自定义一个位图处理类，生成的位图文件无法用画图工具打开，请各位高手帮忙看一下！

[tobephonix]

自定义一个位图处理类，用来生成、编辑、保存DIB位图对象，目前利用这个类生成的BMP文件无法用WINDOWS自带画图工具打开，请各位高手帮我看一下程序哪些地方有问题。这是小弟写的第一个c++程序，请各位不吝赐教！

========================================================================
头文件：

class CBitMapUtil
{
private:
HBITMAP m_hBitMap; //the handle of a bitmap object
byte* m_pBmpBits; //pointer to bitmap bits data
BITMAPFILEHEADER hBmpFhd;
LPBITMAPINFO lpBmpInfo;
private:
bool CreateBitMap(LPBITMAPINFO lpBmpInfo, void* lpSrcBits); //create a bitmap as the defined width and height from the lpSrcBits
void CreateFileHeader();

public:
CBitMapUtil();
CBitMapUtil(int nWidth,int nHeight,UINT nBitCount); //contructor for a bitmap as defined widht and height
void SetPixel(int xPixel,int yPixel,COLORREF color); //paint point with specific color
bool SaveBitMap(LPCTSTR fileName); //save the bitmap object to disk
~CBitMapUtil();
};
========================================================================
cpp文件：
#include "stdafx.h"
#include "CBitMapUtil.h"
#include "Windef.h"
CBitMapUtil::CBitMapUtil()
{

}
/*

*/
CBitMapUtil::CBitMapUtil(int nWidth,int nHeight,UINT nbitCount)
{
ASSERT(nbitCount == 24); //only deal with 24-bit bitmap object;
lpBmpInfo = (LPBITMAPINFO) new BYTE[sizeof(BITMAPINFOHEADER)];
//init BITMAPINFOHEADER
lpBmpInfo->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
lpBmpInfo->bmiHeader.biWidth = nWidth;
lpBmpInfo->bmiHeader.biHeight = nHeight;
lpBmpInfo->bmiHeader.biBitCount = nbitCount;
lpBmpInfo->bmiHeader.biPlanes = 1;
lpBmpInfo->bmiHeader.biCompression = 0;
lpBmpInfo->bmiHeader.biSizeImage = nWidth*nHeight*3 ; //may be need to be recalculated
lpBmpInfo->bmiHeader.biXPelsPerMeter = 0x0;
lpBmpInfo->bmiHeader.biYPelsPerMeter = 0x0;
lpBmpInfo->bmiHeader.biClrUsed = 0;
lpBmpInfo->bmiHeader.biClrImportant = 0;
//init m_pBmpBits
m_pBmpBits = (byte*) new BYTE[nWidth*nHeight*3];
for(int i = 0;i < sizeof(m_pBmpBits); i++)
{
m_pBmpBits[i]=(byte)0xFF; //init as white background;
}
//create bitmap object
CreateBitMap(lpBmpInfo,m_pBmpBits);
}


bool CBitMapUtil::CreateBitMap(LPBITMAPINFO lpBmpInfo,LPVOID lpSrcBits)
{
HDC hMemDC;
hMemDC = CreateCompatibleDC (NULL);
m_hBitMap = CreateDIBSection(hMemDC,lpBmpInfo,DIB_RGB_COLORS,&lpSrcBits,NULL,0);
delete hMemDC;
return true;
}


void CBitMapUtil::SetPixel(int xPixel,int yPixel,COLORREF color)
{
CDC dc;
dc.SelectObject(m_hBitMap);
dc.SetPixel(xPixel,yPixel,color);
delete dc;
}

void CBitMapUtil::CreateFileHeader()
{
hBmpFhd.bfType = (('B'<<8)|'M');
hBmpFhd.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + sizeof(m_pBmpBits);
hBmpFhd.bfReserved1 = 0;
hBmpFhd.bfReserved2 = 0;
hBmpFhd.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
}

bool CBitMapUtil::SaveBitMap(LPCTSTR lpszFileName)
{
CFile file;
if (!file.Open(lpszFileName, CFile::modeWrite|CFile::modeCreate))
return FALSE;

file.Write(&hBmpFhd, sizeof(hBmpFhd));
// Write the DIB header
file.Write(lpBmpInfo, sizeof(BITMAPINFOHEADER));

