if (!(modelfile=fopen(mfile, "rb")))
{
MessageBox(NULL,"Unable to load file!","ERROR",MB_OK|MB_ICONEXCLAMATION);
}
else
{
fseek(modelfile, 0, SEEK_END);
size=ftell(modelfile);
fseek(modelfile, 0, SEEK_SET);
}
while (ftell(modelfile)<size)
{
fread (&chunkID, 2, 1, modelfile); //Read what chunk is going to be read next
fread (&chunkLength, 4, 1, modelfile); //Read the lenght of the chunk
switch (chunkID)
{
case 0x4d4d: //main
break;
case 0x3d3d: //3dmodel info
break;
case 0x4000: //object name
name=NULL;
while (name = fgetc(modelfile) != 0);
break;
case 0x4100: //OBJ_TRIMESH
break;
case 0x4110:
fread (&vertlist.count, 2, 1, modelfile);
for (vertloop=0; vertloop<vertlist.count; vertloop++)
{
fread (&vertlist.vertexinfo.vert[vertloop].x, 4, 1, modelfile);
fread (&vertlist.vertexinfo.vert[vertloop].y, 4, 1, modelfile);
fread (&vertlist.vertexinfo.vert[vertloop].z, 4, 1, modelfile);
}
break;
case 0x4120:
fread (&vertlist.facecount, 2, 1, modelfile);
for (polyloop=0; polyloop<vertlist.facecount; polyloop++)
{
fread (&vertlist.vertexinfo.vert[polyloop].a, 2, 1, modelfile);
fread (&vertlist.vertexinfo.vert[polyloop].b, 2, 1, modelfile);
fread (&vertlist.vertexinfo.vert[polyloop].c, 2, 1, modelfile);
fread (&faceinfo, 2, 1, modelfile);
}
default:
fseek(modelfile, chunkLength-6, SEEK_CUR);
}
}
fclose (modelfile);
can't read file all the way
Author
Okay I am trying to read this 3ds file all the way but I am able to only do one object and then reaches the end of the file. I can't find out how or why this is doing it maybe I am reading it wrong but I am able to get the data out of the first object in the beggening of it but after I read it it skips the rest and I was hoping someone could show me where the error might be becuase the code looks fine.
I''d start by changing
to
This part:
1) name will always end up being 0.
2) Using ; for the body of a loop is confusing, if you want an empty loop use {}.
2) If name is a pointer, I don''t think you know anything about how to use pointers.
I don''t think any of that will fix the original problem, though. For that, use a debugger. Step through the code, and check the values being read from the file to make sure they''re what you expected.
Some more tips:
- Check the return value of fread to make sure you read the correct amount of data.
- The data you''re reading is endian depenant; that is, depending in the computer you''re using, the bytes may end up being backwards, making the values you read wrong, and bad things will happen as a result.
if (!(modelfile=fopen(mfile, "rb"))) { MessageBox(NULL,"Unable to load file!","ERROR",MB_OK|MB_ICONEXCLAMATION); } else { fseek(modelfile, 0, SEEK_END); size=ftell(modelfile); fseek(modelfile, 0, SEEK_SET); } while (ftell(modelfile)<size)to
if (!(modelfile=fopen(mfile, "rb"))) { MessageBox(NULL,"Unable to load file!","ERROR",MB_OK|MB_ICONEXCLAMATION); return; } while (!feof(modelfile))This part:
case 0x4000: //object name name=NULL; while (name = fgetc(modelfile) != 0); break; 1) name will always end up being 0.
2) Using ; for the body of a loop is confusing, if you want an empty loop use {}.
2) If name is a pointer, I don''t think you know anything about how to use pointers.
I don''t think any of that will fix the original problem, though. For that, use a debugger. Step through the code, and check the values being read from the file to make sure they''re what you expected.
Some more tips:
- Check the return value of fread to make sure you read the correct amount of data.
- The data you''re reading is endian depenant; that is, depending in the computer you''re using, the bytes may end up being backwards, making the values you read wrong, and bad things will happen as a result.
This topic is closed to new replies.
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