Sekarang SDK kamera C ringan telah lengkap untuk Windows, Linux dan macOS, kami boleh menyepadukannya ke dalam bahasa pengaturcaraan peringkat tinggi yang lain. Dalam artikel ini, kami akan meneroka cara membina SDK kamera Python berdasarkan pustaka kamera C dan menggunakannya untuk pengimbasan berbilang kod bar dengan SDK Pembaca Kod Bar Dynamsoft.
Sambungan CPython ialah pustaka kongsi (cth., DLL pada Windows, .so pada Linux atau .dylib pada macOS) yang boleh dimuatkan ke dalam penterjemah Python semasa runtime dan digunakan untuk melanjutkan fungsinya. Struktur projek sambungan CPython kamera ringan adalah seperti berikut:
python-lite-camera │ │── include │ ├── Camera.h │ ├── CameraPreview.h │ ├── stb_image_write.h │── lib │ ├── linux │ │ ├── liblitecam.so │ ├── macos │ │ ├── liblitecam.dylib │ ├── windows │ │ ├── litecam.dll │ │ ├── litecam.lib ├── src │ ├── litecam.cpp │ ├── pycamera.h │ ├── pywindow.h │── litecam │ ├── __init__.py │── setup.py │── MANIFEST.in │── README.md
Penjelasan:
Tambah kandungan berikut pada setup.py:
from setuptools.command import build_ext
from setuptools import setup, Extension
import sys
import os
import io
from setuptools.command.install import install
import shutil
from pathlib import Path
lib_dir = ''
sources = [
"src/litecam.cpp",
]
include_dirs = [os.path.join(os.path.dirname(__file__), "include")]
libraries = ['litecam']
extra_compile_args = []
if sys.platform == "linux" or sys.platform == "linux2":
lib_dir = 'lib/linux'
extra_compile_args = ['-std=c++11']
extra_link_args = ["-Wl,-rpath=$ORIGIN"]
elif sys.platform == "darwin":
lib_dir = 'lib/macos'
extra_compile_args = ['-std=c++11']
extra_link_args = ["-Wl,-rpath,@loader_path"]
elif sys.platform == "win32":
lib_dir = 'lib/windows'
extra_link_args = []
else:
raise RuntimeError("Unsupported platform")
long_description = io.open("README.md", encoding="utf-8").read()
module_litecam = Extension(
"litecam",
sources=sources,
include_dirs=include_dirs,
library_dirs=[lib_dir],
libraries=libraries,
extra_compile_args=extra_compile_args,
extra_link_args=extra_link_args,
)
def copyfiles(src, dst):
if os.path.isdir(src):
filelist = os.listdir(src)
for file in filelist:
libpath = os.path.join(src, file)
shutil.copy2(libpath, dst)
else:
shutil.copy2(src, dst)
class CustomBuildExt(build_ext.build_ext):
def run(self):
build_ext.build_ext.run(self)
dst = os.path.join(self.build_lib, "litecam")
copyfiles(lib_dir, dst)
filelist = os.listdir(self.build_lib)
for file in filelist:
filePath = os.path.join(self.build_lib, file)
if not os.path.isdir(file):
copyfiles(filePath, dst)
os.remove(filePath)
class CustomBuildExtDev(build_ext.build_ext):
def run(self):
build_ext.build_ext.run(self)
dev_folder = os.path.join(Path(__file__).parent, 'litecam')
copyfiles(lib_dir, dev_folder)
filelist = os.listdir(self.build_lib)
for file in filelist:
filePath = os.path.join(self.build_lib, file)
if not os.path.isdir(file):
copyfiles(filePath, dev_folder)
class CustomInstall(install):
def run(self):
install.run(self)
setup(name='lite-camera',
version='2.0.1',
description='LiteCam is a lightweight, cross-platform library for capturing RGB frames from cameras and displaying them. Designed with simplicity and ease of integration in mind, LiteCam supports Windows, Linux and macOS platforms.',
long_description=long_description,
long_description_content_type="text/markdown",
author='yushulx',
url='https://github.com/yushulx/python-lite-camera',
license='MIT',
packages=['litecam'],
ext_modules=[module_litecam],
classifiers=[
"Development Status :: 5 - Production/Stable",
"Environment :: Console",
"Intended Audience :: Developers",
"Intended Audience :: Education",
"Intended Audience :: Information Technology",
"Intended Audience :: Science/Research",
"License :: OSI Approved :: MIT License",
