Problem reading depth value in a .bmp image file.

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C

Windows

Hi everybody, I wrote a function, which I already talked of here, that should save in an array each pixel value of a bmp image file, but now I have a new problem. If I give to my function a path for a bmp image I made by myself I get as depth value '0', instead of '8', that is the depth value I saved my image with. But if I try to read this value on an image not made by me, it's alright. Can anybody help me?
This is my code function:

void get_pixels(char path[]){
FILE *fp;
int i, j=0, dim=0, count=0;
int offset;
unsigned char depth=NULL;
char bmp[5];
	
	fp = fopen(path, "rb");
	
	for(i=strlen(path)-4;i<strlen(path);i++){
		bmp[j]=path[i];
		j++;
	}
	if(strstr(bmp, ".bmp")==NULL){
		printf("\nIndicare un file .bmp come immagine!\n");
		exit(1);
	}
	
	fseek(fp, 28, SEEK_SET);
	fread(&depth, sizeof(depth), 1, fp);
	printf("\n%d", depth);
	
	if(depth!=8){
		printf("\nSelezionare una immagine a 8 bit!\n");
		exit(2);
	}
	
	fseek(fp, 10, SEEK_SET);
	fread(&offset, sizeof(offset), 1, fp);

	dim=(4-(ima_lar % 4))+ima_lar;
	j=0;
	fseek(fp, offset, SEEK_SET);
	for(i=0;i<ima_alt*dim;i++){
		if(count!=ima_lar){
			fread(&pixels[j], sizeof(char), 1, fp);
			printf("\n%d: %d", j+1, pixels[j]);
			j++;
			count++;
		}else{
			fseek(fp, 1, SEEK_CUR);
			count=0;
		}
	}
	fclose(fp);
}

path is passed to the function in a for cicle, through a string array in the form of 'filenames[i]'.