问题描述
我的快速外观生成器曾经可以正常工作，但是现在坏了.
是错误还是我做错了什么?
My quick look generator used to work properly but is now broken.
Is it a bug or am I doing something wrong?
这是我的代码:
OSStatus GeneratePreviewForURL(void *thisInterface, QLPreviewRequestRef preview,
CFURLRef url, CFStringRef contentTypeUTI,
CFDictionaryRef options) {
NSDictionary * myDoc = [NSDictionary dictionaryWithContentsOfURL:(NSURL *)url];
if (myDoc) {
NSData * pngData = [myDoc valueForKey:@"pngPreview"];
if (pngData) {
QLPreviewRequestSetDataRepresentation(preview,(__bridge CFDataRef)pngData,
kUTTypeImage,NULL);
}
}
}
我的文档是普通的plist，其中将png预览存储为数据.
我检查了pngPreview是否包含png数据，并创建了图像，其尺寸为350×350.
My doc is a normal plist with a png preview stored as data in it.
I checked that pngPreview does contain png data, I created the image and its size was 350×350.
但是，我不断遇到这些错误:
However, I’m constantly getting these errors:
qlmanage[702] : CGImageCreate: invalid image size: 0 x 0.
qlmanage[702:303] *** CFMessagePort: bootstrap_register(): failed 1100 (0x44c) 'Permission denied', port = 0x9e27, name = 'com.apple.tsm.portname'
See /usr/include/servers/bootstrap_defs.h for the error codes.
qlmanage[702:303] *** CFMessagePort: bootstrap_register(): failed 1100 (0x44c) 'Permission denied', port = 0x3f2b, name = 'com.apple.CFPasteboardClient'
See /usr/include/servers/bootstrap_defs.h for the error codes.
qlmanage[702:303] Failed to allocate communication port for com.apple.CFPasteboardClient; this is likely due to sandbox restrictions我的应用未经过沙箱测试，因此我认为最后3个错误并不重要.
My app is not sandboxed so I don’t think the last 3 errors are important.
我曾经使用过kUTTypePNG，但没有尝试过kUTTypeImage(QLPreviewRequestSetDataRepresentation的文档说，当前支持的UTI是kUTTypeImage，kUTTypePDF，kUTTypeHTML，kUTTypeXML，kUTTypePlainText，kUTTypeRTF，kUTTypeMovie和kUTTypeAudio).
I used to use kUTTypePNG but have tried kUTTypeImage to no avail (the docs for QLPreviewRequestSetDataRepresentation says currently supported UTIs are kUTTypeImage, kUTTypePDF, kUTTypeHTML, kUTTypeXML, kUTTypePlainText, kUTTypeRTF, kUTTypeMovie, and kUTTypeAudio).
要考虑的其他要点:文档状态:"Quick Look生成器的二进制文件必须是通用的，并且只能是32位." 此页面但是此页面指出: 对于OS X v10.6和更高版本，必须为32位和64位都构建Quick Look生成器."哪个还不清楚...
我该如何设定目标?
Other points to consider:The docs state:"The binary of a Quick Look generator must be universal and must be 32-bit only." This pageBut this page states: "For OS X v10.6 and later, you must build Quick Look generators for both 32- and 64-bit." Which is rather unclear...
How do I set my target?
推荐答案
面对相同的问题，我决定采用另一种方法:使用QLPreviewRequestCreateContext获取在其中绘制图像的上下文:
Facing the same problem I've decided to go an alternate route: use QLPreviewRequestCreateContext to get a context in which to draw my image in:
QLPreviewRequestRef preview; // The preview request passed to GeneratePreviewForURL()
CGImageRef image; // Create your CGImage however you like
CGSize size = CGSizeMake(CGImageGetWidth(image), CGImageGetHeight(image));
CGContextRef ctxt = QLPreviewRequestCreateContext(preview, size, YES, nil);
CGContextDrawImage(ctxt, CGRectMake(0, 0, size.width, size.height), image);
QLPreviewRequestFlushContext(preview, ctxt);
CGContextRelease(ctxt);
至少行得通...
这篇关于为什么Mavericks上的QLPreviewRequestSetDataRepresentation返回错误"CGImageCreate:图片大小无效:0 x 0"对于png的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！