fscanf无法读取值

Question

I am trying to read a text file using fscanf.I am working in eclipse in OpenCV on ubuntu. Here are some sample values in the text file 0 5 7 0.547619047619048 1 0.0274509803921569 1 0 6 8 0.541666666666667 1 0.0313725490196078 1 0 8 10 0.533333333333333 1 0.0392156862745098 1

But all fscanf reads is zeros in the array.Here is the part of the code that reads the values

long double testd[1000][6]
FILE* fid1=fopen("file","r");

while((fscanf(fid1,"%Lf",&b))==1)
{

    printf("%Lf\n",b);
    testsamplecount=testsamplecount+1;
}

for (i=0;i<testsamplecount/6;i++)
{
    fscanf(fid1,"%Lf %Lf %Lf %Lf %Lf %Lf",
                &testd[i][0],&testd[i][1],
                &testd[i][2],&testd[i][3],
                &testd[i][4],&testd[i][5]);      
}

Answer 1

testd[i][0] , etc, is an rvalue. What you need is &testd[i][0] .

Answer 2

The first loop consumes the file. Try rewind(fid1); between the loops.

Edit: alternatively, as an option maybe a little more laborious but twice as performant, do a single loop, reading until there is no more data.

Answer 3

I think you don't move the file pointer to the start point of the file. Use the library fseek(fp, 0, 0) or Try close the file and then open again.