位图源码

Ⅰ 怎么样在c语言中显示bmp图片,我要完整正确的程序,急!

lz 你好

c语言要显示bmp位图需要使用win32的api , 具体如下:

BOOLBitBlt(
HDChdcDest,//位图显示目标设备环境中
intnXDest,//位图显示在客户区的x坐标
intnYDest,//位图显示在客户区的y坐标
intnWidth,//位图显示的宽度
intnHeight,//位图显示的长度
HDChdcSrc,//源设备环境(包含需要显示的bmp位图)
intnXSrc,//在当前位图中显示的开始x位置
intnYSrc,//在当前位图中显示的开始y位置
DWORDdwRop//映射模式
);

以下是源代码:

//显示bmp位图
#include<windows.h>
#include"resource.h"

LRESULTCALLBACKWndProc(HWND,UINT,WPARAM,LPARAM);
voidDrawBrick();

intWINAPIWinMain(HINSTANCEhInstance,
				HINSTANCEhPrevInstance,
PSTRszCmdLine,
				intiCmdShow)
{
	static	TCHAR	szAppName[]=TEXT("Bmp");
	HWND			hwnd;
	MSG				msg;
	WNDCLASS		wndclass;
	
	wndclass.style			=CS_HREDRAW|CS_VREDRAW;
	wndclass.lpfnWndProc	=WndProc;
	wndclass.cbClsExtra		=0;
	wndclass.cbWndExtra		=0;
	wndclass.hInstance		=hInstance;
	wndclass.hIcon			=LoadIcon(NULL,IDI_APPLICATION);
	wndclass.hCursor		=LoadCursor(NULL,IDC_ARROW);
	wndclass.hbrBackground	=(HBRUSH)GetStockObject(WHITE_BRUSH);
	wndclass.lpszMenuName	=NULL;
	wndclass.lpszClassName	=szAppName;
	
	if(!RegisterClass(&wndclass))
	{
		MessageBox(NULL,TEXT("ThisprogramrequiresWindowsNT!"),
			szAppName,MB_ICONERROR);
		return0;
	}
	
	hwnd=CreateWindow(szAppName,
						TEXT("BmpDemo"),
						WS_OVERLAPPEDWINDOW,
						CW_USEDEFAULT,
						CW_USEDEFAULT,
						754,
						566,
						NULL,
						NULL,
						hInstance,
						NULL);
	
	ShowWindow(hwnd,iCmdShow);
	UpdateWindow(hwnd);
	
	while(GetMessage(&msg,NULL,0,0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	
	returnmsg.wParam;
}

LRESULTCALLBACKWndProc(HWNDhwnd,UINTmessage,WPARAMwParam,LPARAMlParam)
{
	static	HBITMAP	hBitmap;			//位图句柄标示位图
	staticint		cxBitmap,cyBitmap;	//位图的长宽
	BITMAP			bitmap;
	HDC				hdc,hdcMem;
	HINSTANCE		hInstance;
	PAINTSTRUCT		ps;
	
	switch(message)
	{
	caseWM_CREATE:
		hInstance=((LPCREATESTRUCT)lParam)->hInstance;				//获取窗口的实例句柄
		
		hBitmap=LoadBitmap(hInstance,MAKEINTRESOURCE(IDB_BITMAP1));	//将位图加载到内存中
		
		GetObject(hBitmap,sizeof(BITMAP),&bitmap);
		
		cxBitmap=bitmap.bmWidth;//获取位图的长
		cyBitmap=bitmap.bmHeight;//获取位图的宽

		return0;
		
	caseWM_PAINT:
		hdc=BeginPaint(hwnd,&ps);
		
		hdcMem=CreateCompatibleDC(hdc);//创建一个兼容于hdc设备环境描述表的hdcMem主要是用于在内存中截图
		SelectObject(hdcMem,hBitmap);//将位图选到hdcMem中

		BitBlt(hdc,-1,-1,cxBitmap,cyBitmap,hdcMem,0,0,SRCCOPY);//绘制bmp位图

		DeleteDC(hdcMem);
		EndPaint(hwnd,&ps);

		return0;

	caseWM_DESTROY:
		DeleteObject(hBitmap);
		PostQuitMessage(0);

		return0;
	}
	
	returnDefWindowProc(hwnd,message,wParam,lParam);
}

程序运行效果:

Ⅱ 用c语言读取24位位图bmp文件

可以使用C语言标准函数库中的fopen、fseek、fclose等系列函数来打开bmp位图文件，以及进行相应的处理，下面是一个demo，仅供参考。以下代码在vc6.0中编译通过。

