golang怎么实现截图功能
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在Golang中,实现截图功能主要分为以下几个步骤:
首先,需要引入一些必要的包,比如image和syscall等。
import (
"image"
"os"
"syscall"
)
接着,需要使用系统函数获取当前正在运行的窗口信息,获取操作系统窗口句柄,然后可转换为Golang中的图像对象。
func getScreenShot() error {
hwnd := syscall.GetForegroundWindow()
if hwnd == 0 {
return fmt.Errorf("could not find foreground window")
}
dc := syscall.GetDC(hwnd)
defer syscall.ReleaseDC(hwnd, dc)
rect := &syscall.Rect{}
if !syscall.GetWindowRect(hwnd, rect) {
return fmt.Errorf("could not get window rect")
}
width := rect.Right - rect.Left
height := rect.Bottom - rect.Top
img, err := image.NewRGBA(image.Rect(0, 0, width, height))
if err != nil {
return err
}
return nil
}
然后,需要从设备上下文中获取图像数据,将其存储到Golang中的图像对象中。
pixels := make([]uint8, widthheight4)
_, _, err = syscall.BitBlt(0, 0, width, height, dc, 0, 0, syscall.SRCCOPY)
if err != nil {
return err
}
bi := &syscall.Bitmapinfo{}
bi.BmiHeader.BiSize = uint32(unsafe.Sizeof(bi.BmiHeader))
bi.BmiHeader.BiWidth = width;
bi.BmiHeader.BiHeight = -height;
bi.BmiHeader.BiPlanes = 1
bi.BmiHeader.BiBitCount = 32
bi.BmiHeader.BiCompression = syscall.BI_RGB
bi.BmiHeader.BiSizeImage = uint32(len(pixels))
if _, _, err = syscall.GetDIBits(dc, syscall.HBITMAP(syscall.GetStockObject(syscall.BLACK_BRUSH)), 0, uint32(height), &pixels[0], bi, 0); err != nil {
return err
}
for y := 0; y < height; y++ {
for x := 0; x < width; x++ {
i := (y*width + x) * 4
R := pixels[i+2]
G := pixels[i+1]
B := pixels[i]
img.Set(x, y, color.RGBA{R, G, B, 255})
}
}
最后,将Golang中的图像对象保存为文件。
file, err := os.Create("screenshot.png")
if err != nil {
return err
}
defer file.Close()
if err = png.Encode(file, img); err != nil {
return err
}
完整代码实现:
package main
import (
"fmt"
"image"
"image/color"
"image/png"
"os"
"syscall"
"unsafe"
)
func getScreenShot() error {
hwnd := syscall.GetForegroundWindow()
if hwnd == 0 {
return fmt.Errorf("could not find foreground window")
}
dc := syscall.GetDC(hwnd)
defer syscall.ReleaseDC(hwnd, dc)
rect := &syscall.Rect{}
if !syscall.GetWindowRect(hwnd, rect) {
return fmt.Errorf("could not get window rect")
}
width := rect.Right - rect.Left
height := rect.Bottom - rect.Top
img, err := image.NewRGBA(image.Rect(0, 0, width, height))
if err != nil {
return err
}
defer func() {
if panicErr := recover(); panicErr != nil {
err = fmt.Errorf("%v", panicErr)
}
}()
pixels := make([]uint8, width*height*4)
_, _, err = syscall.BitBlt(0, 0, width, height, dc, 0, 0, syscall.SRCCOPY)
if err != nil {
return err
}
bi := &syscall.Bitmapinfo{}
bi.BmiHeader.BiSize = uint32(unsafe.Sizeof(bi.BmiHeader))
bi.BmiHeader.BiWidth = width;
bi.BmiHeader.BiHeight = -height;
bi.BmiHeader.BiPlanes = 1
bi.BmiHeader.BiBitCount = 32
bi.BmiHeader.BiCompression = syscall.BI_RGB
bi.BmiHeader.BiSizeImage = uint32(len(pixels))
if _, _, err = syscall.GetDIBits(dc, syscall.HBITMAP(syscall.GetStockObject(syscall.BLACK_BRUSH)), 0, uint32(height), &pixels[0], bi, 0); err != nil {
return err
}
for y := 0; y < height; y++ {
for x := 0; x < width; x++ {
i := (y*width + x) * 4
R := pixels[i+2]
G := pixels[i+1]
B := pixels[i]
img.Set(x, y, color.RGBA{R, G, B, 255})
}
}
file, err := os.Create("screenshot.png")
if err != nil {
return err
}
defer file.Close()
if err = png.Encode(file, img); err != nil {
return err
}
return nil
}
func main() {
err := getScreenShot()
if err != nil {
fmt.Println(err)
}
}
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