UnregisterTIFFImage

[zwolf]

I need a function to convert byte streams from png to jpeg.
The function will be used in a program written in vala.

I get the following error when I run for the second time:

> Memory allocation failed `'@ fatal/tiff.c/UnregisterTIFFImage/1831

I write an example for debugging:

Code: Select all

#include <stdio.h>
#include <wand/magick-wand.h>

void convertImg(unsigned char bufferA[], int sizeA, caddr_t* bufferB, size_t* sizeB, char *format ) {
  MagickWand *mw;
  MagickBooleanType status;
  int w,h;
  
  MagickWandGenesis();  
  mw = NewMagickWand();
  
  status=MagickReadImageBlob(mw, bufferA, sizeA);
  
  h = MagickGetImageHeight(mw);
  w = MagickGetImageWidth(mw);
  printf("%ix%i\n",w,h);

  MagickSetFormat(mw,format);
  
  *bufferB = MagickGetImagesBlob(mw, sizeB);  
  
  DestroyMagickWand(mw);
  MagickWandTerminus();
}

int main(void) {

  FILE *fr;
  FILE *fw;
  int size = 8732;
  unsigned char buffer[size];  
  int n;
  size_t length = 0;
  caddr_t out;
    
  fr = fopen("logo.jpg","rb");
  fread(buffer,1,size,fr);
  
  convertImg(buffer,size,&out,&length,"PNG");   
  convertImg(buffer,size,&out,&length,"PNG");   

  fw = fopen("logo.png","wb");
  fwrite(out,1,length,fw);
  fclose(fr);
  fclose(fw);    
  return 0;

}

I'm not very experienced in C language Someone give me a hint?
Thank you.

[zwolf]

I solved.

//MagickWandTerminus();

Boh!.