// Write DIB bits
file.Write(m_pBmpBits, lpBmpInfo->bmiHeader.biSizeImage);

return TRUE;
}

CBitMapUtil::~CBitMapUtil()
{
delete m_hBitMap;
delete m_pBmpBits;
delete lpBmpInfo;
}

[tobephonix]

没人理，郁闷！

大家给点意见吧，UP有分！

[yingyinghz]

BMP文件有固定的文件头和格式，

（具体也记得不是很清楚是怎样的了）保证这些都没错，，才能让文件打开

[yingyinghz]

说实话。。。这么长的程序，，又没有注释。。。愿意看的人好像不多

[mct1025]

我也遇到过这个问题，有些图片能打开，有些图片打不开，但不知怎么解决

帮你up

[chenghl]

BITMAPFILEHEADER bfh;
BITMAPINFOHEADER bih;
memset(&bfh, 0, sizeof(BITMAPFILEHEADER));
memset(&bih, 0, sizeof(BITMAPINFOHEADER));
bfh.bfType =0x4D42;//别少了！！！！
bfh.bfSize =sizeof(BITMAPFILEHEADER) +sizeof(BITMAPINFOHEADER) +size;
bfh.bfOffBits =sizeof(BITMAPFILEHEADER) +sizeof(BITMAPINFOHEADER);//54

bih.biSize = (LONG)sizeof(BITMAPINFOHEADER);
bih.biWidth = 352;//Width;
bih.biHeight= 288;//Height;
bih.biPlanes = 1;
bih.biBitCount = 24;
bih.biCompression = BI_RGB;
bih.biSizeImage = size;
bih.biXPelsPerMeter = 0;
bih.biYPelsPerMeter = 0；
bih.biClrUsed = 0;
bih.biClrImportant =0;

[youda]

to up
既然bih.biBitCount=24,就是BID，而不是DDB，就要考虑颜色表！
那么bfh.bfsize,bfh.bfOffBits的大小就要加上颜色表大小，sizeof(RGBQURAD)*m_nColorEntries.

DDB与DIB的结构是不同的，注意CBITMAP类BMP的区别！

[tobephonix]

to youda() :本人的理解是24位颜色模式是直接用像素数据表示颜色信息(rrggbb)，没有用到颜色表，所以就没有考虑颜色的尺寸，不知道这样是否正确。

[njsg_zeng]

lpBmpInfo->bmiHeader.biSizeImage = nWidth*nHeight*3 ; //may be need to be recalculated

有没有考虑到图象宽度*bitCount/8不能够被8整除需要补位的情况阿，建议看些关于bmp格式的文章

[dawndu]

学习，帮你up

[minworld]

不知道你的位图文件每一行字节数的大小是不是能被四整除啊

[孤必有邻]

（改了改，可以用了：共3部分）

// 1、头文件：

class CBitMapUtil
{
private:
HBITMAP m_hBitMap; //the handle of a bitmap object
byte* m_pBmpBits; //pointer to bitmap bits data
BITMAPFILEHEADER hBmpFhd;
LPBITMAPINFO lpBmpInfo;
//
HDC hMemDC;
int m_nSize;
private:
bool CreateBitMap(LPBITMAPINFO lpBmpInfo, void* lpSrcBits); //create a bitmap as the defined width and height from the lpSrcBits
void CreateFileHeader();

public:
CBitMapUtil();
CBitMapUtil(int nWidth,int nHeight,UINT nBitCount); //contructor for a bitmap as defined widht and height
void SetPixel(int xPixel,int yPixel,COLORREF color); //paint point with specific color
bool SaveBitMap(LPCTSTR fileName); //save the bitmap object to disk
~CBitMapUtil();
};

