I tried using How to load JPG file into NSBitmapImageRep? to answer my question but I get:
我尝试使用如何将JPG文件加载到NSBitmapImageRep中？回答我的问题，但我得到：
"incompatible pointer types initializing 'nsbitmapimagerep *' with an expression of type 'nsimagerep *'". with respect to:
“不兼容的指针类型初始化'nsbitmapimagerep *'，表达式为'nsimagerep *'”。关于：
NSImage *controlImage = [[NSImage alloc] initWithContentsOfFile:filePath];
NSBitmapImageRep *imageRep = [[controlImage representations] objectAtIndex:0]; //"incompatible pointer types initializing 'nsbitmapimagerep *' with an expression of type 'nsimagerep *'"
2 个解决方案
#1
1
The compiler is right. The representions of an NSImage are an NSArray of NSImageRep (see the docs):
编译器是对的。 NSImage的代表是NSImageRep的NSArray（参见文档）：
@property(readonly, copy) NSArray <NSImageRep *> *representations
The compiler message is only a warning, so you could cast the second line and use the direct way (without using an NSImage) to get an NSBitmapImageRep:
编译器消息只是一个警告，因此您可以强制转换第二行并使用直接方式（不使用NSImage）来获取NSBitmapImageRep：
NSBitmapImageRep *imageRep =
(NSBitmapImageRep *)[NSBitmapImageRep imageRepWithContentsOfFile:filePath];
Another way avoiding the (a bit ugly casting) is:
避免（有点难看的铸造）的另一种方法是：
NSData *imgData = [NSData dataWithContentsOfFile:filePath];
NSBitmapImageRep *imageRep = [NSBitmapImageRep imageRepWithData:imgData];
Warning: this version does NOT evaluate an @2 etc. in the filePath!
警告：此版本不评估filePath中的@ 2等！
#2
0
NSBitmapImageRep is a subclass of NSImageRep, which is "semiabstract". NSImage can store other kinds of representations, too -- like NSEPSImageRep, for EPS images.
NSBitmapImageRep是NSImageRep的子类，它是“semiabstract”。 NSImage也可以存储其他类型的表示 - 如NSEPSImageRep，用于EPS图像。
If you're sure it's a bitmap, you should be able to simply cast it.
如果您确定它是位图，您应该能够简单地投射它。
#1
1
The compiler is right. The representions of an NSImage are an NSArray of NSImageRep (see the docs):
编译器是对的。 NSImage的代表是NSImageRep的NSArray（参见文档）：
@property(readonly, copy) NSArray <NSImageRep *> *representations
The compiler message is only a warning, so you could cast the second line and use the direct way (without using an NSImage) to get an NSBitmapImageRep:
编译器消息只是一个警告，因此您可以强制转换第二行并使用直接方式（不使用NSImage）来获取NSBitmapImageRep：
NSBitmapImageRep *imageRep =
(NSBitmapImageRep *)[NSBitmapImageRep imageRepWithContentsOfFile:filePath];
Another way avoiding the (a bit ugly casting) is:
避免（有点难看的铸造）的另一种方法是：
NSData *imgData = [NSData dataWithContentsOfFile:filePath];
NSBitmapImageRep *imageRep = [NSBitmapImageRep imageRepWithData:imgData];
Warning: this version does NOT evaluate an @2 etc. in the filePath!
警告：此版本不评估filePath中的@ 2等！
#2
0
NSBitmapImageRep is a subclass of NSImageRep, which is "semiabstract". NSImage can store other kinds of representations, too -- like NSEPSImageRep, for EPS images.
NSBitmapImageRep是NSImageRep的子类，它是“semiabstract”。 NSImage也可以存储其他类型的表示 - 如NSEPSImageRep，用于EPS图像。
If you're sure it's a bitmap, you should be able to simply cast it.
如果您确定它是位图，您应该能够简单地投射它。