"Operating System :: Microsoft :: Windows",
"Operating System :: MacOS",
"Operating System :: POSIX :: Linux",
"Programming Language :: Python",
"Programming Language :: Python :: 3",
"Programming Language :: Python :: 3 :: Only",
"Programming Language :: Python :: 3.6",
"Programming Language :: Python :: 3.7",
"Programming Language :: Python :: 3.8",
"Programming Language :: Python :: 3.9",
"Programming Language :: Python :: 3.10",
"Programming Language :: Python :: 3.11",
"Programming Language :: Python :: 3.12",
"Programming Language :: C++",
"Programming Language :: Python :: Implementation :: CPython",
"Topic :: Scientific/Engineering",
"Topic :: Software Development",
],
cmdclass={
'install': CustomInstall,
'build_ext': CustomBuildExt,
'develop': CustomBuildExtDev},
)
Penjelasan:
Fail pycamera.h mentakrifkan kelas Python PyCamera untuk menangkap bingkai daripada kamera, manakala fail pywindow.h mentakrifkan kelas Python PyWindow untuk memaparkan bingkai dalam tetingkap. Fail litecam.cpp berfungsi sebagai titik masuk untuk sambungan Python, di mana beberapa kaedah global ditakrifkan, dan kelas PyCamera dan PyWindow didaftarkan.
python-lite-camera │ │── include │ ├── Camera.h │ ├── CameraPreview.h │ ├── stb_image_write.h │── lib │ ├── linux │ │ ├── liblitecam.so │ ├── macos │ │ ├── liblitecam.dylib │ ├── windows │ │ ├── litecam.dll │ │ ├── litecam.lib ├── src │ ├── litecam.cpp │ ├── pycamera.h │ ├── pywindow.h │── litecam │ ├── __init__.py │── setup.py │── MANIFEST.in │── README.md
from setuptools.command import build_ext
from setuptools import setup, Extension
import sys
import os
import io
from setuptools.command.install import install
import shutil
from pathlib import Path
lib_dir = ''
sources = [
"src/litecam.cpp",
]
include_dirs = [os.path.join(os.path.dirname(__file__), "include")]
libraries = ['litecam']
extra_compile_args = []
if sys.platform == "linux" or sys.platform == "linux2":
lib_dir = 'lib/linux'
extra_compile_args = ['-std=c++11']
extra_link_args = ["-Wl,-rpath=$ORIGIN"]
elif sys.platform == "darwin":
lib_dir = 'lib/macos'
extra_compile_args = ['-std=c++11']
extra_link_args = ["-Wl,-rpath,@loader_path"]
elif sys.platform == "win32":
lib_dir = 'lib/windows'
extra_link_args = []
else:
raise RuntimeError("Unsupported platform")
long_description = io.open("README.md", encoding="utf-8").read()
module_litecam = Extension(
"litecam",
sources=sources,
include_dirs=include_dirs,
library_dirs=[lib_dir],
libraries=libraries,
extra_compile_args=extra_compile_args,
extra_link_args=extra_link_args,
)
def copyfiles(src, dst):
if os.path.isdir(src):
filelist = os.listdir(src)
for file in filelist:
libpath = os.path.join(src, file)
shutil.copy2(libpath, dst)
else:
shutil.copy2(src, dst)
class CustomBuildExt(build_ext.build_ext):
def run(self):
build_ext.build_ext.run(self)
dst = os.path.join(self.build_lib, "litecam")
copyfiles(lib_dir, dst)
filelist = os.listdir(self.build_lib)
for file in filelist:
filePath = os.path.join(self.build_lib, file)
if not os.path.isdir(file):
copyfiles(filePath, dst)
os.remove(filePath)
class CustomBuildExtDev(build_ext.build_ext):
def run(self):
build_ext.build_ext.run(self)
dev_folder = os.path.join(Path(__file__).parent, 'litecam')
copyfiles(lib_dir, dev_folder)
filelist = os.listdir(self.build_lib)
for file in filelist:
filePath = os.path.join(self.build_lib, file)
if not os.path.isdir(file):
copyfiles(filePath, dev_folder)
class CustomInstall(install):
def run(self):
install.run(self)
setup(name='lite-camera',
version='2.0.1',
description='LiteCam is a lightweight, cross-platform library for capturing RGB frames from cameras and displaying them. Designed with simplicity and ease of integration in mind, LiteCam supports Windows, Linux and macOS platforms.',
