小编Ike*_*nsa的帖子

嗨所以我写了这段代码来捕获文件中的视频

#include <stdio.h>
#include <cv.h>
#include "highgui.h"
#include <iostream>

//using namespace cv

int main(int argc, char** argv)
{
    CvCapture* capture=0;
    IplImage* frame=0;
    capture = cvCaptureFromAVI(char const* filename); // read AVI video    
    if( !capture )
        throw "Error when reading steam_avi";

    cvNamedWindow( "w", 1);
    for( ; ; )
    {
        frame = cvQueryFrame( capture );
        if(!frame)
            break;
        cvShowImage("w", frame);
    }
    cvWaitKey(0); // key press to close window
    cvDestroyWindow("w");
    cvReleaseImage(&frame);
}

每次我运行它,我都会收到以下错误:

CaptureVideo.cpp:在函数'int main(int,char**)'中:

CaptureVideo.cpp:13:28:错误:在'char'之前预期的primary-expression

任何帮助都感激不尽.

我正在尝试比较输入值.这是我想说的样本.

           if(text.input != float)
           {
              //code to calculate
           }

我不想允许输入数字以外的值.它是否正确？