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c++ - argc 是什么意思?

转载 作者:太空狗 更新时间:2023-10-29 23:22:49 28 4
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我不明白,OpenCV 中用于加载图像的代码的功能是什么。 if(argc !=2) 的功能是什么?你能告诉我吗?

 if( argc != 2)
{
cout <<" Usage: display_image ImageToLoadAndDisplay" << endl;
return -1;
}

完整代码:

1 #include <opencv2/core/core.hpp>
2 #include <opencv2/highgui/highgui.hpp>
3 #include <iostream>
4
5 using namespace cv;
6 using namespace std;
7
8 int main( int argc, char** argv )
9 {
10 if( argc != 2)
11 {
12 cout <<" Usage: display_image ImageToLoadAndDisplay" << endl;
13 return -1;
14 }
15
16 Mat image;
17 image = imread(argv[1], CV_LOAD_IMAGE_COLOR); // Read the file
18
19 if(! image.data ) // Check for invalid input
20 {
21 cout << "Could not open or find the image" << std::endl ;
22 return -1;
23 }
24
25 namedWindow( "Display window", CV_WINDOW_AUTOSIZE );// Create a window for display.
26 imshow( "Display window", image ); // Show our image inside it.
27
28 waitKey(0); // Wait for a keystroke in the window
29 return 0;
30 }

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