long_description=long_description,
long_description_content_type="text/markdown",
author='yushulx',
url='https://github.com/yushulx/python-lite-camera',
license='MIT',
packages=['litecam'],
ext_modules=[module_litecam],
classifiers=[
"Development Status :: 5 - Production/Stable",
"Environment :: Console",
"Intended Audience :: Developers",
"Intended Audience :: Education",
"Intended Audience :: Information Technology",
"Intended Audience :: Science/Research",
"License :: OSI Approved :: MIT License",
"Operating System :: Microsoft :: Windows",
"Operating System :: MacOS",
"Operating System :: POSIX :: Linux",
"Programming Language :: Python",
"Programming Language :: Python :: 3",
"Programming Language :: Python :: 3 :: Only",
"Programming Language :: Python :: 3.6",
"Programming Language :: Python :: 3.7",
"Programming Language :: Python :: 3.8",
"Programming Language :: Python :: 3.9",
"Programming Language :: Python :: 3.10",
"Programming Language :: Python :: 3.11",
"Programming Language :: Python :: 3.12",
"Programming Language :: C++",
"Programming Language :: Python :: Implementation :: CPython",
"Topic :: Scientific/Engineering",
"Topic :: Software Development",
],
cmdclass={
'install': CustomInstall,
'build_ext': CustomBuildExt,
'develop': CustomBuildExtDev},
)
Struktur PyCamera mewakili objek Python yang melilit objek C Camera. Pengendali ialah penunjuk kepada contoh kelas Kamera.
PyCamera_dealloc
#include <Python.h> #include <structmember.h> #include "Camera.h"
Mengagihkan objek Kamera dan melepaskan memori yang berkaitan.
PyCamera_new
typedef struct
{
PyObject_HEAD Camera *handler;
} PyCamera;
Mencipta contoh baharu PyCamera. Ia memperuntukkan memori untuk objek Python, mencipta objek Kamera baharu dan menyerahkannya kepada pengendali sendiri.
terbuka
static int PyCamera_clear(PyCamera *self)
{
if (self->handler)
{
delete self->handler;
}
return 0;
}
static void PyCamera_dealloc(PyCamera *self)
{
PyCamera_clear(self);
Py_TYPE(self)->tp_free((PyObject *)self);
}
Membuka kamera dengan indeks yang ditentukan.
listMediaTypes
static PyObject *PyCamera_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
PyCamera *self;
self = (PyCamera *)type->tp_alloc(type, 0);
if (self != NULL)
{
self->handler = new Camera();
}
return (PyObject *)self;
}
Mengembalikan senarai jenis media yang disokong. Untuk Windows, ia menukar rentetan aksara lebar kepada objek Unicode Python.
lepaskan
static PyObject *open(PyObject *obj, PyObject *args)
{
PyCamera *self = (PyCamera *)obj;
int index = 0;
if (!PyArg_ParseTuple(args, "i", &index))
{
return NULL;
}
bool ret = self->handler->Open(index);
return Py_BuildValue("i", ret);
}
Melepaskan kamera.
setResolution
static PyObject *listMediaTypes(PyObject *obj, PyObject *args)
{
PyCamera *self = (PyCamera *)obj;
std::vector<MediaTypeInfo> mediaTypes = self->handler->ListSupportedMediaTypes();
PyObject *pyList = PyList_New(0);
for (size_t i = 0; i < mediaTypes.size(); i++)
{
MediaTypeInfo &mediaType = mediaTypes[i];
#ifdef _WIN32
PyObject *subtypeName = PyUnicode_FromWideChar(mediaType.subtypeName, wcslen(mediaType.subtypeName));
PyObject *pyMediaType = Py_BuildValue("{s:i,s:i,s:O}",
"width", mediaType.width,
"height", mediaType.height,
"subtypeName", subtypeName);
if (subtypeName != NULL)
{
Py_DECREF(subtypeName);
}
#else
PyObject *pyMediaType = Py_BuildValue("{s:i,s:i,s:s}",
"width", mediaType.width,
"height", mediaType.height,
"subtypeName", mediaType.subtypeName);
#endif
PyList_Append(pyList, pyMediaType);
}
return pyList;
}
Menetapkan resolusi kamera.
captureFrame
static PyObject *release(PyObject *obj, PyObject *args)
{
PyCamera *self = (PyCamera *)obj;
self->handler->Release();
Py_RETURN_NONE;
}
Merakam bingkai daripada kamera dan mengembalikan data RGB sebagai tatasusunan bait Python.
