image = QImage(canvas.buffer_rgba()) TypeError: QImage(): argument 1 has unexpected type 'memoryview'

这个错误通常是因为 `QImage()` 函数接受的参数类型与实际传入的类型不匹配。在这种情况下，`canvas.buffer_rgba()` 返回的是一个 `memoryview` 对象，而 `QImage()` 函数期望的是一个 `bytes` 类型的对象。

可以尝试将 `memoryview` 对象转换为 `bytes` 对象，例如：

image = QImage(bytes(canvas.buffer_rgba()))

如果这样还是无法解决问题，可以尝试使用 `numpy` 库将 `memoryview` 对象转换为 `numpy` 数组，然后再将其转换为 `bytes` 对象，例如：

import numpy as np

buffer = np.asarray(canvas.buffer_rgba())
image = QImage(bytes(buffer))

这样应该就可以成功创建一个 `QImage` 对象了。

相关问题

image = QImage(bytes(buffer)) TypeError: QImage(): argument 1 has unexpected type 'bytes'

这个错误可能是因为传递给 `QImage` 的参数类型不正确。`QImage` 的构造函数需要一个 `bytearray` 或者 `str` 类型的参数，而不是一个 `bytes` 类型的参数。

你可以尝试将 `bytes` 转换为 `bytearray` 或者 `str` 类型，然后再传递给 `QImage` 函数。例如：

# 将 bytes 转换为 bytearray
bytearray_buffer = bytearray(buffer)
image = QImage(bytearray_buffer)

# 将 bytes 转换为 str
str_buffer = buffer.decode()
image = QImage(str_buffer)

你可以根据你的需求选择其中的一种方法来解决这个问题。

修改以下代码使其能够输出模型预测结果： def open_image(self): file_dialog = QFileDialog() file_paths, _ = file_dialog.getOpenFileNames(self, "选择图片", "", "Image Files (*.png *.jpg *.jpeg)") if file_paths: self.display_images(file_paths) def preprocess_images(self, image_paths): data_transform = transforms.Compose([ transforms.CenterCrop(150), transforms.ToTensor(), transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225]) ]) self.current_image_paths = [] images = [] for image_path in image_paths: image = Image.open(image_path) image = data_transform(image) image = torch.unsqueeze(image, dim=0) images.append(image) self.current_image_paths.append(image_path) return images def predict_images(self): if not self.current_image_paths: return for i, image_path in enumerate(self.current_image_paths): image = self.preprocess_image(image_path) output = self.model(image) predicted_class = self.class_dict[output.argmax().item()] self.result_labels[i].setText(f"Predicted Class: {predicted_class}") self.progress_bar.setValue((i+1)*20) def display_images(self, image_paths): for i, image_path in enumerate(image_paths): image = QImage(image_path) image = image.scaled(300, 300, Qt.KeepAspectRatio) if i == 0: self.image_label_1.setPixmap(QPixmap.fromImage(image)) elif i == 1: self.image_label_2.setPixmap(QPixmap.fromImage(image)) elif i == 2: self.image_label_3.setPixmap(QPixmap.fromImage(image)) elif i == 3: self.image_label_4.setPixmap(QPixmap.fromImage(image)) elif i == 4: self.image_label_5.setPixmap(QPixmap.fromImage(image))

请注意，代码中的 preprocess_images 函数和 predict_images 函数中的 self.preprocess_image(image_path) 需要修改为 self.preprocess_images([image_path])。修改后的代码如下：

def open_image(self):
    file_dialog = QFileDialog()
    file_paths, _ = file_dialog.getOpenFileNames(self, "选择图片", "", "Image Files (*.png *.jpg *.jpeg)")
    if file_paths:
        self.display_images(file_paths)

def preprocess_images(self, image_paths):
    data_transform = transforms.Compose([
        transforms.CenterCrop(150),
        transforms.ToTensor(),
        transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225])
    ])
    self.current_image_paths = []
    images = []
    for image_path in image_paths:
        image = Image.open(image_path)
        image = data_transform(image)
        image = torch.unsqueeze(image, dim=0)
        images.append(image)
        self.current_image_paths.append(image_path)
    return images

def predict_images(self):
    if not self.current_image_paths:
        return
    for i, image_path in enumerate(self.current_image_paths):
        image = self.preprocess_images([image_path])
        output = self.model(image[0])
        predicted_class = self.class_dict[output.argmax().item()]
        self.result_labels[i].setText(f"Predicted Class: {predicted_class}")
        self.progress_bar.setValue((i+1)*20)

def display_images(self, image_paths):
    for i, image_path in enumerate(image_paths):
        image = QImage(image_path)
        image = image.scaled(300, 300, Qt.KeepAspectRatio)
        if i == 0:
            self.image_label_1.setPixmap(QPixmap.fromImage(image))
        elif i == 1:
            self.image_label_2.setPixmap(QPixmap.fromImage(image))
        elif i == 2:
            self.image_label_3.setPixmap(QPixmap.fromImage(image))
        elif i == 3:
            self.image_label_4.setPixmap(QPixmap.fromImage(image))
        elif i == 4:
            self.image_label_5.setPixmap(QPixmap.fromImage(image))