这篇文章主要介绍“golang怎么实现截图功能”的相关知识,小编通过实际案例向大家展示操作过程,操作方法简单快捷,实用性强,希望这篇“golang怎么实现截图功能”文章能帮助大家解决问题。
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。
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。
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。
最后,将Golang中的图像对象保存为文件。
import (
"image" "os" "syscall"
)
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
}
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}) }
}
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) }
}