getWidth dan getHeight
static PyObject *setResolution(PyObject *obj, PyObject *args)
{
PyCamera *self = (PyCamera *)obj;
int width = 0, height = 0;
if (!PyArg_ParseTuple(args, "ii", &width, &height))
{
return NULL;
}
int ret = self->handler->SetResolution(width, height);
return Py_BuildValue("i", ret);
}
Mengembalikan lebar dan ketinggian bingkai yang ditangkap.
static PyObject *captureFrame(PyObject *obj, PyObject *args)
{
PyCamera *self = (PyCamera *)obj;
FrameData frame = self->handler->CaptureFrame();
if (frame.rgbData)
{
PyObject *rgbData = PyByteArray_FromStringAndSize((const char *)frame.rgbData, frame.size);
PyObject *pyFrame = Py_BuildValue("iiiO", frame.width, frame.height, frame.size, rgbData);
ReleaseFrame(frame);
return pyFrame;
}
else
{
Py_RETURN_NONE;
}
}
Mentakrifkan kaedah yang tersedia pada objek PyCamera Python. Kaedah ini dikaitkan dengan fungsi C sepadan yang ditakrifkan di atas.
static PyObject *getWidth(PyObject *obj, PyObject *args)
{
PyCamera *self = (PyCamera *)obj;
int width = self->handler->frameWidth;
return Py_BuildValue("i", width);
}
static PyObject *getHeight(PyObject *obj, PyObject *args)
{
PyCamera *self = (PyCamera *)obj;
int height = self->handler->frameHeight;
return Py_BuildValue("i", height);
}
Mentakrifkan jenis PyCamera, termasuk kaedahnya, peruntukan memori, deallocation dan gelagat lain.
static PyMethodDef instance_methods[] = {
{"open", open, METH_VARARGS, NULL},
{"listMediaTypes", listMediaTypes, METH_VARARGS, NULL},
{"release", release, METH_VARARGS, NULL},
{"setResolution", setResolution, METH_VARARGS, NULL},
{"captureFrame", captureFrame, METH_VARARGS, NULL},
{"getWidth", getWidth, METH_VARARGS, NULL},
{"getHeight", getHeight, METH_VARARGS, NULL},
{NULL, NULL, 0, NULL}};
static PyTypeObject PyCameraType = {
PyVarObject_HEAD_INIT(NULL, 0) "litecam.PyCamera", /* tp_name */
sizeof(PyCamera), /* tp_basicsize */
0, /* tp_itemsize */
(destructor)PyCamera_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_reserved */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
PyObject_GenericSetAttr, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/
"PyCamera", /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
instance_methods, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
PyCamera_new, /* tp_new */
};
Mentakrifkan struct PyWindow yang membalut objek C CameraWindow. Ahli pengendali menunjuk pada contoh CameraWindow.
PyWindow_dealloc
#include <Python.h> #include <structmember.h> #include "CameraPreview.h"
Mengagihkan objek CameraWindow dan melepaskan memori.
PyWindow_new
typedef struct
{
PyObject_HEAD CameraWindow *handler;
} PyWindow;
Mencipta tika baharu PyWindow. Ia memperuntukkan memori untuk objek Python, mencipta objek CameraWindow baharu dan menugaskannya kepada pengendali diri>.
Kunci tunggu
python-lite-camera │ │── include │ ├── Camera.h │ ├── CameraPreview.h │ ├── stb_image_write.h │── lib │ ├── linux │ │ ├── liblitecam.so │ ├── macos │ │ ├── liblitecam.dylib │ ├── windows │ │ ├── litecam.dll │ │ ├── litecam.lib ├── src │ ├── litecam.cpp │ ├── pycamera.h │ ├── pywindow.h │── litecam │ ├── __init__.py │── setup.py │── MANIFEST.in │── README.md
Menunggu acara tekan kekunci dan mengembalikan False jika kekunci sepadan dengan aksara yang ditentukan. False bermaksud aplikasi harus keluar.
