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What is wrong with this C++ Code? [closed]

开发者 https://www.devze.com 2022-12-23 14:22 出处:网络
开发者_如何学编程 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time,or an extraordinarily narrow situation that is not
开发者_如何学编程 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 9 years ago.

i am a beginner and i have a problem :

this code doesnt compile :

main.cpp:

#include <stdlib.h>
#include "readdir.h"
#include "mysql.h"
#include "readimage.h"


int main(int argc, char** argv) {
    if (argc>1){
    readdir(argv[1]);
  //  test();
    return (EXIT_SUCCESS);
    }
    std::cout << "Bitte Pfad angeben !" << std::endl ;
    return (EXIT_FAILURE);
}

readimage.cpp

#include <Magick++.h>
#include <iostream>
#include <vector>

using namespace Magick; using namespace std;

void readImage(std::vector<string> &filenames) {
    for (unsigned int i = 0; i < filenames.size(); ++i) {
        try {
            Image img("binary/" + filenames.at(i));

            for (unsigned int y = 1; y < img.rows(); y++) {
                for (unsigned int x = 1; x < img.columns(); x++) {
                    ColorRGB rgb(img.pixelColor(x, y));
                    // cout << "x: " << x << "   y: " << y << " : "  << rgb.red() << endl;
                }
            }
            cout << "done " << i << endl;
        } catch (Magick::Exception & error) {
            cerr << "Caught Magick++ exception: " << error.what() << endl;
        }
    } }

readimage.h

#ifndef _READIMAGE_H
#define _READIMAGE_H

#include <Magick++.h>
#include <iostream>
#include <vector>
#include <string>

using namespace Magick;
using namespace std;

void readImage(vector<string> &filenames)


#endif  /* _READIMAGE_H */

If want to compile it with this code :

g++ main.cpp Magick++-config --cflags --cppflags --ldflags --libs readimage.cpp

i get this error message :

main.cpp:5: error: expected initializer before ‘int’

i have no clue , why ? :(

Can somebody help me ? :)


In readimage.h, you are missing a semicolon after your readImage function declaration.


One of the first things you should do when compiling for the first time is to try one piece of code at a time. Don't throw a bunch of code together and hope that it compiles. Instead, take it one fragment at a time. So here, you might comment out your includes and the code that you expect to use the stuff in those files.

At first glance, it looks like

void readImage(vector<string> &filenames)

is missing a semicolon at the end of the line, since you're declaring it.


In readImage.h, you're missing a semicolon after the readImage function prototype.


This function declaration:

void readImage(vector<string> &filenames)

is missing a semicolon at the end. An unrelated issue - your include guard names:

#ifndef _READIMAGE_H

are illegal. Names that begin with an underscore and an uppercase letter are reserved in C++ - you are not allowed to create such names yourself.

And in your loop:

for (unsigned int y = 1; y < img.rows(); y++) {

are you sure you should be beginning the loop at 1 and not at zero?


; is missing at the end of readimage.h

Since, main.cpp is pre-processed first, it finds the error at the last line of readimage.h and shows that error occurred before int in main.cpp

main.cpp:5: error: expected initializer before ‘int’


You just need a semicolon at the end of readImage declaration in readimage.h:

void readImage(vector<string> &filenames);
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