Re: error:depythonifying 'charptr', got 'str'
Ronald Oussoren via Pyobjc-dev <[email protected]> Fri, 18 Jun 2021 15:09:23 +0200
| Newsgroups | gmane.comp.python.pyobjc.devel |
|---|---|
| Message-ID | <[email protected]> |
--===============6662313212223103940== Content-Type: multipart/alternative; boundary="Apple-Mail=_17A63BC9-1E33-4322-80D0-BAC605C54172" --Apple-Mail=_17A63BC9-1E33-4322-80D0-BAC605C54172 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 > On 18 Jun 2021, at 14:10, Liu Aubrey <[email protected]> wrote: >=20 > Dear teams: > I am confused by this error:ValueError: depythonifying 'charptr', = got =E2=80=98str=E2=80=99 for few days and cannot find the reason. > My pyobjc version is 7.3, macOS version is 10.15.7 and the objective-c = function is below >=20 > // Function to read Test Device Register > -(BOOL) readRegisterAtAddress:(NSUInteger)address > withLength:(NSUInteger)length > data:(uint8_t *)data > error:(NSError **)error; Is this an API in one of the frameworks from Apple? If it is not you=E2=80=99ll have to register some metadata to use this = API because the method interface is too complicated to handle unaided. Something like this should work (replace =E2=80=98ClassName=E2=80=99 by = the name of the actual class): import objc objc.registerMetaDataForSelector(b'ClassName', = b'readRegisterAtAddress:withLength:data:error:=E2=80=99,=20 {=20 'retval': { 'type=E2=80=99: objc._C_NSBOOL },=20 'arguments': {=20 4: { 'type_modifier=E2=80=99: objc._C_OUT, = 'c_array_length_in_arg': 3 },=20 5: { 'type_modifier=E2=80=99: objc._C_OUT } } } ) This tells PyObjC that: * The return value is a boolean, otherwise the return value will be a = small integer * The 4th argument is an output argument and is a buffer whose size is = in the 3rd argument * The 5th argument is a pass-by-reference output argument Note that counting includes implicit arguments for the Objective-C = selector, therefore the first =E2=80=9Creal=E2=80=9D argument has offset = 2. Usage of the API: ok, data, error =3D = device.device.readRegisterAtAddress_withLength_data_(0x1c, 4, None, = None) Ronald =20 >=20 > I used it in this way > data =3D '\x00'*4 > device.device.readRegisterAtAddress_withLength_data_error_(0x1c, 4, = data, None) > Can you help me to solve this issue. > Thank you very much. >=20 > Aubrey.Liu >=20 > =E5=8F=91=E8=87=AA=E6=88=91=E7=9A=84iPhone > _______________________________________________ > Pyobjc-dev mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/pyobjc-dev =E2=80=94 Twitter / micro.blog: @ronaldoussoren Blog: https://blog.ronaldoussoren.net/ --Apple-Mail=_17A63BC9-1E33-4322-80D0-BAC605C54172 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 <html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; = charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; = -webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><br = class=3D""><div><br class=3D""><blockquote type=3D"cite" class=3D""><div = class=3D"">On 18 Jun 2021, at 14:10, Liu Aubrey <<a = href=3D"mailto:[email protected]" class=3D"">[email protected]</a>> = wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div = class=3D"">Dear teams:<br class=3D""> I am confused by = this error:ValueError: depythonifying 'charptr', got =E2=80=98str=E2=80=99= for few days and cannot find the reason.<br class=3D"">My pyobjc = version is 7.3, macOS version is 10.15.7 and the objective-c function is = below<br class=3D""><br class=3D"">// Function to read Test Device = Register<br class=3D""> -(BOOL) = readRegisterAtAddress:(NSUInteger)address<br class=3D""> = withLength:(NSUInteger)length<br class=3D""> = data:(uint8_t *)data<br class=3D""> = error:(NSError **)error;<br = class=3D""></div></div></blockquote><div><br class=3D""></div>Is this an = API in one of the frameworks from Apple?</div><div><br = class=3D""></div><div>If it is not you=E2=80=99ll have to register some = metadata to use this API because the method interface is too complicated = to handle unaided.</div><div><br class=3D""></div><div>Something like = this should work (replace =E2=80=98ClassName=E2=80=99 by the name of the = actual class):</div><div><br class=3D""></div><div>import = objc</div><div><div style=3D"margin: 0px; font-stretch: normal; = font-size: 11px; line-height: normal; font-family: Menlo;" = class=3D""><span style=3D"font-variant-ligatures: no-common-ligatures" = class=3D"">objc.registerMetaDataForSelector(b'ClassName', = b'readRegisterAtAddress:withLength:data:error:=E2=80=99, </span></div= ><div style=3D"margin: 0px; font-stretch: normal; font-size: 11px; = line-height: normal; font-family: Menlo;" class=3D""><span = style=3D"font-variant-ligatures: no-common-ligatures" class=3D""> = { </span></div><div style=3D"margin: 0px; font-stretch: = normal; font-size: 11px; line-height: normal; font-family: Menlo;" = class=3D""><span style=3D"font-variant-ligatures: no-common-ligatures" = class=3D""> 'retval': { 'type=E2=80=99: = objc._C_NSBOOL }, </span></div><div style=3D"margin: 