Rangka persembahan
from setuptools.command import build_ext
from setuptools import setup, Extension
import sys
import os
import io
from setuptools.command.install import install
import shutil
from pathlib import Path
lib_dir = ''
sources = [
"src/litecam.cpp",
]
include_dirs = [os.path.join(os.path.dirname(__file__), "include")]
libraries = ['litecam']
extra_compile_args = []
if sys.platform == "linux" or sys.platform == "linux2":
lib_dir = 'lib/linux'
extra_compile_args = ['-std=c++11']
extra_link_args = ["-Wl,-rpath=$ORIGIN"]
elif sys.platform == "darwin":
lib_dir = 'lib/macos'
extra_compile_args = ['-std=c++11']
extra_link_args = ["-Wl,-rpath,@loader_path"]
elif sys.platform == "win32":
lib_dir = 'lib/windows'
extra_link_args = []
else:
raise RuntimeError("Unsupported platform")
long_description = io.open("README.md", encoding="utf-8").read()
module_litecam = Extension(
"litecam",
sources=sources,
include_dirs=include_dirs,
library_dirs=[lib_dir],
libraries=libraries,
extra_compile_args=extra_compile_args,
extra_link_args=extra_link_args,
)
def copyfiles(src, dst):
if os.path.isdir(src):
filelist = os.listdir(src)
for file in filelist:
libpath = os.path.join(src, file)
shutil.copy2(libpath, dst)
else:
shutil.copy2(src, dst)
class CustomBuildExt(build_ext.build_ext):
def run(self):
build_ext.build_ext.run(self)
dst = os.path.join(self.build_lib, "litecam")
copyfiles(lib_dir, dst)
filelist = os.listdir(self.build_lib)
for file in filelist:
filePath = os.path.join(self.build_lib, file)
if not os.path.isdir(file):
copyfiles(filePath, dst)
os.remove(filePath)
class CustomBuildExtDev(build_ext.build_ext):
def run(self):
build_ext.build_ext.run(self)
dev_folder = os.path.join(Path(__file__).parent, 'litecam')
copyfiles(lib_dir, dev_folder)
filelist = os.listdir(self.build_lib)
for file in filelist:
filePath = os.path.join(self.build_lib, file)
if not os.path.isdir(file):
copyfiles(filePath, dev_folder)
class CustomInstall(install):
def run(self):
install.run(self)
setup(name='lite-camera',
version='2.0.1',
description='LiteCam is a lightweight, cross-platform library for capturing RGB frames from cameras and displaying them. Designed with simplicity and ease of integration in mind, LiteCam supports Windows, Linux and macOS platforms.',
long_description=long_description,
long_description_content_type="text/markdown",
author='yushulx',
url='https://github.com/yushulx/python-lite-camera',
license='MIT',
packages=['litecam'],
ext_modules=[module_litecam],
classifiers=[
"Development Status :: 5 - Production/Stable",
"Environment :: Console",
"Intended Audience :: Developers",
"Intended Audience :: Education",
"Intended Audience :: Information Technology",
"Intended Audience :: Science/Research",
"License :: OSI Approved :: MIT License",
"Operating System :: Microsoft :: Windows",
"Operating System :: MacOS",
"Operating System :: POSIX :: Linux",
"Programming Language :: Python",
"Programming Language :: Python :: 3",
"Programming Language :: Python :: 3 :: Only",
"Programming Language :: Python :: 3.6",
"Programming Language :: Python :: 3.7",
"Programming Language :: Python :: 3.8",
"Programming Language :: Python :: 3.9",
"Programming Language :: Python :: 3.10",
"Programming Language :: Python :: 3.11",
"Programming Language :: Python :: 3.12",
"Programming Language :: C++",
"Programming Language :: Python :: Implementation :: CPython",
"Topic :: Scientific/Engineering",
"Topic :: Software Development",
],
cmdclass={
'install': CustomInstall,
'build_ext': CustomBuildExt,
'develop': CustomBuildExtDev},
)
Memaparkan bingkai dalam tetingkap.
drawContour
#include <Python.h> #include <structmember.h> #include "Camera.h"
Melukis kontur (siri titik) pada bingkai.
drawTeks
typedef struct
{
PyObject_HEAD Camera *handler;
} PyCamera;
Melukis teks pada bingkai.
static int PyCamera_clear(PyCamera *self)
{
if (self->handler)
{
delete self->handler;
}
return 0;
}
static void PyCamera_dealloc(PyCamera *self)
{
PyCamera_clear(self);
Py_TYPE(self)->tp_free((PyObject *)self);
}
Mentakrifkan kaedah yang tersedia pada objek Python PyWindow.
