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Class ImgWHInfo '获取图片宽度和高度的类，支持JPG，GIF，PNG，BMP
Dim ASO
Private Sub Class_Initialize
Set ASO=Server.CreateObject("ADODB.Stream")
ASO.Mode=3
ASO.Type=1
ASO.Open
End Sub
Private Sub Class_Terminate
Err.Clear
Set ASO=Nothing
End Sub
Private Function Bin2Str(Bin)
Dim I, Str
For I=1 To LenB(Bin)
clow=MidB(Bin,I,1)
If ASCB(clow)128 Then
Str = Str Chr(ASCB(clow))
Else
I=I+1
If I = LenB(Bin) Then Str = Str Chr(ASCW(MidB(Bin,I,1)clow))
End If
Next
Bin2Str = Str
End Function
Private Function Num2Str(Num,Base,Lens)
Dim Ret
Ret = ""
While(Num=Base)
Ret = (Num Mod Base) Ret
Num = (Num - Num Mod Base)/Base
Wend
Num2Str = Right(String(Lens,"0") Num Ret,Lens)
End Function
Private Function Str2Num(Str,Base)
Dim Ret,I
Ret = 0
For I=1 To Len(Str)
Ret = Ret *base + Cint(Mid(Str,I,1))
Next
Str2Num=Ret
End Function
Private Function BinVal(Bin)
Dim Ret,I
Ret = 0
For I = LenB(Bin) To 1 Step -1
Ret = Ret *256 + AscB(MidB(Bin,I,1))
Next
BinVal=Ret
End Function
Private Function BinVal2(Bin)
Dim Ret,I
Ret = 0
For I = 1 To LenB(Bin)
Ret = Ret *256 + AscB(MidB(Bin,I,1))
Next
BinVal2=Ret
End Function
Private Function GetImageSize(filespec)
Dim bFlag
Dim Ret(3)
ASO.LoadFromFile(filespec)
bFlag=ASO.Read(3)
Select Case Hex(binVal(bFlag))
Case "4E5089":
ASO.Read(15)
ret(0)="PNG"
ret(1)=BinVal2(ASO.Read(2))
ASO.Read(2)
ret(2)=BinVal2(ASO.Read(2))
Case "464947":
ASO.read(3)
ret(0)="gif"
ret(1)=BinVal(ASO.Read(2))
ret(2)=BinVal(ASO.Read(2))
Case "535746":
ASO.read(5)
binData=ASO.Read(1)
sConv=Num2Str(ascb(binData),2 ,8)
nBits=Str2Num(left(sConv,5),2)
sConv=mid(sConv,6)
While(len(sConv)nBits*4)
binData=ASO.Read(1)
sConv=sConvNum2Str(AscB(binData),2 ,8)
Wend
ret(0)="SWF"
ret(1)=Int(Abs(Str2Num(Mid(sConv,1*nBits+1,nBits),2)-Str2Num(Mid(sConv,0*nBits+1,nBits),2))/20)
ret(2)=Int(Abs(Str2Num(Mid(sConv,3*nBits+1,nBits),2)-Str2Num(Mid(sConv,2*nBits+1,nBits),2))/20)
Case "FFD8FF":
Do
Do: p1=binVal(ASO.Read(1)): Loop While p1=255 And Not ASO.EOS
If p1191 And p1196 Then Exit Do Else ASO.read(binval2(ASO.Read(2))-2)
Do:p1=binVal(ASO.Read(1)):Loop While p1255 And Not ASO.EOS
Loop While True
ASO.Read(3)
ret(0)="JPG"
ret(2)=binval2(ASO.Read(2))
ret(1)=binval2(ASO.Read(2))
Case Else:
If left(Bin2Str(bFlag),2)="BM" Then
ASO.Read(15)
ret(0)="BMP"
ret(1)=binval(ASO.Read(4))
ret(2)=binval(ASO.Read(4))
Else
ret(0)=""
End If
End Select
ret(3)="width=""" ret(1) """ height=""" ret(2) """"
getimagesize=ret
End Function
Public Function imgW(IMGPath)
Dim FSO,IMGFile,FileExt,Arr
Set FSO = Server.CreateObject("Scripting.FileSystemObject")
If (FSO.FileExists(IMGPath)) Then
Set IMGFile = FSO.GetFile(IMGPath)
FileExt=FSO.GetExtensionName(IMGPath)
Select Case FileExt
Case "gif","bmp","jpg","png":
Arr=GetImageSize(IMGFile.Path)
imgW = Arr(1)
End Select
Set IMGFile=Nothing
Else
imgW = 0
End If
Set FSO=Nothing
End Function
Public Function imgH(IMGPath)
Dim FSO,IMGFile,FileExt,Arr
Set FSO = server.CreateObject("Scripting.FileSystemObject")
If (FSO.FileExists(IMGPath)) Then
Set IMGFile = FSO.GetFile(IMGPath)
FileExt=FSO.GetExtensionName(IMGPath)
Select Case FileExt
Case "gif","bmp","jpg","png":
Arr=getImageSize(IMGFile.Path)
imgH = Arr(2)
End Select
Set IMGFile=Nothing
Else
imgH = 0
End If
Set FSO=Nothing
End Function
End Class
IMGPath="Test.jpg"
Set PP = New ImgWHInfo
W = PP.imgW(Server.Mappath(IMGPath))
H = PP.imgH(Server.Mappath(IMGPath))
Set pp = Nothing
Response.Write("img src='"IMGPath"' border=0br宽:"W";高:"H)
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mgdecmp库是WINCE 系统提供一个解码BMP,GIF,PNG,JPG的文件的库,这个库的缺陷是不能解出MASK 图片.具体用法如下:
1.把imgdecmp.h加入工程,imgdecmp.h文件内容如下:
/*---------------------------------------------------------------------------*/
*
* (c) Copyright Microsoft Corp. 1997-98 All Rights Reserved
*
* module: imgdecmp.h
* date:
* author: jaym
*
* purpose:
*
/*---------------------------------------------------------------------------*/
#ifndef __IMGDECMP_H__
#define __IMGDECMP_H__
#ifdef __cplusplus
extern "C" {
#endif // __cplusplus
#include "imgrendr.h"
typedef void (CALLBACK *PROGRESSFUNC)(IImageRender *pRender, BOOL bComplete, LPARAM lParam);
