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现在正在运作，请参阅下面的答案（https://stackoverflow.com/a/43983621/2844901）

这是我的getDrawing函数，我需要将签名从绘图保存到文件系统中的文件，我已经尝试了所有内容，但我无法在nativescript文档中获取saveToFile演示以使其正常工作。

exports.getDrawing = function(args) {

    var pad = frameModule.topmost().currentPage.getViewById("drawingPad");
    // then access the 'drawing' property (Bitmap on Android) of the signaturepad
    var img = frameModule.topmost().currentPage.getViewById("imagesignature");

    pad.getDrawing().then(function(result){
    img.src = result; // <-- this shows in an image label the drawing signature
    ########### this part should be save the file,but I don't get any error, and it doesn't save it to a file, when tried to dump "img" ############
     var img2 = imageSource.fromAsset(result);
     var folder = fs.knownFolders.documents();
     var path = fs.path.join(folder.path, "Test.png");
     var saved = img2.saveToFile(path, "png");


});

}

Answer 1

问题是，getDrawing（）没有返回一个它返回一个图像的promise，所以正确的代码应该是一个NativeSource。

pad.getDrawing().then(function(result){
    img.src = result;
    console.log("1");
    var img2 = imageSource.fromNativeSource(result);
    var folder = fs.knownFolders.documents();
    var path = fs.path.join(folder.path, "Test.png");
    var saved = img2.saveToFile(path, "png");
    console.log("saved: " + saved);
    console.log("IMAGEN SRC.....");
});

如何在nativescript中保存绘图板图像

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1 个答案: