所以我想使用下面的方法在 golang 中創(chuàng)建一個下載文件的函數(shù)，我將這個 golang 項目構(gòu)建到 C .dll 中使用go build -buildmode=c-shared -o patcher.dll main.go我設(shè)法在我的 C# 應(yīng)用程序上使用這個函數(shù)來獲取文件下載的進(jìn)度，如果我只是使用 DownloadFile() 直接打印它，我當(dāng)前的函數(shù) (DownloadFfile) 就可以工作，但是我想在我的 C# 應(yīng)用程序上異步獲取進(jìn)度，但是我無法直接獲取值，所以我想我需要從我的 golang 應(yīng)用程序返回進(jìn)度的整數(shù)，但如果我這樣做，函數(shù)只執(zhí)行 1 次（進(jìn)度的最后結(jié)果）問題是如何讓我的 go func DownloadFile 在我的 C# 應(yīng)用程序上被調(diào)用 1 次，但我仍然可以跟蹤進(jìn)度？任何幫助將不勝感激，謝謝。func DownloadFile(){ // create client client := grab.NewClient() req, _ := grab.NewRequest(".", "http://www.golang-book.com/public/pdf/gobook.pdf") // start download fmt.Printf("Downloading %v...\n", req.URL()) resp := client.Do(req) fmt.Printf(" %v\n", resp.HTTPResponse.Status) // start UI loop t := time.NewTicker(500 * time.Millisecond) defer t.Stop()Loop: for { select { case <-t.C: fmt.Printf("%.2f%", //resp.BytesComplete(), //resp.Size, 100*resp.Progress()) case <-resp.Done: // download is complete break Loop } } // check for errors if err := resp.Err(); err != nil { fmt.Fprintf(os.Stderr, "Download failed: %v\n", err) os.Exit(1) } // fmt.Printf("Download saved to ./%v \n", resp.Filename) // Output: // Downloading http://www.golang-book.com/public/pdf/gobook.pdf... // 200 OK // transferred 42970 / 2893557 bytes (1.49%) // transferred 1207474 / 2893557 bytes (41.73%) // transferred 2758210 / 2893557 bytes (95.32%) // Download saved to ./gobook.pdf}
1 回答
斯蒂芬大帝
TA貢獻(xiàn)1827條經(jīng)驗 獲得超8個贊
所以，在谷歌搜索之后，我找到了答案，我需要像下面這樣在Go上使 setter 和 getter “類似” 。
var Progress int
var DownloadSpeed int
//export DownloadFile
func DownloadFile(){
// create client
client := grab.NewClient()
req, _ := grab.NewRequest(".", "https://upload.wikimedia.org/wikipedia/commons/d/d6/Wp-w4-big.jpg")
// start download
fmt.Printf("Downloading %v...\n", req.URL())
resp := client.Do(req)
fmt.Printf(" %v\n", resp.HTTPResponse.Status)
// start UI loop
t := time.NewTicker(500 * time.Millisecond)
defer t.Stop()
Loop:
for {
select {
case <-t.C:
//progress = 100*(resp.Progress())
SetProgressValue(int(resp.Progress() * 100))
SetDownloadSpeedValue(int(resp.BytesPerSecond()))
//fmt.Println(progress)
case <-resp.Done:
// download is complete
SetProgressValue(100)
//fmt.Println(Progress)
break Loop
}
}
// check for errors
if err := resp.Err(); err != nil {
fmt.Fprintf(os.Stderr, "Download failed: %v\n", err)
os.Exit(1)
}
fmt.Printf("Download saved to ./%v \n", resp.Filename)
fmt.Println("Completed")
}
//export ProgressValue
func ProgressValue() int {
return Progress
}
//export SetProgressValue
func SetProgressValue(val int) {
Progress = val
}
然后在C#中使用：
void worker_DoWork(object sender, DoWorkEventArgs e) {
[DllImport(@"M:\GolangProjects\PatcherDLL\patcher.dll", EntryPoint = "ProgressValue")]
static extern int ProgressValue();
public partial class MainWindow : Window {
var task = Task.Factory.StartNew(() => {
DownloadFile();
});
while (!task.IsCompleted)
{
Thread.Sleep(100);
string downloadSpeedFormatted = "";
if (DownloadSpeedValue()/1000 > 999)
{
downloadSpeedFormatted = Math.Round((double) DownloadSpeedValue() / 1000000, 2) + " MB/s";
} else
{
downloadSpeedFormatted = DownloadSpeedValue() / 1000 + " kb/s";
}
Dispatcher.BeginInvoke(new Action(delegate {
progressbar1.Value = ProgressValue();
progressPercent1.Text = ProgressValue() + "%";
downloadSpeeds.Content = downloadSpeedFormatted;
}));
}
}
}
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