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OCRwithUWP_API.ahk
176 lines (168 loc) · 8.19 KB
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OCRwithUWP_API.ahk
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; Optical character recognition (OCR) with UWP API
; https://www.autohotkey.com/boards/viewtopic.php?f=6&t=72674
/*
https://docs.microsoft.com/en-us/uwp/api/windows.media.ocr
API recognizes text in 2 ways.
1) By indicating the language directly
2) Takes the first from the list of installed languages by their priority and possibility for recognition.
msgbox % ocr("ShowAvailableLanguages") - shows this list (OCR will take the first language of it).
msgbox % ocr("test.jpg") - OCR will recognize with the language taken from the list.
msgbox % ocr("test.jpg", "en") - english.
msgbox % ocr("test.jpg", "ru")- russian.
2 languages simultaneously - no chance.
msgbox % ocr("ShowAvailableLanguages")
msgbox % ocr("test.jpg", "en")
msgbox % ocr("test.jpg", "ru")
msgbox % ocr("test.jpg")
ExitApp
*/
ocr(file, lang := "FirstFromAvailableLanguages"){
static OcrEngineStatics, OcrEngine, MaxDimension, LanguageFactory, Language, CurrentLanguage, BitmapDecoderStatics, GlobalizationPreferencesStatics
if (OcrEngineStatics = "")
{
CreateClass("Windows.Globalization.Language", ILanguageFactory := "{9B0252AC-0C27-44F8-B792-9793FB66C63E}", LanguageFactory)
CreateClass("Windows.Graphics.Imaging.BitmapDecoder", IBitmapDecoderStatics := "{438CCB26-BCEF-4E95-BAD6-23A822E58D01}", BitmapDecoderStatics)
CreateClass("Windows.Media.Ocr.OcrEngine", IOcrEngineStatics := "{5BFFA85A-3384-3540-9940-699120D428A8}", OcrEngineStatics)
DllCall(NumGet(NumGet(OcrEngineStatics+0)+6*A_PtrSize), "ptr", OcrEngineStatics, "uint*", MaxDimension) ; MaxImageDimension
}
if (file = "ShowAvailableLanguages")
{
if (GlobalizationPreferencesStatics = "")
CreateClass("Windows.System.UserProfile.GlobalizationPreferences", IGlobalizationPreferencesStatics := "{01BF4326-ED37-4E96-B0E9-C1340D1EA158}", GlobalizationPreferencesStatics)
DllCall(NumGet(NumGet(GlobalizationPreferencesStatics+0)+9*A_PtrSize), "ptr", GlobalizationPreferencesStatics, "ptr*", LanguageList) ; get_Languages
DllCall(NumGet(NumGet(LanguageList+0)+7*A_PtrSize), "ptr", LanguageList, "int*", count) ; count
loop % count
{
DllCall(NumGet(NumGet(LanguageList+0)+6*A_PtrSize), "ptr", LanguageList, "int", A_Index-1, "ptr*", hString) ; get_Item
DllCall(NumGet(NumGet(LanguageFactory+0)+6*A_PtrSize), "ptr", LanguageFactory, "ptr", hString, "ptr*", LanguageTest) ; CreateLanguage
DllCall(NumGet(NumGet(OcrEngineStatics+0)+8*A_PtrSize), "ptr", OcrEngineStatics, "ptr", LanguageTest, "int*", bool) ; IsLanguageSupported
if (bool = 1)
{
DllCall(NumGet(NumGet(LanguageTest+0)+6*A_PtrSize), "ptr", LanguageTest, "ptr*", hText)
buffer := DllCall("Combase.dll\WindowsGetStringRawBuffer", "ptr", hText, "uint*", length, "ptr")
text .= StrGet(buffer, "UTF-16") "`n"
}
ObjRelease(LanguageTest)
}
ObjRelease(LanguageList)
return text
}
if (lang != CurrentLanguage) or (lang = "FirstFromAvailableLanguages")
{
if (OcrEngine != "")
{
ObjRelease(OcrEngine)
if (CurrentLanguage != "FirstFromAvailableLanguages")
ObjRelease(Language)
}
if (lang = "FirstFromAvailableLanguages")
DllCall(NumGet(NumGet(OcrEngineStatics+0)+10*A_PtrSize), "ptr", OcrEngineStatics, "ptr*", OcrEngine) ; TryCreateFromUserProfileLanguages
else
{
CreateHString(lang, hString)
DllCall(NumGet(NumGet(LanguageFactory+0)+6*A_PtrSize), "ptr", LanguageFactory, "ptr", hString, "ptr*", Language) ; CreateLanguage
DeleteHString(hString)
DllCall(NumGet(NumGet(OcrEngineStatics+0)+9*A_PtrSize), "ptr", OcrEngineStatics, ptr, Language, "ptr*", OcrEngine) ; TryCreateFromLanguage
}
if (OcrEngine = 0)
{
msgbox Can not use language "%lang%" for OCR, please install language pack.