static PyObject *PyCamera_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
PyCamera *self;
self = (PyCamera *)type->tp_alloc(type, 0);
if (self != NULL)
{
self->handler = new Camera();
}
return (PyObject *)self;
}
Mentakrifkan jenis PyWindow, termasuk kaedahnya, peruntukan memori, deallocation dan gelagat lain.
static PyObject *open(PyObject *obj, PyObject *args)
{
PyCamera *self = (PyCamera *)obj;
int index = 0;
if (!PyArg_ParseTuple(args, "i", &index))
{
return NULL;
}
bool ret = self->handler->Open(index);
return Py_BuildValue("i", ret);
}
Penjelasan:
Mod Pembangunan
static PyObject *listMediaTypes(PyObject *obj, PyObject *args)
{
PyCamera *self = (PyCamera *)obj;
std::vector<MediaTypeInfo> mediaTypes = self->handler->ListSupportedMediaTypes();
PyObject *pyList = PyList_New(0);
for (size_t i = 0; i < mediaTypes.size(); i++)
{
MediaTypeInfo &mediaType = mediaTypes[i];
#ifdef _WIN32
PyObject *subtypeName = PyUnicode_FromWideChar(mediaType.subtypeName, wcslen(mediaType.subtypeName));
PyObject *pyMediaType = Py_BuildValue("{s:i,s:i,s:O}",
"width", mediaType.width,
"height", mediaType.height,
"subtypeName", subtypeName);
if (subtypeName != NULL)
{
Py_DECREF(subtypeName);
}
#else
PyObject *pyMediaType = Py_BuildValue("{s:i,s:i,s:s}",
"width", mediaType.width,
"height", mediaType.height,
"subtypeName", mediaType.subtypeName);
#endif
PyList_Append(pyList, pyMediaType);
}
return pyList;
}
Pakej Roda
static PyObject *release(PyObject *obj, PyObject *args)
{
PyCamera *self = (PyCamera *)obj;
self->handler->Release();
Py_RETURN_NONE;
}
Pengagihan Sumber
static PyObject *setResolution(PyObject *obj, PyObject *args)
{
PyCamera *self = (PyCamera *)obj;
int width = 0, height = 0;
if (!PyArg_ParseTuple(args, "ii", &width, &height))
{
return NULL;
}
int ret = self->handler->SetResolution(width, height);
return Py_BuildValue("i", ret);
}
Pasang SDK kamera Python dan SDK Pembaca Kod Bar Dynamsoft:
static PyObject *captureFrame(PyObject *obj, PyObject *args)
{
PyCamera *self = (PyCamera *)obj;
FrameData frame = self->handler->CaptureFrame();
if (frame.rgbData)
{
PyObject *rgbData = PyByteArray_FromStringAndSize((const char *)frame.rgbData, frame.size);
PyObject *pyFrame = Py_BuildValue("iiiO", frame.width, frame.height, frame.size, rgbData);
ReleaseFrame(frame);
return pyFrame;
}
else
{
Py_RETURN_NONE;
}
}
Dapatkan lesen percubaan percuma selama 30 hari untuk Pembaca Kod Bar Dynamsoft.
Buat skrip Python untuk pengimbasan berbilang kod bar:
static PyObject *getWidth(PyObject *obj, PyObject *args)
{
PyCamera *self = (PyCamera *)obj;
int width = self->handler->frameWidth;
return Py_BuildValue("i", width);
}
static PyObject *getHeight(PyObject *obj, PyObject *args)
{
PyCamera *self = (PyCamera *)obj;
int height = self->handler->frameHeight;
return Py_BuildValue("i", height);
}
Ganti LESEN-KUNCI dengan kunci lesen Pembaca Kod Bar Dynamsoft anda.
Jalankan skrip:
static PyMethodDef instance_methods[] = {
{"open", open, METH_VARARGS, NULL},
{"listMediaTypes", listMediaTypes, METH_VARARGS, NULL},
{"release", release, METH_VARARGS, NULL},
{"setResolution", setResolution, METH_VARARGS, NULL},
{"captureFrame", captureFrame, METH_VARARGS, NULL},
{"getWidth", getWidth, METH_VARARGS, NULL},
{"getHeight", getHeight, METH_VARARGS, NULL},
{NULL, NULL, 0, NULL}};
https://github.com/yushulx/python-lite-camera
Atas ialah kandungan terperinci Membina SDK Kamera Python dan Menggunakannya untuk Pengimbasan Berbilang Kod Bar. Untuk maklumat lanjut, sila ikut artikel berkaitan lain di laman web China PHP!
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