CFileDialog dlg(TRUE,"jpg","*.jpg",
OFN_HIDEREADONLY|OFN_OVERWRITEPROMPT,
"JPEG文件(*.jpg)|*.jpg|GIF文件(*.gif)|*.gif||",NULL)
if(dlg.DoModal()==IDOK)
{
m_sPath=dlg.GetPathName()
Invalidate()
}
为简单计,图形显示的代码直接在视类中的仔悄OnDraw中编写,首先打开文件并判断文件的可用性,并把文件内容放到流接口IStream的对象pStm中:
IStream *pStm
CFileStatus fstatus
CFile file
LONG cb
……
if (file.Open(m_Path,CFile::modeRead)&&file.GetStatus(m_Path,fstatus)&&((cb = fstatus.m_size) != -1))
{
HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, cb)
LPVOID pvData = NULL
if (hGlobal != NULL)
{
if ((pvData = GlobalLock(hGlobal)) != NULL)
{
file.ReadHuge(pvData, cb)
GlobalUnlock(hGlobal)
CreateStreamOnHGlobal(hGlobal, TRUE, &pStm)
}
}
}
然后,就直接调用OleLoadPicture函数从流中装载图像:
IPicture *pPic
……
OleLoadPicture(pStm,fstatus.m_size,TRUE,IID_IPicture,(LPVOID*)&pPic))
由于该函数有时会导致失败,所以应当用SUCCEEDED宏来做一些适当的保护工作,只有在数据装载成功的前提下才能继续下面的图像显示工作:
if(SUCCEEDED(OleLoadPicture(pStm,fstatus.m_size,TRUE,IID_IPicture,(LPVOID*)&pPic)))
{
OLE_XSIZE_HIMETRIC hmWidth
OLE_YSIZE_HIMETRIC hmHeight
pPic->get_Width(&hmWidth)
pPic->get_Height(&hmHeight)
double fX,fY
……
fX = (double)pDC->GetDeviceCaps(HORZRES)*(double)hmWidth/((double)pDC->GetDeviceCaps(HORZSIZE)*100.0)
fY = (double)pDC->GetDeviceCaps(VERTRES)*(double)hmHeight/((double)pDC->GetDeviceCaps(VERTSIZE)*100.0)
if(FAILED(pPic->Render(*pDC,0,0,(DWORD)fX,(DWORD)fY,0,hmHeight,hmWidth,-hmHeight,NULL))) {
AfxMessageBox("渲染图樱戚行像失败!")
pPic->Release()
}
else
AfxMessageBox("从流中装载图像失败!")
}
其中,显示工作主要是由IPicture接口对象的Render函数来完成的,该函数主要用来将图片的指定部分画到指定的设备环境的指定位置。原型如下:
HRESULT Render( HDC hdc, //渲染图像用的设备环境句柄
long x, //在hdc上的水平坐标
long y, /脊哗/在hdc上的垂直坐标
long cx, //图像宽度
long cy, //图像高度
OLE_XPOS_HIMETRIC xSrc, //在源图像上的水平偏移
OLE_YPOS_HIMETRIC ySrc, //在源图像上的垂直偏移
OLE_XSIZE_HIMETRIC cxSrc,//在源图像上水平拷贝的数量
OLE_YSIZE_HIMETRIC cySrc,//在源图像上垂直拷贝的数量
LPCRECT prcWBounds //指向目标图元设备环境句柄的指针)
小结:
到此为止,通过上述代码已经能够在程序的客户区内显示JPEG、GIF等标准的图像了,但对于有多帧图片(即有动画)的GIF格式的图像,目前还只能显示第一帧,如要完整的显示GIF 动画的全过程,还需要外部Active X控件的支持。
PS:本文引至于天极网。 还有给你推荐一个编程者的好去处,多去“CSDN”上混,呵呵。
还有对图片的EXIF信息读取看下楼
这个类中构造了两个结构MetadataDetail 和 Metadata ,前者是为了存储EXIF中某元素信息的三种格式,起到中间转化的作用,一个是十六进制的索引信息,一个是没用处理过的信息代码,一个是显示信息。后面的那个结构就是存储一张图片所有EXIF信息元素的。 有两个方法LookupEXIFValue 和 GetEXIFMetaData ,前一个方法是处理特殊元素的对应显示的,后者从图片中读取相关信息然后填充到MetaData结构中。
using System
using System.Drawing
using System.Drawing.Imaging
using System.Collections
using System.ComponentModel
namespace Test.Com
{
/// <summary>
/// 功能:获得图片EXIF信息
/// 作者:Rexsp
/// 创建日期:2004-03-20
/// </summary>
public class EXIFMetaData
{
#region 构造函数
/// <summary>
/// 构造函数
/// </summary>
public EXIFMetaData()
{
}
#endregion
#region 数据转换结构
/// <summary>
/// 转换数据结构
/// </summary>
public struct MetadataDetail
{
public string Hex//十六进制字符串
public string RawValueAsString//原始值串
public string DisplayValue//显示值串
}
#endregion
#region EXIF元素结构
/// <summary>
/// 结构:存储EXIF元素信息
/// </summary>
public struct Metadata
{
public MetadataDetail EquipmentMake
public MetadataDetail CameraModel
public MetadataDetail ExposureTime//曝光时间
public MetadataDetail Fstop
public MetadataDetail DatePictureTaken
public MetadataDetail ShutterSpeed// 快门速度
public MetadataDetail MeteringMode//曝光模式
public MetadataDetail Flash//闪光灯
public MetadataDetail XResolution
public MetadataDetail YResolution
public MetadataDetail ImageWidth//照片宽度
public MetadataDetail ImageHeight//照片高度
