所以,我正在使用这个cordova相机插件使用相机拍照。由于我的应用程序有将近10个div会激活相机,我想要配置服务器以获取我发送的二进制字符串的大小。我尝试了以下代码,它打印了二进制字符串而不是文件大小
navigator.camera.getPicture(onSuccess, onFail, { quality: 50,
destinationType: Camera.DestinationType.DATA_URL
});
function onSuccess(imageData) {
//var finalimage = "data:image/jpeg;base64," + imageData;
window.resolveLocalFileSystemURI(imageData, function(fileEntry) {
fileEntry.file(function(fileObj) {
console.log("Size = " + fileObj.size);
});
});
这段代码给了我很棒的二进制字符串作为输出而不是文件大小。现在我也有另一个问题,在上面的评论中我将图像转换为base 64,那么会有change in the file size between final image and imageData
吗?
答案 0 :(得分:-1)
使用功能
var pictureSource; // picture source
var destinationType; // sets the format of returned value
// Wait for device API libraries to load
//
document.addEventListener("deviceready", onDeviceReady, false);
// device APIs are available
//
function onDeviceReady() {
pictureSource = navigator.camera.PictureSourceType;
destinationType = navigator.camera.DestinationType;
function capturePhotoEdit() {
// Take picture using device camera, allow edit, and retrieve image as base64-encoded string
navigator.camera.getPicture(onPhotoDataSuccess, onFail, {
quality: 20,
allowEdit: true,
destinationType: destinationType.DATA_URL
});
}

并在功能中使用"允许编辑"
您将获得完整的编辑和裁剪选项。 !!
var pictureSource; // picture source
var destinationType; // sets the format of returned value
// Wait for device API libraries to load
//
document.addEventListener("deviceready", onDeviceReady, false);
// device APIs are available
//
function onDeviceReady() {
pictureSource = navigator.camera.PictureSourceType;
destinationType = navigator.camera.DestinationType;
}
// Called when a photo is successfully retrieved
//
var x = 0;
function onPhotoDataSuccess(imageURI) {
x++;
// Uncomment to view the base64-encoded image data
console.log(imageURI);
alert(imageURI);
// Get image handle
//
var y = 'smallImage' + x;
var smallImage = document.getElementById(y);
// Unhide image elements
//
smallImage.style.display = 'block';
// Show the captured photo
// The in-line CSS rules are used to resize the image
//
smallImage.src = "data:image/jpeg;base64," + imageURI;
}
// Called when a photo is successfully retrieved
//
var z = 0;
function onPhotoURISuccess(imageURI) {
z++;
// Uncomment to view the image file URI
console.log(imageURI);
alert(imageURI);
// Get image handle
//
var w = 'largeImage' + z;
var largeImage = document.getElementById(w);
// Unhide image elements
//
largeImage.style.display = 'block';
// Show the captured photo
// The in-line CSS rules are used to resize the image
//
largeImage.src = imageURI;
}
// A button will call this function
//
function capturePhoto() {
// Take picture using device camera and retrieve image as base64-encoded string
navigator.camera.getPicture(onPhotoDataSuccess, onFail, {
quality: 50,
destinationType: destinationType.DATA_URL
});
}
// A button will call this function
//
function capturePhotoEdit() {
// Take picture using device camera, allow edit, and retrieve image as base64-encoded string
navigator.camera.getPicture(onPhotoDataSuccess, onFail, {
quality: 20,
allowEdit: true,
destinationType: destinationType.DATA_URL
});
}
// A button will call this function
//
function getPhoto(source) {
// Retrieve image file location from specified source
navigator.camera.getPicture(onPhotoURISuccess, onFail, {
quality: 50,
allowEdit: true,
destinationType: destinationType.FILE_URI,
sourceType: source
});
}
// Called if something bad happens.
//
function onFail(message) {
alert('Failed because: ' + message);
}