printf出错并且不显示结果 [英] printf makes error and don't show the result

问题描述

我在opencl中的printf有问题 这是我的代码的一部分:

i have problem with the printf in opencl this is the part of my code :

clGetEventProfilingInfo(timing_event, CL_PROFILING_COMMAND_START,
sizeof(time_start), &time_start, NULL);
clGetEventProfilingInfo(timing_event, CL_PROFILING_COMMAND_END,sizeof(time_end),
&time_end, NULL);
total_time = time_end - time_start;
printf("\nAverage Time In Nanoseconds  = %lu\n" , total_time );

我已经声明了这样的变量:

and i have declared variables like this :

cl_event timing_event;
cl_ulong time_start, time_end;
cl_ulong total_time;

但是当我编译程序mingw32-gcc时会出现此错误:

but when i compile the program mingw32-gcc makes this error :

format %lu expects argument of type 'long unsigned int' but argument 2 has type 'cl_ulong' 
[-Wformat]

并且* .exe无法运行.那有什么身体可以帮助我吗?我对这个错误很困惑！！！

and the *.exe does't run . so is there any body help me ? i am so confused about this error !!!

推荐答案

cl_ulong在cl_platform中定义为:

cl_ulong is defined in cl_platform as:

typedef unsigned __int64 cl_ulong;

因此％llu是正确的.要使％llu与mingw一起使用，请在包含文件之前添加以下行:

So %llu is correct. To make %llu work with mingw, add this line before your include files:

#define __USE_MINGW_ANSI_STDIO 1

没有此定义，您必须使用非标准的Microsoft等效项％I64u.

Without this definition, you have to use the non-standard Microsoft equivalent, %I64u.

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