ExitApp
}
CurrentLanguage := lang
}
if (SubStr(file, 2, 1) != ":")
file := A_ScriptDir "\" file
if !FileExist(file) or InStr(FileExist(file), "D")
{
msgbox File "%file%" does not exist
ExitApp
}
VarSetCapacity(GUID, 16)
DllCall("ole32\CLSIDFromString", "wstr", IID_RandomAccessStream := "{905A0FE1-BC53-11DF-8C49-001E4FC686DA}", "ptr", &GUID)
DllCall("ShCore\CreateRandomAccessStreamOnFile", "wstr", file, "uint", Read := 0, "ptr", &GUID, "ptr*", IRandomAccessStream)
DllCall(NumGet(NumGet(BitmapDecoderStatics+0)+14*A_PtrSize), "ptr", BitmapDecoderStatics, "ptr", IRandomAccessStream, "ptr*", BitmapDecoder) ; CreateAsync
WaitForAsync(BitmapDecoder)
BitmapFrame := ComObjQuery(BitmapDecoder, IBitmapFrame := "{72A49A1C-8081-438D-91BC-94ECFC8185C6}")
DllCall(NumGet(NumGet(BitmapFrame+0)+12*A_PtrSize), "ptr", BitmapFrame, "uint*", width) ; get_PixelWidth
DllCall(NumGet(NumGet(BitmapFrame+0)+13*A_PtrSize), "ptr", BitmapFrame, "uint*", height) ; get_PixelHeight
if (width > MaxDimension) or (height > MaxDimension)
{
msgbox Image is to big - %width%x%height%.`nIt should be maximum - %MaxDimension% pixels
ExitApp
}
BitmapFrameWithSoftwareBitmap := ComObjQuery(BitmapDecoder, IBitmapFrameWithSoftwareBitmap := "{FE287C9A-420C-4963-87AD-691436E08383}")
DllCall(NumGet(NumGet(BitmapFrameWithSoftwareBitmap+0)+6*A_PtrSize), "ptr", BitmapFrameWithSoftwareBitmap, "ptr*", SoftwareBitmap) ; GetSoftwareBitmapAsync
WaitForAsync(SoftwareBitmap)
DllCall(NumGet(NumGet(OcrEngine+0)+6*A_PtrSize), "ptr", OcrEngine, ptr, SoftwareBitmap, "ptr*", OcrResult) ; RecognizeAsync
WaitForAsync(OcrResult)
DllCall(NumGet(NumGet(OcrResult+0)+6*A_PtrSize), "ptr", OcrResult, "ptr*", LinesList) ; get_Lines
DllCall(NumGet(NumGet(LinesList+0)+7*A_PtrSize), "ptr", LinesList, "int*", count) ; count
loop % count
{
DllCall(NumGet(NumGet(LinesList+0)+6*A_PtrSize), "ptr", LinesList, "int", A_Index-1, "ptr*", OcrLine)
DllCall(NumGet(NumGet(OcrLine+0)+7*A_PtrSize), "ptr", OcrLine, "ptr*", hText)
buffer := DllCall("Combase.dll\WindowsGetStringRawBuffer", "ptr", hText, "uint*", length, "ptr")
text .= StrGet(buffer, "UTF-16") "`n"
ObjRelease(OcrLine)
}
Close := ComObjQuery(IRandomAccessStream, IClosable := "{30D5A829-7FA4-4026-83BB-D75BAE4EA99E}")
DllCall(NumGet(NumGet(Close+0)+6*A_PtrSize), "ptr", Close) ; Close
ObjRelease(Close)
Close := ComObjQuery(SoftwareBitmap, IClosable := "{30D5A829-7FA4-4026-83BB-D75BAE4EA99E}")
DllCall(NumGet(NumGet(Close+0)+6*A_PtrSize), "ptr", Close) ; Close
ObjRelease(Close)
ObjRelease(IRandomAccessStream)
ObjRelease(BitmapDecoder)
ObjRelease(BitmapFrame)
ObjRelease(BitmapFrameWithSoftwareBitmap)
ObjRelease(SoftwareBitmap)
ObjRelease(OcrResult)
ObjRelease(LinesList)
return text
}
CreateClass(string, interface, ByRef Class){
CreateHString(string, hString)
VarSetCapacity(GUID, 16)
DllCall("ole32\CLSIDFromString", "wstr", interface, "ptr", &GUID)
result := DllCall("Combase.dll\RoGetActivationFactory", "ptr", hString, "ptr", &GUID, "ptr*", Class)
if (result != 0)
{
if (result = 0x80004002)
msgbox No such interface supported
else if (result = 0x80040154)
msgbox Class not registered
else
msgbox error: %result%
ExitApp
}
DeleteHString(hString)
}
CreateHString(string, ByRef hString){
DllCall("Combase.dll\WindowsCreateString", "wstr", string, "uint", StrLen(string), "ptr*", hString)
}
DeleteHString(hString){
DllCall("Combase.dll\WindowsDeleteString", "ptr", hString)
}
WaitForAsync(ByRef Object){
AsyncInfo := ComObjQuery(Object, IAsyncInfo := "{00000036-0000-0000-C000-000000000046}")
loop
{
DllCall(NumGet(NumGet(AsyncInfo+0)+7*A_PtrSize), "ptr", AsyncInfo, "uint*", status) ; IAsyncInfo.Status
if (status != 0)
{
if (status != 1)
{
DllCall(NumGet(NumGet(AsyncInfo+0)+8*A_PtrSize), "ptr", AsyncInfo, "uint*", ErrorCode) ; IAsyncInfo.ErrorCode
msgbox AsyncInfo status error: %ErrorCode%
ExitApp
}
ObjRelease(AsyncInfo)
break
}
sleep 10
}
DllCall(NumGet(NumGet(Object+0)+8*A_PtrSize), "ptr", Object, "ptr*", ObjectResult) ; GetResults
ObjRelease(Object)
Object := ObjectResult
}