英文:
How to use macOS/OS X Frameworks in go
问题
例如，如何使用CoreGraphics和CoreFoundation在macOS上操作屏幕并处理数据。
英文:
For example, how to use CoreGraphics and CoreFoundation to manipulate the screen and process data on macOS.
答案1
得分: 9
假设我们想要使用CoreGraphics和CoreFoundation来捕获屏幕并获取图像数据：
package main
// 要使用这两个库，我们需要定义相应的标志，包含所需的头文件，并在之后立即导入"C"
import (
// #cgo LDFLAGS: -framework CoreGraphics
// #cgo LDFLAGS: -framework CoreFoundation
// #include <CoreGraphics/CoreGraphics.h>
// #include <CoreFoundation/CoreFoundation.h>
"C"
"image"
"reflect"
"unsafe"
// 其他包...
)
func main() {
displayID := C.CGMainDisplayID()
width := int(C.CGDisplayPixelsWide(displayID))
height := int(C.CGDisplayPixelsHigh(displayID))
rawData := C.CGDataProviderCopyData(C.CGImageGetDataProvider(C.CGDisplayCreateImage(displayID)))
length := int(C.CFDataGetLength(rawData))
ptr := unsafe.Pointer(C.CFDataGetBytePtr(rawData))
var slice []byte
hdrp := (*reflect.SliceHeader)(unsafe.Pointer(&slice))
hdrp.Data = uintptr(ptr)
hdrp.Len = length
hdrp.Cap = length
imageBytes := make([]byte, length)
for i := 0; i < length; i += 4 {
imageBytes[i], imageBytes[i+2], imageBytes[i+1], imageBytes[i+3] = slice[i+2], slice[i], slice[i+1], slice[i+3]
}
C.CFRelease(rawData)
img := &image.RGBA{Pix: imageBytes, Stride: 4 * width, Rect: image.Rect(0, 0, width, height)}
// 现在我们可以保存或进一步处理图像了
}
以上是使用CoreGraphics和CoreFoundation捕获屏幕并获取图像数据的示例代码。
英文:
Let's say we want to use CoreGraphics and CoreFoundation to capture the screen and get the image data:
package main
// To use the two libraries we need to define the respective flags, include the required header files and import "C" immediately after
import (
// #cgo LDFLAGS: -framework CoreGraphics
// #cgo LDFLAGS: -framework CoreFoundation
// #include <CoreGraphics/CoreGraphics.h>
// #include <CoreFoundation/CoreFoundation.h>
"C"
"image"
"reflect"
"unsafe"
// other packages...
)
func main() {
displayID := C.CGMainDisplayID()
width := int(C.CGDisplayPixelsWide(displayID))
height := int(C.CGDisplayPixelsHigh(displayID))
rawData := C.CGDataProviderCopyData(C.CGImageGetDataProvider(C.CGDisplayCreateImage(displayID)))
length := int(C.CFDataGetLength(rawData))
ptr := unsafe.Pointer(C.CFDataGetBytePtr(rawData))
var slice []byte
hdrp := (*reflect.SliceHeader)(unsafe.Pointer(&slice))
hdrp.Data = uintptr(ptr)
hdrp.Len = length
hdrp.Cap = length
imageBytes := make([]byte, length)
for i := 0; i < length; i += 4 {
imageBytes[i], imageBytes[i+2], imageBytes[i+1], imageBytes[i+3] = slice[i+2], slice[i], slice[i+1], slice[i+3]
}
C.CFRelease(rawData)
img := &image.RGBA{Pix: imageBytes, Stride: 4 * width, Rect: image.Rect(0, 0, width, height)}
// There we go, we can now save or process the image further
}
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