// 2、cpp文件：

#include "stdafx.h"
#include "Bitmap.h"//改名
#include "Windef.h"
CBitMapUtil::CBitMapUtil()
{}
CBitMapUtil::CBitMapUtil(int nWidth,int nHeight,UINT nbitCount)
{
ASSERT(nbitCount == 24); //only deal with 24-bit bitmap object;
lpBmpInfo = (LPBITMAPINFO) new BYTE[sizeof(BITMAPINFOHEADER)];
//init BITMAPINFOHEADER
lpBmpInfo->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
lpBmpInfo->bmiHeader.biWidth = nWidth;
lpBmpInfo->bmiHeader.biHeight = nHeight;
lpBmpInfo->bmiHeader.biBitCount = nbitCount;
lpBmpInfo->bmiHeader.biPlanes = 1;
lpBmpInfo->bmiHeader.biCompression = 0;
lpBmpInfo->bmiHeader.biSizeImage = nWidth*nHeight*3 ; //may be need to be recalculated
lpBmpInfo->bmiHeader.biXPelsPerMeter = 0x0;
lpBmpInfo->bmiHeader.biYPelsPerMeter = 0x0;
lpBmpInfo->bmiHeader.biClrUsed = 0;
lpBmpInfo->bmiHeader.biClrImportant = 0;
//init m_pBmpBits
m_nSize=nWidth*nHeight*3;
m_pBmpBits = (byte*) new BYTE[m_nSize];
for(int i = 0;i < sizeof(m_pBmpBits); i++)
{
m_pBmpBits[i]=(byte)0xFF; //init as white background;
}
//create bitmap object
CreateBitMap(lpBmpInfo,m_pBmpBits);
}

bool CBitMapUtil::CreateBitMap(LPBITMAPINFO lpBmpInfo,LPVOID lpSrcBits)
{
//HDC hMemDC;
CreateFileHeader();
hMemDC = CreateCompatibleDC (NULL);
m_hBitMap = CreateDIBSection(hMemDC,lpBmpInfo,DIB_RGB_COLORS,&lpSrcBits,NULL,0);
//delete hMemDC;
return true;
}

void CBitMapUtil::SetPixel(int xPixel,int yPixel,COLORREF color)
{
CDC * pDC=CDC::FromHandle(hMemDC);
//pDC->SelectObject(m_hBitMap);
pDC->SetPixel(xPixel,yPixel,color);
//delete dc;
}

void CBitMapUtil::CreateFileHeader()
{
hBmpFhd.bfType = (('M'<<8)|'B');
//hBmpFhd.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + sizeof(m_pBmpBits);
hBmpFhd.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + m_nSize;
hBmpFhd.bfReserved1 = 0;
hBmpFhd.bfReserved2 = 0;
hBmpFhd.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
}

bool CBitMapUtil::SaveBitMap(LPCTSTR lpszFileName)
{
CFile file;
if (!file.Open(lpszFileName, CFile::modeWrite|CFile::modeCreate))
return FALSE;

file.Write(&hBmpFhd, sizeof(hBmpFhd));
// Write the DIB header
file.Write(lpBmpInfo, sizeof(BITMAPINFOHEADER));

// Write DIB bits
file.Write(m_pBmpBits, lpBmpInfo->bmiHeader.biSizeImage);

file.Close();
return TRUE;
}

CBitMapUtil::~CBitMapUtil()
{
//delete m_hBitMap;
delete m_pBmpBits;
delete lpBmpInfo;
}

// 3、使用方法

#include "Bitmap.h"//引用头文件
//在任何适当的地方

CBitMapUtil bmp(32,32,24);//尺寸任意，24必须
bmp.SetPixel(0,0,RGB(255,0,0));
//...随意画图
bmp.SaveBitMap("c:\\bmp.bmp");//文件名自定

//当前问题：1、色彩不对，2、位置不对。（好好调吧）

[tobephonix]

写这个类的目的是用来以图形的方式输出调试结果，后来由于这个类无法达到预期的效果就放弃了，不过谢谢大家的意见和建议^_^

to wangjinwang(王进):有机会我会调试你的源代码，非常感谢！