public MetadataDetail FNumber// f值,光圈数
public MetadataDetail ExposureProg// 曝光程序
public MetadataDetail SpectralSense//
public MetadataDetail ISOSpeed// ISO感光度
public MetadataDetail OECF//
public MetadataDetail Ver// EXIF版本
public MetadataDetail CompConfig// 色彩设置
public MetadataDetail CompBPP// 压缩比率
public MetadataDetail Aperture// 光圈值
public MetadataDetail Brightness// 亮度值Ev
public MetadataDetail ExposureBias// 曝光补偿
public MetadataDetail MaxAperture// 最大光圈值
public MetadataDetail SubjectDist// 主体距离
public MetadataDetail LightSource// 白平衡
public MetadataDetail FocalLength// 焦距
public MetadataDetail FPXVer// FlashPix版本
public MetadataDetail ColorSpace// 色彩空间
public MetadataDetail Interop//
public MetadataDetail FlashEnergy//
public MetadataDetail SpatialFR//
public MetadataDetail FocalXRes//
public MetadataDetail FocalYRes//
public MetadataDetail FocalResUnit//
public MetadataDetail ExposureIndex// 曝光指数
public MetadataDetail SensingMethod// 感应方式
public MetadataDetail SceneType//
public MetadataDetail CfaPattern//
}
#endregion
#region 查找EXIF元素值
public string LookupEXIFValue(string Description, string Value)
{
string DescriptionValue = null
switch(Description)
{
case "MeteringMode":
#region MeteringMode
{
switch(Value)
{
case "0":
DescriptionValue = "Unknown"break
case "1":
DescriptionValue = "Average"break
case "2":
DescriptionValue = "Center Weighted Average"break
case "3":
DescriptionValue = "Spot"break
case "4":
DescriptionValue = "Multi-spot"break
case "5":
DescriptionValue = "Multi-segment"break
case "6":
DescriptionValue = "Partial"break
case "255":
DescriptionValue = "Other"break
}
}
#endregion
break
case "ResolutionUnit":
#region ResolutionUnit
{
switch(Value)
{
case "1":
DescriptionValue = "No Units"break
case "2":
DescriptionValue = "Inch"break
case "3":
DescriptionValue = "Centimeter"break
}
}
#endregion
break
//省略N行相似代码
}
return DescriptionValue
}
#endregion
#region 取得图片的EXIF信息
public Metadata GetEXIFMetaData(string PhotoName)
{
// 创建一个图片的实例
System.Drawing.Image MyImage = System.Drawing.Image.FromFile(PhotoName)
// 创建一个整型数组来存储图像中属性数组的ID
int[] MyPropertyIdList = MyImage.PropertyIdList
//创建一个封闭图像属性数组的实例
PropertyItem[] MyPropertyItemList = new PropertyItem[MyPropertyIdList.Length]
//创建一个图像EXIT信息的实例结构对象,并且赋初值
#region 创建一个图像EXIT信息的实例结构对象,并且赋初值
Metadata MyMetadata = new Metadata()
MyMetadata.EquipmentMake.Hex = "10f"
MyMetadata.CameraModel.Hex = "110"
MyMetadata.DatePictureTaken.Hex = "9003"
MyMetadata.ExposureTime.Hex = "829a"
MyMetadata.Fstop.Hex = "829d"
MyMetadata.ShutterSpeed.Hex = "9201"
MyMetadata.MeteringMode.Hex = "9207"
MyMetadata.Flash.Hex = "9209"
MyMetadata.FNumber.Hex = "829d"//
MyMetadata.ExposureProg.Hex = ""//
MyMetadata.SpectralSense.Hex = "8824"//
MyMetadata.ISOSpeed.Hex = "8827"//
MyMetadata.OECF.Hex = "8828"//
MyMetadata.Ver.Hex = "9000"//
MyMetadata.CompConfig.Hex = "9101"//
MyMetadata.CompBPP.Hex = "9102"//
MyMetadata.Aperture.Hex = "9202"//
MyMetadata.Brightness.Hex = "9203"//
MyMetadata.ExposureBias.Hex = "9204"//
MyMetadata.MaxAperture.Hex = "9205"//
MyMetadata.SubjectDist.Hex = "9206"//
MyMetadata.LightSource.Hex = "9208"//
MyMetadata.FocalLength.Hex = "920a"//
MyMetadata.FPXVer.Hex = "a000"//
MyMetadata.ColorSpace.Hex = "a001"//
MyMetadata.FocalXRes.Hex = "a20e"//
MyMetadata.FocalYRes.Hex = "a20f"//
