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hooks/useImage.js

@@ -25,7 +25,129 @@ export function useImage() {
         })
     }
 
+    /**
+     * 获取图片信息
+     * @param src
+     * @returns {Promise<GetImageInfoSuccessData>}
+     */
+    function getImageInfo(src) {
+        return new Promise((resolve, reject) => {
+            uni.getImageInfo({
+                src,
+                success: (res) => {
+                    resolve(res)
+                },
+                fail: (error) => {
+                    reject(error)
+                }
+            })
+        })
+    }
+
+    /**
+     * base64转换为path
+     * @param base64Data
+     * @returns {Promise<unknown>}
+     */
+    function base64ToUrl(base64Data) {
+        return new Promise((resolve, reject) => {
+            // #ifdef H5
+            // 构建blob对象 data:image/png;base64,
+            const indexOf = base64Data.indexOf('base64,');
+            base64Data = base64Data.slice(indexOf + 7)
+            const byteCharacters = atob(base64Data);
+            const byteNumbers = new Array(byteCharacters.length);
+            for (let i = 0; i < byteCharacters.length; i++) {
+                byteNumbers[i] = byteCharacters.charCodeAt(i);
+            }
+            const byteArray = new Uint8Array(byteNumbers);
+            const blob = new Blob([byteArray], {type: 'image/png'});
+            // 创建一个链接指向这个blob
+            const url = URL.createObjectURL(blob);
+            resolve(url)
+            // #endif
+            // #ifdef MP-WEIXIN
+            const time = new Date().getTime();
+            const imgPath = wx.env.USER_DATA_PATH + "/poster" + time + "share" + ".png";
+            //如果图片字符串不含要清空的前缀,可以不执行下行代码.
+            const imageData = base64Data.replace(/^data:image\/\w+;base64,/, "");
+            const file = wx.getFileSystemManager();
+            file.writeFileSync(imgPath, imageData, "base64");
+            resolve(imgPath)
+            // #endif
+            // #ifdef APP-PLUS
+            const bitmap = new plus.nativeObj.Bitmap('test');
+            bitmap.loadBase64Data(
+                base64Data,
+                function () {
+                    const url = '_doc/' + new Date() + '.png'; // url建议用时间戳命名方式
+                    console.log('url:', url);
+                    bitmap.save(
+                        url,
+                        {
+                            overwrite: true // 是否覆盖
+                            // quality: 'quality'  // 图片清晰度
+                        },
+                        i => {
+                            resolve(url)
+                        },
+                        e => {
+                            bitmap.clear();
+                            reject(e)
+                        }
+                    );
+                },
+                e => {
+                    bitmap.clear();
+                    reject(e)
+                }
+            );
+            // #endif
+        })
+    }
+
+
+    /**
+     * 保存图片到相册
+     * @param filePath
+     * @param name h5海报名称
+     * @returns {Promise<unknown>}
+     */
+    function saveImageToPhotosAlbum(filePath, name = '') {
+        return new Promise((resolve, reject) => {
+            // #ifndef H5
+            uni.authorize({
+                scope: 'scope.writePhotosAlbum',
+                success() {
+                    uni.saveImageToPhotosAlbum({
+                        filePath,
+                        success() {
+                            resolve(true)
+                        }
+                    })
+                }
+            })
+            // #endif
+            // #ifdef H5
+            // 创建一个下载链接
+            const link = document.createElement('a');
+            link.href = filePath;
+            link.download = name;
+            // 添加它到DOM并触发点击
+            document.body.appendChild(link);
+            link.click();
+            // 确保我们释放这个URL以防止内存泄漏
+            document.body.removeChild(link);
+            window.URL.revokeObjectURL(filePath);
+            resolve(true)
+            // #endif
+        })
+    }
+
     return {
-        preview
+        preview,
+        getImageInfo,
+        base64ToUrl,
+        saveImageToPhotosAlbum
     }
 }