BMP图像加载实例（C语言）

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bmp图像常被称为位图，这实际是对位图的误解，具体可见opengl superbible中对图像的说明。

代码如下：

#include <stdio.h>#include <stdlib.h>#include <GL/glew.h>#ifdef _APPLE_#include <glut/glut.h>#else#define FREEGLUT_STATIC#include <GL/glut.h>#endifGLuint loadBMP_custom(const char * imagepath);// Data read from the header of the BMP fileunsigned char header[54]; // Each BMP file begins by a 54-bytes headerunsigned int dataPos; // Position in the file where the actual data beginsunsigned int width, height;unsigned int imageSize; // = width*height*3// Actual RGB dataunsigned char * data;int main(int argc, char **argv){FILE * file = fopen("1.bmp", "rb");if (!file){printf("Image could not be openedn"); return 0;}if ( fread(header, 1, 54, file)!=54 ){ // If not 54 bytes read :problemprintf("Not a correct BMP filen");return 0;}if ( header[0]!='B' || header[1]!='M' ){printf("Not a correct BMP filen");return 0;}// Read ints from the byte arraydataPos = *(int*)&(header[0x0A]);imageSize = *(int*)&(header[0x22]);width = *(int*)&(header[0x12]);height = *(int*)&(header[0x16]);printf("%d \t %d \t %d \t %d \n", dataPos, imageSize, width, height);printf("%d \t %d \t %d \t %d \n", &(header[0x0A]),&(header[0x22]),&(header[0x12]), &(header[0x16]));printf("%d \t %d \t %d \t %d \n", &(header[0x0A]),&(header[0x22]),(int *)&(header[0x12]), &(header[0x16]));printf("%d\t %d\t",*(int*)&(header[0x12]), *(char*)&(header[0x16]));getchar();return 0;}

使用的图像：

测试结果如下：

1 0