typedef DWORD (CALLBACK *GETDATAFUNC)(LPSTR szBuffer, DWORD dwBufferMax, LPARAM lParam);
typedef struct tagDecompressImageInfo {
DWORD dwSize; // Size of this structure
LPBYTE pbBuffer; // Pointer to the buffer to use for data
DWORD dwBufferMax; // Size of the buffer
DWORD dwBufferCurrent; // The amount of data which is current in the buffer
HBITMAP * phBM; // Pointer to the bitmap returned (can be NULL)
IImageRender ** ppImageRender; // Pointer to an IImageRender object (can be NULL)
int iBitDepth; // Bit depth of the output image
LPARAM lParam; // User parameter for callback functions
HDC hdc; // HDC to use for retrieving palettes
int iScale; // Scale factor (1 - 100)
int iMaxWidth; // Maximum width of the output image
int iMaxHeight; // Maxumum height of the output image
GETDATAFUNC pfnGetData; // Callback function to get more data
PROGRESSFUNC pfnImageProgress; // Callback function to notify caller of progress decoding the image
COLORREF crTransparentOverride; // If this color is not (UINT)-1, it will override the
// transparent color in the image with this color. (GIF ONLY)
} DecompressImageInfo;
#define IMGDECOMP_E_NOIMAGE 0x800b0100
COLORREF *
GetHalftonePalette();
COLORREF *
Get332Palette();
HRESULT
DecompressImageIndirect(DecompressImageInfo *pParams);
#ifdef __cplusplus
};
#endif // __cplusplus
#endif // !__IMGDECMP_H__
2.按照下面的方法使用.
HDC hdc = CreateCompatibleDC(NULL);
DecompressImageInfo dii;
BYTE szBuffer[1024] = {0};
HANDLE hFile = INVALID_HANDLE_VALUE;
// Fill in the 'DecompressImageInfo' structure
dii.dwSize = sizeof( DecompressImageInfo ); // Size of this structure
dii.pbBuffer = szBuffer; // Pointer to the buffer to use for data
dii.dwBufferMax = 1024; // Size of the buffer
dii.dwBufferCurrent = 0; // The amount of data which is current in the buffer
dii.phBM = hBitmap; // Pointer to the bitmap returned (can be NULL)
dii.ppImageRender = NULL; // Pointer to an IImageRender object (can be NULL)
dii.iBitDepth = GetDeviceCaps(hdc,BITSPIXEL); // Bit depth of the output image
dii.lParam = ( LPARAM ) iCeBMPFile;//hFile; // User parameter for callback functions
dii.hdc = hdc; // HDC to use for retrieving palettes
dii.iScale = 100; // Scale factor (1 - 100)
dii.iMaxWidth = 10000; // Maximum width of the output image
dii.iMaxHeight = 10000; // Maxumum height of the output image
dii.pfnGetData = GetImageData; // Callback function to get image data
dii.pfnImageProgress = ImageProgress; // Callback function to notify caller of progress decoding the image
dii.crTransparentOverride = ( UINT ) -1; // If this color is not (UINT)-1, it will override the
// transparent color in the image with this color. (GIF ONLY)
// Process and decompress the image data
typedef HRESULT (CALLBACK* ULPRET)( DecompressImageInfo* pParams );
HINSTANCE hLib;
ULPRET lpfnDLLProc;
hLib = LoadLibrary ( L"Imgdecmp.dll" );
if ( hLib )
{
lpfnDLLProc = (ULPRET) GetProcAddress ( hLib, L"DecompressImageIndirect" );
hr = (*lpfnDLLProc) ( dii );
FreeLibrary ( hLib );
}
// Clean up
DeleteDC( hdc );
#include stdio.h
#include stdlib.h
#include windows.h
int file_size(char* filename)//获取文件名为filename的文件大小。
{
FILE *fp = fopen(filename, "rb");//打开文件。
int size;
if(fp == NULL) // 打开文件失败
return -1;
fseek(fp, 0, SEEK_END);//定位文件指针到文件尾。
size=ftell(fp);//获取文件指针偏移量，即文件大小。
fclose(fp);//关闭文件。
return size;
}
int main ()
{
int size=0;
size=file_size("qw");
printf("%d\n",size);
FILE * pFile,*qw;
char *buffer=(char*)malloc(sizeof(char)*size);
qw =fopen("qw","r");
pFile = fopen ( "qwe" , "wb" );
printf("%d==\n",pFile);
printf("%d\n",size);
fread(buffer,1,size,qw);
fwrite (buffer , sizeof(byte), size , pFile );
fclose (pFile);
rename("qwe","Groot.jpg");
return 0;
}
扩展资料：
c语言读取TXT文件：
#include stdio.h
#include stdlib.h
#include string.h
#define MAX_LINE 1024
int main()
{
char buf[MAX_LINE]; /*缓冲区*/
FILE *fp; /*文件指针*/
int len; /*行字符个数*/
if((fp = fopen("test.txt","r")) == NULL)
{
perror("fail to read");
exit (1) ;
}
while(fgets(buf,MAX_LINE,fp) != NULL)
{
len = strlen(buf);
buf[len-1] = '\0'; /*去掉换行符*/
printf("%s %d \n",buf,len - 1);
}
return 0;
}
一般来讲是生成
ppm
or
pnm
处理图片数据的,
但是如果你非要读取
JPG
格式的数据,
我想下面的
Library
可以帮助到你.
