nim like

  var
      width1, height1, width2, height2: int32
  Run

  then

  if GdipGetImageWidth(gdipbmp1, cast[ptr UINT](&width1)) != Ok: return false
  Run

  could it be better to write only int32 or UINT?

  I know nothing about the underneath windows API since I am not a professional programmer, and for most of the time I use python.

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• oyster (orginal) [2022-09-16T17:40:14+02:00] view original

  I think it could be better if pixie only focuses on other functions but uses external jpg/png/other loading/saving lib.

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• oyster (orginal) [2022-09-17T07:39:38+02:00] view original

  [fileformats] 109,812 [fontformats] 85,772 [simd] 72,042 blends.nim 11,025 common.nim 2,987 contexts.nim 26,903 fonts.nim 23,257 images.nim 26,271 internal.nim 3,507 paints.nim 8,065 paths.nim 69,645 simd.nim 598

  Run

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• Ward (orginal) [2022-09-18T08:13:54+02:00] view original

  I think the answer is yes. The base type of UINT is int32 in winim. And the prototype of GdipGetImageWidth is:

  proc GdipGetImageWidth*(image: ptr GpImage, width: ptr UINT): GpStatus
  Run

  So following code should be work, too.

  var width1: int32
  if GdipGetImageWidth(gdipbmp1, &width1) != Ok: return false
  Run

  I already forget why I add a cast here. Maybe width was int at first, so it needed the cast, and then I modified the int to int32 and forgot to remove the cast.

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