#include<stdio.h>
#include<stdlib.h>
#//ThebmpFileHeaderlengthis14
#defineBM19778//TheASCIIcodeforBM
/*Testthefileisbmpfileornot*/
voidbmpFileTest(FILE*fpbmp);
/**/
voidbmpHeaderPartLength(FILE*fpbmp);
/**/
voidBmpWidthHeight(FILE*fpbmp);
//getr,g,bdata
voidbmpDataPart(FILE*fpbmp);
//
voidbmpoutput(FILE*fpout);
unsignedintOffSet=0;//
longwidth;//TheWidthoftheDataPart
longheight;//TheHeightoftheDataPart
unsignedcharr[2000][2000],output_r[2000][2000];
unsignedcharg[2000][2000],output_g[2000][2000];
unsignedcharb[2000][2000],output_b[2000][2000];
intmain(intargc,char*argv[])
{
/*Openbmpfile*/
unsignedchar*fp_temp;
FILE*fpbmp;
FILE*fpout;
fpbmp=fopen("1.bmp","rb");
if(fpbmp==NULL)
{
printf("Openbmpfailed!!!
");
return1;
}
fpout=fopen("out.bmp","wb+");
if(fpout==NULL)
{
printf("Openout.bmpfailed!!!
");
return1;
}

bmpFileTest(fpbmp);//Testthefileisbmpfileornot
bmpHeaderPartLength(fpbmp);//GetthelengthofHeaderPart
BmpWidthHeight(fpbmp);//


//
fseek(fpbmp,0L,SEEK_SET);
fseek(fpout,0L,SEEK_SET);

fp_temp=(unsignedchar*)malloc(OffSet);
fread(fp_temp,1,OffSet,fpbmp);
fwrite(fp_temp,1,OffSet,fpout);

bmpDataPart(fpbmp);//Reservethedatatofile

/*


如果您想对图片进行处理，请您再这里插入处理函数!!!!!!!!!!!!!!!!!!

*/
bmpoutput(fpout);
fclose(fpbmp);
fclose(fpout);
return0;
}
voidbmpoutput(FILE*fpout)
{
inti,j=0;
intstride;
unsignedchar*pixout=NULL;

stride=(24*width+31)/8;
stride=stride/4*4;
pixout=(unsignedchar*)malloc(stride);

fseek(fpout,OffSet,SEEK_SET);
for(j=0;j<height;j++)
{
for(i=0;i<width;i++)
{
pixout[i*3+2]=output_r[height-1-j][i];
pixout[i*3+1]=output_g[height-1-j][i];
pixout[i*3]=output_b[height-1-j][i];
}
fwrite(pixout,1,stride,fpout);
}
}
voidbmpDataPart(FILE*fpbmp)
{
inti,j=0;
intstride;
unsignedchar*pix=NULL;
FILE*fpr;
FILE*fpg;
FILE*fpb;

if((fpr=fopen("bmpr.txt","w+"))==NULL)
{
printf("Failedtoconstructfilebmpr.txt.!!!");
exit(1);
}
if((fpg=fopen("bmpg.txt","w+"))==NULL)
{
printf("Failedtoconstructfilebmpg.txt.!!!");
exit(1);
}
if((fpb=fopen("bmpb.txt","w+"))==NULL)
{
printf("Failedtoconstructfilebmpb.txt.!!!");
exit(1);
}

fseek(fpbmp,OffSet,SEEK_SET);
stride=(24*width+31)/8;
stride=stride/4*4;
pix=(unsignedchar*)malloc(stride);

for(j=0;j<height;j++)
{
fread(pix,1,stride,fpbmp);
for(i=0;i<width;i++)
{
r[height-1-j][i]=pix[i*3+2];
g[height-1-j][i]=pix[i*3+1];
b[height-1-j][i]=pix[i*3];
output_r[height-1-j][i]=pix[i*3+2];
output_g[height-1-j][i]=pix[i*3+1];
output_b[height-1-j][i]=pix[i*3];
}
}
for(i=0;i<height;i++)
{
for(j=0;j<width-1;j++)
{
fprintf(fpb,"%4d",b[i][j]);
fprintf(fpg,"%4d",g[i][j]);
fprintf(fpr,"%4d",r[i][j]);
}
fprintf(fpb,"%4d
",b[i][j]);
fprintf(fpg,"%4d
",g[i][j]);
fprintf(fpr,"%4d
",r[i][j]);
}

fclose(fpr);
fclose(fpg);
fclose(fpb);

}
voidbmpFileTest(FILE*fpbmp)
{
unsignedshortbfType=0;

fseek(fpbmp,0L,SEEK_SET);//seek_set起始位置
fread(&bfType,sizeof(char),2,fpbmp);
if(BM!=bfType)
{
printf("Thisfileisnotbmpfile.!!!
");
exit(1);
}
}
/**/
voidbmpHeaderPartLength(FILE*fpbmp)
{
fseek(fpbmp,10L,SEEK_SET);
fread(&OffSet,sizeof(char),4,fpbmp);
printf("TheHeaderPartisoflength%d.
",OffSet);
}
/**/
voidBmpWidthHeight(FILE*fpbmp)
{
fseek(fpbmp,18L,SEEK_SET);
fread(&width,sizeof(char),4,fpbmp);
fseek(fpbmp,22L,SEEK_SET);
fread(&height,sizeof(char),4,fpbmp);
printf("TheWidthofthebmpfileis%ld.
",width);
printf("TheHeightofthebmpfileis%ld.
",height);
}