#include
using namespace std;
#define Twoto1(i,j,w) i*w+j
void createimage(unsigned char *img, int w, int h)
{img = new unsigned char[w*h];}
void delateimage(unsigned char*img)
{delete []img;}
void readimage(unsigned char*img, int w, int h, char *fname)
{
FILE *fp;
fopen_s(fp,fname, "rb");
if (fp == NULL){ cout "error" endl; return; }
size_t result;
result=fread(img , sizeof(unsigned char), w*h, fp);
if (result != w*h)
{
cout "Reading error" endl;
return;
}
else
cout "Reading Ok!" endl;
fclose(fp);
}
void mobanjuanji(unsigned char image, unsigned char*image1, int w, int h, float moban[5][5])
{
for (int i = 0; i for (int j = 0; j if (iw - 3 || jh - 3)
image1[Twoto1(i,j,w)] = 0;
else
{
float temp = 0;
for (int m = 0; m5; m++)
for (int n = 0; n5; n++)
{
temp += (image[Twoto1(i-2+m,j-2+n,w)] moban[m][n]);
}
if (temp255) image1[Twoto1(i, j, w)] = 255;
else if (temp0) image1[Twoto1(i, j, w)] = 0;
else image1[Twoto1(i, j, w)] = temp;
}
}
void saveimage(unsigned char *img, int w, int h, char *fname)
{
FILE *fp;
fopen_s(fp, fname, "wb");
if (fp == NULL) { cout "error" endl; return; }
size_t result;
result = fwrite(img, sizeof(unsigned char), w*h, fp);
if (result != w*h)
{
cout "Write error" endl;
return;
}
else
cout "Write Ok!" endl;
fclose(fp);
}
void main()
{
unsigned char *img;
unsigned char *img1;
float moban[5][5] = { {0,0,0,0,0},{0, -1, 0, 1, 0 }, { 0, -2, 0, 2, 0 }, { 0, -1, 0, 1, 0 }, { 0,0,0,0,0 } };
//float moban[5][5] = { 0 };
int w = 512, h = 512;
createimage(img, w, h);
createimage(img1, w, h);
readimage(img, w, h, "E:\ss.raw");
mobanjuanji(img, img1,w, h, moban);
saveimage(img, w, h, "E:\ss_1.raw");
saveimage(img1, w, h, "E:\ss_2.raw");
delateimage(img);
delateimage(img1);
}
扩展资料
C语言实现一个图片的读出和写入
#include stdlib.h
#include windows.h
int file_size(char* filename)//获取文件名为filename的文件大小。
{
FILE *fp = fopen(filename, "rb");//打开文件。
int size;
if(fp == NULL) // 打开文件失败
return -1;
fseek(fp, 0, SEEK_END);//定位文件指针到文件尾。
size=ftell(fp);//获取文件指针偏移量，即文件大小。
fclose(fp);//关闭文件。
return size;
}
int main ()
{
int size=0;
size=file_size("qw");
printf("%d\n",size);
FILE * pFile,*qw;
char *buffer=(char*)malloc(sizeof(char)*size);
qw =fopen("qw","r");
pFile = fopen ( "qwe" , "wb" );
printf("%d==\n",pFile);
printf("%d\n",size);
fread(buffer,1,size,qw);
fwrite (buffer , sizeof(byte), size , pFile );
fclose (pFile);
rename("qwe","Groot.jpg");
return 0;
}
FILE *fp;
if((fp = fopen("sb.jpg","r") == NULL)) {
printf("\nerror");
exit(0);
}
以上仅仅能打开jpg文件，想要显示需要窗口编程。win32或者MFC来实现。
