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Xcode 'Build and Archive' menu item disabled
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Build configiuration setting needs to be an "iOS Device" (or any specific device if connected) to activate "Product → Archive" menu item. For some strange reason when any kind of iOS Simulator is selected, Archive is greyed out.
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Click Event on UIImageView programmatically in ios
...gnizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapDetected)];
singleTap.numberOfTapsRequired = 1;
[preArrowImage setUserInteractionEnabled:YES];
[preArrowImage addGestureRecognizer:singleTap];
-(void)tapDetected{
NSLog(@"single Tap on imageview");
}
...
Swift: Determine iOS Screen size [duplicate]
I would like to use Swift code to properly position items in my app for no matter what the screen size is. For example, if I want a button to be 75% of the screen wide, I could do something like (screenWidth * .75) to be the width of the button. I have found that this could be determined in Object...
C++程序结果出现1.#inf 1.#IO - C/C++ - 清泛IT论坛，有思想、有深度
表象原因：浮点数越界了（超过FLT_MAX最大值了），1.#IO是 %lf 格式化出来的字符串。
极可能原因：除0了，也就是f1 = f2 / 0。
做任何除法时，分母为零的判断不可少。
研究：[url]https://peterzhong1219.gitee.io/webpages/%E5%A6%82%E4%BD%95...
研究：https://peterzhong1219.gitee.io/ ... App%20Inventor.htmlhttps://qastack.cn/programming/1 ... up-the-gwt-compiler已研究，已解决问题。
动态创建对象的拓展：[url]https://community.kodular.io/t/f-os-dynamic-c...
动态创建对象的拓展：https://community.kodular.io/t/f ... onent-2-2-2/50789/2已添加，待翻译优化
【拍照图片处理】Attempt to invoke virtual method 'boolean android.grap...
...graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference
图片大致的处理流程是：先TaifunImage压缩尺寸，在Base64化，调在线api进行识别。
通过调试发现问题是出现在 图片的Resize/Base64化的步...
Attempt to invoke virtual method 'boolean android.graphics.Bitmap.comp...
...graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference
原因：调用 TaifunImage 时给定的图片路径为空导致的。
解决：指定有效的图片路径，或者拍照返回的图片路径，或者图像选择器选...
Reading a file line by line in Go
I'm unable to find file.ReadLine function in Go. I can figure out how to quickly write one, but I am just wondering if I'm overlooking something here. How does one read a file line by line?
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Reading and writing binary file
...algorithm>
int main()
{
std::ifstream input( "C:\\Final.gif", std::ios::binary );
std::ofstream output( "C:\\myfile.gif", std::ios::binary );
std::copy(
std::istreambuf_iterator<char>(input),
std::istreambuf_iterator<char>( ),
std::ostreambuf_it...