compatibility

问题 I'm in the early stages of an iPhone app and I have a question. I did some searching but did not find what I was looking for. There are features in iPhone OS4 that I would like to take advantage of, but I would like for my app to also run on 3.X. It looks like I want to develop against the 4.0 SDK and do the following: Create a "weak link" to any new (4.0) frameworks Call respondsToSelector: for any new method in an existing framework or any method in a new framework before making that call

问题 When Stroustroup was designing C++, one of his goals was that C++ were as much a superset of C as possible. I understand that this is not 100% the case, but most of good code in C is also C++ code. But I am hearing that C99 supports many things that C++ doesn't (like VLA) and that there is even going to be C1x or C0x whatever it's called. So, C++ is a superset of only old C89 and from then on C and C++ are developing pretty much independently? 回答1: C++ is a near superset of C89/C90. (I don't

问题 Does anyone know of a definitive guide or guides that tells us the differences between WPF and Silverlight. I know that Silverlight, for example, doesn’t have all the controls and all the namespaces that WPF has. Is there a source which tells me exactly what controls and namespaces are absent in Silverlight? There are other things that I know off the top of my head, like only allowing asynchronous communications using basic http binding. Also, Silverlgiht doesn’t have all of the type

问题 Is there any way I can call CUDA runtime function calls such as cudaMemcpy(...); in a .cpp file, compiled with a regular C++ compiler? 回答1: EDIT: There was an example here but it's not longer found, but most of the example was copied below. The caller C (but could be C++) #include <stdio.h> #include <stdlib.h> #include <string.h> #include <cuda.h> extern void kernel_wrapper(int *a, int *b); int main(int argc, char *argv[]) { int a = 2; int b = 3; kernel_wrapper(&a, &b); return 0; } The Callee

问题 I have a legacy business application built on MS SQL Server 2000. I have some webbased utilities that access this database using PHP 5.2 with mssql extension. I need to reinstall the web server, and I looked forward to upgrade to PHP 5.4. Unfortunately, the mssql extension is not supported on PHP 5.3 and newer. There is the sqlsrv extension available form Microsoft, but the description says that it is only supported for accessing SQL server 2005 and up. How can I connect to my SQL Server 2000

问题 I have a legacy business application built on MS SQL Server 2000. I have some webbased utilities that access this database using PHP 5.2 with mssql extension. I need to reinstall the web server, and I looked forward to upgrade to PHP 5.4. Unfortunately, the mssql extension is not supported on PHP 5.3 and newer. There is the sqlsrv extension available form Microsoft, but the description says that it is only supported for accessing SQL server 2005 and up. How can I connect to my SQL Server 2000

问题 I have just found something very weird while developing a website. While trying to get a div element to display across the top of the screen, I noticed that I wasn't achieving a desired result in any browser except for old versions of IE. In order to test some different code, instead of deleting the faulty line, I used '//' to comment it out (I'm not really even sure if that works in css) but what happened was, the compatible browsers used the uncommented code, while IE used the code marked

问题 I've heard that objective-C is a proper superset of C, but is objective-C 2.0? The reason I ask is that either it isn't, or I misunderstand the phrase 'proper superset', because this code is valid C syntax: #import <stdio.h> int main () { char *nil = "hello"; printf("%s\n",nil); } But does not compile in Objective-C 2.0. Obviously, this is an easily fixable problem, but I'm writing a paper, and feel that this is something that should be pointed out. 回答1: nil is not a keyword. nil is defined

问题 I am aware of how to force IE into viewing a page in document compatibility , but what about browser compatibility view? I have a project that only works when IE9 is in browser compatibility view for various reasons, yet I can't find any resources on how to force IE9 to do so. Everyone only talks about forcing the document compatibility, e.g. using <meta http-equiv="X-UA-Compatible" content="IE=8" /> But that doesn't work in my case, because it only sets the document view . Is there a way to

问题 I'm currently writing a bash testing framework, which requires to be as portable as possible. So, at one point, I had to print a leading newline followed by some text which contains several expanded variables. This is the solution I've used. echo -e "\n$number_of_specs ${units}, $number_of_specs_failed failed" This seems okay but I'm not sure how portable that is compared to printing out the line using e.g. printf ? Any ideas or hints where I could find some references? 回答1: printf is more