0px; = font-stretch: normal; font-size: 11px; line-height: normal; font-family: = Menlo;" class=3D""><span style=3D"font-variant-ligatures: = no-common-ligatures" class=3D""> 'arguments': = { </span></div><div style=3D"margin: 0px; font-stretch: normal; = font-size: 11px; line-height: normal; font-family: Menlo;" = class=3D""><span style=3D"font-variant-ligatures: no-common-ligatures" = class=3D""> 4: { 'type_modifier=E2=80=99= : objc._C_OUT, 'c_array_length_in_arg': 3 }, </span></div><div = style=3D"margin: 0px; font-stretch: normal; font-size: 11px; = line-height: normal; font-family: Menlo;" class=3D""><span = style=3D"font-variant-ligatures: no-common-ligatures" class=3D""> = 5: { 'type_modifier=E2=80=99: objc._C_OUT = }</span></div><div style=3D"margin: 0px; font-stretch: normal; = font-size: 11px; line-height: normal; font-family: Menlo;" = class=3D""><span style=3D"font-variant-ligatures: no-common-ligatures" = class=3D""> }</span></div><div style=3D"margin: = 0px; font-stretch: normal; font-size: 11px; line-height: normal; = font-family: Menlo;" class=3D""><span style=3D"font-variant-ligatures: = no-common-ligatures" class=3D""> }</span></div><div = style=3D"margin: 0px; font-stretch: normal; font-size: 11px; = line-height: normal; font-family: Menlo;" class=3D""><span = style=3D"font-variant-ligatures: no-common-ligatures" = class=3D"">)</span></div></div><div><br class=3D""></div><div>This tells = PyObjC that:</div><div>* The return value is a boolean, otherwise the = return value will be a small integer</div><div>* The 4th argument is an = output argument and is a buffer whose size is in the 3rd = argument</div><div>* The 5th argument is a pass-by-reference output = argument</div><div><br class=3D""></div><div>Note that counting includes = implicit arguments for the Objective-C selector, therefore the first = =E2=80=9Creal=E2=80=9D argument has offset 2.</div><div><br = class=3D""></div><div>Usage of the API:</div><div><br = class=3D""></div><div>ok, data, error =3D = device.device.readRegisterAtAddress_withLength_data_(0x1c, 4, None, = None)</div><div><br class=3D""></div><div>Ronald</div><div> = </div><div><blockquote type=3D"cite" class=3D""><div class=3D""><div= class=3D""><br class=3D"">I used it in this way<br class=3D"">data =3D = '\x00'*4<br = class=3D"">device.device.readRegisterAtAddress_withLength_data_error_(0x1c= , 4, data, None)<br class=3D"">Can you help me to solve this issue.<br = class=3D"">Thank you very much.<br class=3D""><br class=3D"">Aubrey.Liu<br= class=3D""><br class=3D"">=E5=8F=91=E8=87=AA=E6=88=91=E7=9A=84iPhone<br = class=3D"">_______________________________________________<br = class=3D"">Pyobjc-dev mailing list<br class=3D""><a = href=3D"mailto:[email protected]" = class=3D"">[email protected]</a><br = class=3D"">https://lists.sourceforge.net/lists/listinfo/pyobjc-dev<br = class=3D""></div></div></blockquote></div><br class=3D""><div class=3D""> <div dir=3D"auto" style=3D"word-wrap: break-word; -webkit-nbsp-mode: = space; line-break: after-white-space;" class=3D""><div = style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: = Helvetica; font-size: 12px; font-style: normal; font-variant-caps: = normal; font-weight: normal; letter-spacing: normal; text-align: start; = text-indent: 0px; text-transform: none; white-space: normal; = word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: = none;">=E2=80=94</div><div style=3D"caret-color: rgb(0, 0, 0); color: = rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: = normal; font-variant-caps: normal; font-weight: normal; letter-spacing: = normal; text-align: start; text-indent: 0px; text-transform: none; = white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; = text-decoration: none;"><br class=3D""></div><div style=3D"caret-color: = rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: = 12px; font-style: normal; font-variant-caps: normal; font-weight: = normal; letter-spacing: normal; text-align: start; text-indent: 0px; = text-transform: none; white-space: normal; word-spacing: 0px; = -webkit-text-stroke-width: 0px; text-decoration: none;">Twitter / = micro.blog: @ronaldoussoren</div><div style=3D"caret-color: rgb(0, 0, = 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; = font-style: normal; font-variant-caps: normal; font-weight: normal; = letter-spacing: normal; text-align: start; text-indent: 0px; = text-transform: none; white-space: normal; word-spacing: 0px; = -webkit-text-stroke-width: 0px; text-decoration: none;">Blog: <a = href=3D"https://blog.ronaldoussoren.net/" = class=3D"">https://blog.ronaldoussoren.net/</a></div></div> </div> <br class=3D""></body></html>= --Apple-Mail=_17A63BC9-1E33-4322-80D0-BAC605C54172-- --===============6662313212223103940== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline --===============6662313212223103940== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Pyobjc-dev mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/pyobjc-dev --===============6662313212223103940==--