Error C4996: 'fopen': This function or variable may be unsafe. in VS2015.

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最新推荐文章于 2025-05-26 17:36:43 发布

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本文描述了在使用OpenCV 3.2.0rc版本时遇到的fopen函数安全性警告，特别是在Windows 10 64位系统下使用Visual Studio 2015 Update 3编译时。提供了详细的错误信息及源代码位置，并展示了如何通过使用fopen_s替代fopen来解决此问题，以避免潜在的安全风险。

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System information (version)

OpenCV => 3.2.0 rc (Latest version)
Operating System / Platform => Windows10 64bit
Compiler => Visual Studio 2015 Update3

Detailed description

Source: %OPENCV_PATH%\include\opencv2\flann\logger.h 67
Error C4996 'fopen': This function or variable may be unsafe. Consider using fopen_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

Steps to reproduce

Build below code with opencv_flann.

#include <Windows.h>
#include <opencv2/opencv.hpp>

void main(int argc, char* argv[])
{
}

int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrev, LPSTR lpCmd, int nCmd)
{
    main(0,NULL);
}

logger.h : Original code.

stream = fopen(name,"w");
if (stream == NULL) {
    stream = stdout;
}

logger.h : Fixed code.

 #if _MSC_VER >= 1500
     errno_t error;
     error = fopen_s(&stream, name, "w");
     if (error != 0) {
         stream = stdout;
     }
 #else
     stream = fopen(name,"w");
     if (stream == NULL) {
         stream = stdout;
     }
 #endif