libJPEG WinAPI Error - image

Question

Procedure read JPEG file
void read_jpeg_file(char *szNamaFile)
{
size_t i;
unsigned char* raw_image;
JSAMPROW row_pointer[1];
unsigned long location = 0;
struct jpeg_error_mgr jerr;
struct jpeg_decompress_struct cinfo ;
errno_t err;
FILE *infile;
err = fopen_s(&infile, szNamaFile, "rb" );
if (infile == NULL )
{
printf("Error opening jpeg file %s\n!", szNamaFile );
exit(EXIT_FAILURE);
}
cinfo.err = jpeg_std_error(&jerr);
/* create decompressor */
jpeg_create_decompress(&cinfo);
/* this makes the library read from infile */
jpeg_stdio_src(&cinfo, infile );
/* read jpeg header */
jpeg_read_header(&cinfo, TRUE);
/* decompress */
jpeg_start_decompress(&cinfo);
/*allocate memory */
raw_image = (unsigned char*)malloc( cinfo.output_width*cinfo.output_height*cinfo.num_components );
/* now actually read the jpeg into the raw buffer */
row_pointer[0] = (unsigned char *)malloc( cinfo.output_width*cinfo.num_components );
/* read scanlines */
while (cinfo.output_scanline < cinfo.output_height) {
jpeg_read_scanlines( &cinfo, row_pointer, 1 );
for(i = 0; i < cinfo.image_width*cinfo.num_components; i++)
raw_image[location++] = row_pointer[0][i];
}
/* clean up */
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
fclose( infile );
free( row_pointer[0] );
}
Procedure Open File Dialog
void OpenDialog(HWND hWnd)
{
OPENFILENAME ofn = {sizeof(ofn)};
ofn.hwndOwner = hWnd;
ofn.lpstrFilter = TEXT("File BMP (*.BMP)\0*.BMP\0File JPG (*.JPG)\0*.JPG\0");
ofn.nFilterIndex = 1;
ofn.lpstrFile = szNamaFile;
ofn.lpstrFile[0] = '\0';
ofn.lpstrTitle = TEXT("Test ...");
ofn.nMaxFile = sizeof(szNamaFile);
ofn.Flags = OFN_FILEMUSTEXIST;
if(GetOpenFileName(&ofn))
{
read_jpeg_file(ofn.lpstrFile);
}
}
WM_COMMAND
case WM_COMMAND:
if(HIWORD(wParam) != BN_CLICKED)
break;
switch(LOWORD(wParam))
{
case IDB_LOAD:
OpenDialog(hWnd);
break;
}
break;
Image doesn't show,, how to fix it? maybe I should send a message to WM_PAINT?
Sorry if I ask many questions ,, because I am still a beginner
Thank you and sorry for my bad english

Answer 1

To fix the first warning use fopen_s like this:
FILE *infile;
errno_t err = fopen_s(infile, szNamaFile, "rb");
if(0 == err)
{
// Proceed with reading if file is opened properly
...
}
To fix the second warning, replace int with size_t:
size_t i;
for( i = 0; i < cinfo.image_width * cinfo.num_components; i++)