C++读bmp位图以及调用DLL方法

最新推荐文章于 2021-04-03 21:02:36 发布

原创

最新推荐文章于 2021-04-03 21:02:36 发布 · 818 阅读

1 ·

CC 4.0 BY-SA版权

文章标签：

#c++ #位图 #dll #bmp #数据结构

bmp位图的数据结构如下所示：

unsigned char* pBmpBuf; 
int bmpWidth; 
int bmpHeight; 
RGBQUAD* pColorTable; 
int biBitCount;

unsigned char* readBmp(char* bmpName)

{
	FILE* fp = fopen(bmpName, "rb"); //以二进制读的方式打开指定的图像文件
	if (fp == 0) return 0;

	fseek(fp, sizeof(BITMAPFILEHEADER), 0);
	BITMAPINFOHEADER infoHead;
	fread(&infoHead, sizeof(BITMAPINFOHEADER), 1, fp);

	bmpWidth = infoHead.biWidth;
	bmpHeight = infoHead.biHeight;
	biBitCount = infoHead.biBitCount;

	//strick
	int lineByte = (bmpWidth * biBitCount / 8 + 3) / 4 * 4;


	if (biBitCount == 8)
	{
		pColorTable = new RGBQUAD[256];
		fread(pColorTable, sizeof(RGBQUAD), 256, fp);

	}
	pBmpBuf = new unsigned char[lineByte * bmpHeight];

	fread(pBmpBuf, 1, lineByte * bmpHeight, fp);
	fclose(fp);