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。
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.Leftheight := rect.Bottom - rect.Topimg, 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.Leftheight := rect.Bottom - rect.Topimg, 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 = 1bi.BmiHeader.BiBitCount = 32bi.BmiHeader.BiCompression = syscall.BI_RGBbi.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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