Question

当我通过调用此例程创建CIImage时，我在标题中得到malloc错误。当我直接调用initWithBitmapData（不在createCIUimageFromData例程中）时，它工作正常。

我已经看到了iOS中可能存在的可能相关错误的引用，但我无法确定，我当然怀疑我的代码比Apple更多！

我的猜测在某种程度上是我的额外重定向搞砸了，但是拥有单独的例程比在任何我需要的地方嵌入代码更清晰。

谢谢。

失败：

- (CIImage *) createCIimageFromData : (unsigned char *)pData   width : (int32_t)width height : (int32_t)height
{

    /*
     Once we have the raw data, we convert it into a CIImage.
     The following code does the required work.
     */
    NSLog(@"entering createciimage\n");
    CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceGray();

    NSData *_pixelsData = [NSData dataWithBytesNoCopy:pData length:(sizeof(unsigned char)*width*height) freeWhenDone:YES ];
    CIImage *_dataCIImage = [[CIImage alloc] initWithBitmapData:_pixelsData bytesPerRow:(width*sizeof(unsigned char)) size:CGSizeMake(width,height) format:kCIFormatR8 colorSpace:colorSpaceRef];

    CGColorSpaceRelease(colorSpaceRef);

    /*
     newImage is the final image
     Do remember to release the allocated parts.
     */
    NSLog(@"done ciimage\n");
    return _dataCIImage;
}

使用：

void prepData(unsigned char *pData,  // source-destination
                           int strideSrc, // stride
                           int width,
                           int height,
                           double amount,
                           int deltaLimit,
                           id owner)
{

   //[owner createCIimageFromData:pData width:width height:height];  // <-- commented out
    CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceGray();

    NSData *_pixelsData = [NSData dataWithBytesNoCopy:pData length:(sizeof(unsigned char)*width*height) freeWhenDone:YES ];
    CIImage *_dataCIImage = [[CIImage alloc] initWithBitmapData:_pixelsData bytesPerRow:(width*sizeof(unsigned char)) size:CGSizeMake(width,height) format:kCIFormatR8 colorSpace:colorSpaceRef];

    CGColorSpaceRelease(colorSpaceRef);

// . . .
}

Answer 1

显然，var data = [ { x: [0, 1, 1, 0], y: [0, 0, 1, 1], z: [0, 0, 1, 1], type: 'contour', colorscale: 'Jet', showscale: false, autocontour: true }]; var layout = { margin: { b: 0, l: 0, r: 0, t: 0 }, height: 600, width: 600, title: '', xaxis: { ticks: '', showticklabels: false }, yaxis: { ticks: '', showticklabels: false } }; Plotly.newPlot('graph', data, layout, {displayModeBar: false});对象尝试释放数据时会导致问题。要避免此问题，请使用NSData，然后在完成freeWhenDone:NO后释放数据。

调用initWithBitmapData时，释放的malloc指针未分配错误

1 个答案: