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testWidget::testWidget(QWidget *parent):QWidget(parent)
{
    setFixedSize(600, 400);
 
    QPushButton *btnCreateFlist = new QPushButton(tr("createFlist"),this);
    btnCreateFlist->setGeometry(100, 100, 200, 150);
    btnCreateFlist->setFont(QFont("Times", 18, QFont::Bold));
 
    showString = new QLabel;
    showString->setText(tr("Hello QT!"));
    showString->setGeometry(200,100,100,20);
    showString->setFont(QFont("Times", 12, QFont::Bold));
 
    rCaliImgLOG = new QLabel;
    rCaliImgLOG->setText(tr("CaliBration Image Read"));
    rCaliImgLOG->setGeometry(200,160,100,60);
    rCaliImgLOG->setFont(QFont("Times",12,QFont::Thin));
 
 
    QSlider *slider = new QSlider(Qt::Horizontal);
    slider->setRange(0, 99);
    slider->setValue(0);
 
 
    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(showString);
    layout->addWidget(rCaliImgLOG);
    layout->addWidget(slider);
    layout->addWidget(btnCreateFlist);
 
    setLayout(layout);
 
    QObject::connect(btnCreateFlist, SIGNAL(clicked()) , this, SLOT(createFilst()));
 
 
}
 
void testWidget:: createFilst()
{
FILE *img_txt;
FILE *rFolderList, *rFileList, *rImg, *wImg;
char sys_cmd[200], folderName[200], fileName[200], fileAddr[500];
char new_fileAddr[200];
unsigned char header[1078]={0}, times=0;//, img_ori2[RES_1016_IMAGE_SIZE]={0}
unsigned long width, height;
 
//read Calibration Image
 
    testWidget::readCaliImg("Calibration.y");
 
    cout<<testWidget::caliImgName<<endl;
 
    sprintf(sys_cmd,"dir /A:D /b t* >  folder_list.txt");
    system(sys_cmd);
 
    sprintf(sys_cmd,"md newProc");
    system(sys_cmd);
 
    rFolderList = fopen("folder_list.txt", "rt");
 
    while(EOF!=fscanf(rFolderList,"%s",folderName))
    {
        sprintf(sys_cmd,"md newProc\\%s",folderName);
        system(sys_cmd);
 
        sprintf(sys_cmd,"dir /b %s\\*.bmp > file_list.txt", folderName);
        system(sys_cmd);
 
        rFileList = fopen("file_list.txt","rt");
 
        while(EOF!=fscanf(rFileList,"%s",fileName))
        {
//            for(int i=0; i<RES_1016_IMAGE_SIZE; i++)
//            {
//                img_ori[i] = 0;
//                img_dst[i] = 0;
//            }
            img_txt=fopen("img.txt","wt");
 
            sprintf(fileAddr,"%s\\%s",folderName,fileName);
            sprintf(new_fileAddr,"newProc\\%s\\%s",folderName,fileName);
            rImg = fopen(fileAddr,"rb");
 
            if(rImg == NULL)
            {
//                showString->setText(tr("Read File ERROR!!!"));
                showString->setText(tr(fileAddr));
            }
            showString->setText(tr(fileAddr));
            wImg = fopen(new_fileAddr,"wb");
 
            fread(header,sizeof(unsigned char),1078,rImg);
            fwrite(header,sizeof(unsigned char),1078,wImg);
 
            fseek(rImg,18,SEEK_SET);
            fread(&width,sizeof(unsigned long),1,rImg);
            fread(&height,sizeof(unsigned long),1,rImg);
            fseek(rImg,1078,SEEK_SET);
 
//            if(times==0)
//            {
//                img_ori=(unsigned char*)malloc(width*height*sizeof(unsigned char));
//                img_dst=(unsigned char*)malloc(width*height*sizeof(unsigned char));
//                times++;
//            }
 
 
 
            fread(img_ori,sizeof(unsigned char),width*height, rImg);
 
            testWidget::imgProc();
//            inverseImage((int)width, (int)height, img_ori, img_dst);
//            applyISP((int)width, (int)height, img_ori, img_dst,  caliImg);//
            for(int i=0; i<(int)(width*height); i++)
            {
//                img_dst[i]=img_ori[i];
                fprintf(img_txt, "%03d\t", img_dst[i]);
            }
 
            fwrite(img_dst,sizeof(unsigned char),width*height, wImg);
 
            fclose(rImg);
            fclose(wImg);
            fclose(img_txt);
        }
//        showString->setText(tr(fileName));
    }
 
    fclose(rFolderList);
    fclose(rFileList);
 
 
//    free(img_ori);
//    free(img_dst);
 
}
 
void testWidget::readCaliImg(string caliImgName)//char *caliImgName
{
FILE *rCaliImg;
 
    rCaliImg=fopen(caliImgName.c_str(),"rb");   //string to char[] -> caliImgName.c_str()
//    rCaliImg=fopen(caliImgName,"rb");
 
    if(rCaliImg == NULL)
        rCaliImgLOG->setText(rCaliImgLOG->text() + " Error!");
    else
        rCaliImgLOG->setText(rCaliImgLOG->text() + " Success!");
 
    fread(caliImg,sizeof(unsigned char),RES_1016_IMAGE_SIZE,rCaliImg);
 
    fclose(rCaliImg);
}
 
 
void testWidget::imgProc()//
{
 
    showString->setText(tr("Doing imgProc!!!!!!!!!!!!!!!!"));
 
	for(int i=0; i<(int)(width*height); i++)
    {
        img_dst[i]=(unsigned char)255;
 