MyMetadata.FocalResUnit.Hex = "a210"//
MyMetadata.ExposureIndex.Hex = "a215"//
MyMetadata.SensingMethod.Hex = "a217"//
MyMetadata.SceneType.Hex = "a301"
MyMetadata.CfaPattern.Hex = "a302"
#endregion
// ASCII编码
System.Text.ASCIIEncoding Value = new System.Text.ASCIIEncoding()
int index = 0
int MyPropertyIdListCount=MyPropertyIdList.Length
if(MyPropertyIdListCount!=0)
{
foreach (int MyPropertyId in MyPropertyIdList)
{
string hexVal = ""
MyPropertyItemList[index] = MyImage.GetPropertyItem(MyPropertyId)
#region 初始化各属性值
string myPropertyIdString=MyImage.GetPropertyItem(MyPropertyId).Id.ToString("x")
switch(myPropertyIdString)
{
case "10f":
{
MyMetadata.EquipmentMake.RawValueAsString =BitConverter.ToString(MyImage.GetPropertyItem (MyPropertyId).Value)
MyMetadata.EquipmentMake.DisplayValue = Value.GetString(MyPropertyItemList[index].Value)
break
}
case "110":
{
MyMetadata.CameraModel.RawValueAsString =BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value)
MyMetadata.CameraModel.DisplayValue =Value.GetString(MyPropertyItemList[index].Value)
break
}
case "9003":
{
MyMetadata.DatePictureTaken.RawValueAsString =BitConverter.ToString(MyImage.GetPropertyItem(MyPropertyId).Value)
MyMetadata.DatePictureTaken.DisplayValue =Value.GetString(MyPropertyItemList[index].Value)
break
}
//省略N行相似代码
}
#endregion
index++
}
}
MyMetadata.XResolution.DisplayValue = MyImage.HorizontalResolution.ToString()
MyMetadata.YResolution.DisplayValue = MyImage.VerticalResolution.ToString()
MyMetadata.ImageHeight.DisplayValue = MyImage.Height.ToString()
MyMetadata.ImageWidth.DisplayValue = MyImage.Width.ToString()
MyImage.Dispose()
return MyMetadata
}
#endregion
}
}
然后就是个调用的问题,有了这个类,我如何读取图片的EXIF信息呢?代码如下:
EXIFMetaData em = new EXIFMetaData()
string filePath=Server.MapPath("Test.jpg")//这里可以动态传递图片路径的
EXIFMetaData.Metadata m = em.GetEXIFMetaData(filePath)//这里就是调用,传图片绝对路径
string exif = m.Ver.DisplayValue
string camera = m.CameraModel.DisplayValue
string model = m.CameraModel.DisplayValue
string aperture = m.Aperture.DisplayValue
string shutter = m.ShutterSpeed.DisplayValue
string sensitive = m.ExposureIndex.DisplayValue
#include <<a href="https://www.baidu.com/s?wd=stdlib.h&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1Y3rjb4rAFWPWuWnhmLmvNW0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EPHf3PHT4P1md" target="_blank" class="baidu-highlight">stdlib.h</a>>#include <<a href="https://www.baidu.com/s?wd=stdio.h&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1Y3rjb4rAFWPWuWnhmLmvNW0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EPHf3PHT4P1md" target="_blank" class="baidu-highlight">stdio.h<脊隐/a>>
int main ()
{
FILE * fpPhoto, * fpText, * fpTarget
int iRead
charszBuf[100]
printf ("请输入第一樱滑厅个文件名(bmp):\n")
gets (szBuf)
fpPhoto = fopen (szBuf, "rb")
printf ("请输入第二个文件名(txt):\n")
gets (szBuf)
fpText = fopen (szBuf, "rb")
printf ("请输入目的文件名(bmp):\让梁n")
gets (szBuf)
fpTarget = fopen (szBuf, "wb")
if (!fpPhoto || !fpText || !fpTarget)
{
printf ("打开文件失败!\n")
system("pause")
return -1
}
while ((iRead = fread (szBuf, 1, sizeof (szBuf), fpPhoto)) >0)
fwrite (szBuf, 1, iRead, fpTarget)
while ((iRead = fread (szBuf, 1, sizeof (szBuf), fpText)) >0)
fwrite (szBuf, 1, iRead, fpTarget)
fclose (fpPhoto)
fclose (fpText)
fclose (fpTarget)
return 0
}
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