本文整理汇总了TypeScript中tns-core-modules/file-system.File.exists方法的典型用法代码示例。如果您正苦于以下问题：TypeScript File.exists方法的具体用法？TypeScript File.exists怎么用？TypeScript File.exists使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类tns-core-modules/file-system.File的用法示例。
在下文中一共展示了File.exists方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的TypeScript代码示例。
示例1: Promise
return new Promise((resolve, reject) => {
try {
const storageRef = getStorageRef(reject, arg);
if (!storageRef) {
return;
}
const storageReference = storageRef.child(arg.remoteFullPath);
const onSuccessListener = new com.google.android.gms.tasks.OnSuccessListener({
onSuccess: uploadTaskSnapshot => {
const metadata = uploadTaskSnapshot.getMetadata();
resolve({
name: metadata.getName(),
contentType: metadata.getContentType(),
created: new Date(metadata.getCreationTimeMillis()),
updated: new Date(metadata.getUpdatedTimeMillis()),
bucket: metadata.getBucket(),
size: metadata.getSizeBytes(),
// url: metadata.getDownloadUrl().toString()
});
}
});
const onFailureListener = new com.google.android.gms.tasks.OnFailureListener({
onFailure: exception => {
reject("Upload failed. " + exception);
}
});
const onProgressListener = new com.google.firebase.storage.OnProgressListener({
onProgress: snapshot => {
if (typeof(arg.onProgress) === "function") {
const fractionCompleted = snapshot.getBytesTransferred() / snapshot.getTotalByteCount();
arg.onProgress({
fractionCompleted: fractionCompleted,
percentageCompleted: Math.round(fractionCompleted * 100)
});
}
}
});
if (arg.localFile) {
if (typeof(arg.localFile) !== "object") {
reject("localFile argument must be a File object; use file-system module to create one");
return;
}
// using 'putFile' (not 'putBytes') so Firebase can infer the mimetype
const localFileUrl = android.net.Uri.fromFile(new java.io.File(arg.localFile.path));
storageReference.putFile(localFileUrl)
.addOnFailureListener(onFailureListener)
.addOnSuccessListener(onSuccessListener)
.addOnProgressListener(onProgressListener);
/*
var error;
var contents = arg.localFile.readSync(e => { error = e; });
if (error) {
reject("Error reading file " + arg.localFile + ": " + error);
return;
}
var uploadDataTask = storageReference.putBytes(contents)
.addOnFailureListener(onFailureListener)
.addOnSuccessListener(onSuccessListener)
.addOnProgressListener(onProgressListener);
*/
} else if (arg.localFullPath) {
if (!File.exists(arg.localFullPath)) {
reject("File does not exist: " + arg.localFullPath);
return;
}
const localFileUrl = android.net.Uri.fromFile(new java.io.File(arg.localFullPath));
storageReference.putFile(localFileUrl)
.addOnFailureListener(onFailureListener)
.addOnSuccessListener(onSuccessListener)
.addOnProgressListener(onProgressListener);
} else {
reject("One of localFile or localFullPath is required");
}
} catch (ex) {
console.log("Error in firebase.uploadFile: " + ex);
reject(ex);
}
});