不幸的是,您无法从Cordova相机插件中提取BLOB
。
获得BLOB
的方法是将base64编码的字符串转换为BLOB
并使用它。
下面是一个方法(符合ES6),允许您将BLOB
和sliceSize转换为更高的内存效率。
/**
* Turn base 64 image into a blob, so we can send it using multipart/form-data posts
* @param b64Data
* @param contentType
* @param sliceSize
* @return {Blob}
*/
private getBlob(b64Data:string, contentType:string, sliceSize:number= 512) {
contentType = contentType || '';
sliceSize = sliceSize || 512;
let byteCharacters = atob(b64Data);
let byteArrays = [];
for (let offset = 0; offset < byteCharacters.length; offset += sliceSize) {
let slice = byteCharacters.slice(offset, offset + sliceSize);
let byteNumbers = new Array(slice.length);
for (let i = 0; i < slice.length; i++) {
byteNumbers[i] = slice.charCodeAt(i);
}
let byteArray = new Uint8Array(byteNumbers);
byteArrays.push(byteArray);
}
let blob = new Blob(byteArrays, {type: contentType});
return blob;
}