    }
 
}

prog.cpp:1:1: error: ‘testWidget’ does not name a type
 testWidget::testWidget(QWidget *parent):QWidget(parent)
 ^~~~~~~~~~
prog.cpp:38:6: error: ‘testWidget’ has not been declared
 void testWidget:: createFilst()
      ^~~~~~~~~~
prog.cpp: In function ‘void createFilst()’:
prog.cpp:40:1: error: ‘FILE’ was not declared in this scope
 FILE *img_txt;
 ^~~~
prog.cpp:40:7: error: ‘img_txt’ was not declared in this scope
 FILE *img_txt;
       ^~~~~~~
prog.cpp:41:7: error: ‘rFolderList’ was not declared in this scope
 FILE *rFolderList, *rFileList, *rImg, *wImg;
       ^~~~~~~~~~~
prog.cpp:41:21: error: ‘rFileList’ was not declared in this scope
 FILE *rFolderList, *rFileList, *rImg, *wImg;
                     ^~~~~~~~~
prog.cpp:41:33: error: ‘rImg’ was not declared in this scope
 FILE *rFolderList, *rFileList, *rImg, *wImg;
                                 ^~~~
prog.cpp:41:40: error: ‘wImg’ was not declared in this scope
 FILE *rFolderList, *rFileList, *rImg, *wImg;
                                        ^~~~
prog.cpp:49:5: error: ‘testWidget’ has not been declared
     testWidget::readCaliImg("Calibration.y");
     ^~~~~~~~~~
prog.cpp:51:5: error: ‘cout’ was not declared in this scope
     cout<<testWidget::caliImgName<<endl;
     ^~~~
prog.cpp:51:11: error: ‘testWidget’ has not been declared
     cout<<testWidget::caliImgName<<endl;
           ^~~~~~~~~~
prog.cpp:51:36: error: ‘endl’ was not declared in this scope
     cout<<testWidget::caliImgName<<endl;
                                    ^~~~
prog.cpp:53:56: error: ‘sprintf’ was not declared in this scope
     sprintf(sys_cmd,"dir /A:D /b t* >  folder_list.txt");
                                                        ^
prog.cpp:54:19: error: ‘system’ was not declared in this scope
     system(sys_cmd);
                   ^
prog.cpp:59:48: error: ‘fopen’ was not declared in this scope
     rFolderList = fopen("folder_list.txt", "rt");
                                                ^
prog.cpp:61:11: error: ‘EOF’ was not declared in this scope
     while(EOF!=fscanf(rFolderList,"%s",folderName))
           ^~~
prog.cpp:61:50: error: ‘fscanf’ was not declared in this scope
     while(EOF!=fscanf(rFolderList,"%s",folderName))
                                                  ^
prog.cpp:84:24: error: ‘NULL’ was not declared in this scope
             if(rImg == NULL)
                        ^~~~
prog.cpp:87:17: error: ‘showString’ was not declared in this scope
                 showString->setText(tr(fileAddr));
                 ^~~~~~~~~~
prog.cpp:87:48: error: ‘tr’ was not declared in this scope
                 showString->setText(tr(fileAddr));
                                                ^
prog.cpp:89:13: error: ‘showString’ was not declared in this scope
             showString->setText(tr(fileAddr));
             ^~~~~~~~~~
prog.cpp:89:44: error: ‘tr’ was not declared in this scope
             showString->setText(tr(fileAddr));
                                            ^
prog.cpp:92:57: error: ‘fread’ was not declared in this scope
             fread(header,sizeof(unsigned char),1078,rImg);
                                                         ^
prog.cpp:93:58: error: ‘fwrite’ was not declared in this scope
             fwrite(header,sizeof(unsigned char),1078,wImg);
                                                          ^
prog.cpp:95:27: error: ‘SEEK_SET’ was not declared in this scope
             fseek(rImg,18,SEEK_SET);
                           ^~~~~~~~
prog.cpp:95:35: error: ‘fseek’ was not declared in this scope
             fseek(rImg,18,SEEK_SET);
                                   ^
prog.cpp:109:19: error: ‘img_ori’ was not declared in this scope
             fread(img_ori,sizeof(unsigned char),width*height, rImg);
                   ^~~~~~~
prog.cpp:111:13: error: ‘testWidget’ has not been declared
             testWidget::imgProc();
             ^~~~~~~~~~
prog.cpp:117:44: error: ‘img_dst’ was not declared in this scope
                 fprintf(img_txt, "%03d\t", img_dst[i]);
                                            ^~~~~~~
prog.cpp:117:54: error: ‘fprintf’ was not declared in this scope
                 fprintf(img_txt, "%03d\t", img_dst[i]);
                                                      ^
prog.cpp:120:20: error: ‘img_dst’ was not declared in this scope
             fwrite(img_dst,sizeof(unsigned char),width*height, wImg);
                    ^~~~~~~
prog.cpp:122:24: error: ‘fclose’ was not declared in this scope
             fclose(rImg);
                        ^
prog.cpp:129:23: error: ‘fclose’ was not declared in this scope
     fclose(rFolderList);
                       ^
prog.cpp: At global scope:
prog.cpp:138:6: error: ‘testWidget’ has not been declared
 void testWidget::readCaliImg(string caliImgName)//char *caliImgName
      ^~~~~~~~~~
prog.cpp:138:30: error: variable or field ‘readCaliImg’ declared void
 void testWidget::readCaliImg(string caliImgName)//char *caliImgName
                              ^~~~~~
prog.cpp:138:30: error: ‘string’ was not declared in this scope
prog.cpp:156:6: error: ‘testWidget’ has not been declared
 void testWidget::imgProc()//
      ^~~~~~~~~~
prog.cpp: In function ‘void imgProc()’:
prog.cpp:159:5: error: ‘showString’ was not declared in this scope
     showString->setText(tr("Doing imgProc!!!!!!!!!!!!!!!!"));
     ^~~~~~~~~~
prog.cpp:159:59: error: ‘tr’ was not declared in this scope
     showString->setText(tr("Doing imgProc!!!!!!!!!!!!!!!!"));
                                                           ^
prog.cpp:161:23: error: ‘width’ was not declared in this scope
  for(int i=0; i<(int)(width*height); i++)
                       ^~~~~
prog.cpp:161:29: error: ‘height’ was not declared in this scope
  for(int i=0; i<(int)(width*height); i++)
                             ^~~~~~
prog.cpp:163:9: error: ‘img_dst’ was not declared in this scope
         img_dst[i]=(unsigned char)255;
         ^~~~~~~

Standard output is empty