我想从网络摄像头捕获图像，并且想以所需尺寸打印捕获的图像。
I want to capture a image from a web cam and i want to print dat captured image in desired size.
考虑以编程方式截取屏幕截图并进行裁剪。如果这是不可能的，您应该使用驱动程序直接与硬件对话。
另请提供有关操作系统、网络摄像头品牌和编程平台的更多信息，
consider taking a screenshot programatically and cropping it. if this is not possible, you should talk to the hardware directly by using the driver.
also please provide more info on os, webcam make and programming platform,
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考虑以编程方式截取屏幕截图并进行裁剪。如果这是不可能的，您应该使用驱动程序直接与硬件对话。
另请提供有关操作系统、网络摄像头品牌和编程平台的更多信息，
consider taking a screenshot programatically and cropping it. if this is not possible, you should talk to the hardware directly by using the driver.
also please provide more info on os, webcam make and programming platform,