使用GDI+旋转图像并保存图片的方法，代码如下：
1 #pragma once
2 class CGDIImageFile
3 {
4 public:
5 CGDIImageFile(void);
6 ~CGDIImageFile(void);
7
8 String TypeToFormat(TCHAR cType);
9 bool GetImageCLSID(const TCHAR* mformat,CLSID *pClsid);
10
11 void CreateRotateImage(String& sSrcFile, int nArc, String sDesFile = L"");
12 ULONG_PTR gdiplusToken;
13 };
GDIImageFile.h
1 #include "StdAfx.h"
2 #include "GDIImageFile.h"
3
4 #include <GdiPlus.h>
5 using namespace Gdiplus;
6 #pragma comment(lib,"Gdiplus.lib")
7
8 CGDIImageFile::CGDIImageFile(void)
9 {
10 GdiplusStartupInput gdiplus;
11 GdiplusStartup(&gdiplusToken,&gdiplus,NULL);
12 }
13
14
15 CGDIImageFile::~CGDIImageFile(void)
16 {
17 GdiplusShutdown(gdiplusToken);
18 }
19
20 void CGDIImageFile::CreateRotateImage(String& sSrcFile, int nArc, String sDesFile)
21 {
22 Image *srcImg= new Image(sSrcFile.c_str());
23
24 int nWidth = srcImg->GetWidth();
25 int nHeight = srcImg->GetHeight();
26 //重点在此
27 switch(nArc)
28 {
29 case 90:
30 {
31 srcImg->RotateFlip(Rotate270FlipXY);
32 nWidth = srcImg->GetHeight();
33 nHeight = srcImg->GetWidth();
34 break;
35 }
36 case 180:
37 {
38 srcImg->RotateFlip(RotateNoneFlipX);
39 break;
40 }
41 case 270:
42 {
43 srcImg->RotateFlip(Rotate90FlipXY);
44 nWidth = srcImg->GetHeight();
45 nHeight = srcImg->GetWidth();
46 break;
47 }
48 default:break;
49 }
50
51 Graphics imgGrahpics(srcImg);
52 Bitmap bitmap(nWidth, nHeight, &imgGrahpics);//注意高度和宽度
53 Graphics bmpGraphics(&bitmap);
54 bmpGraphics.DrawImage(srcImg, 0, 0);
55 int nPos = sSrcFile.find(L".");
56 if (nPos == -1)
57 return;
58
59 String encoder;
60 String tmpstr = sSrcFile.substr(nPos + 1,nPos + 2);
61 TCHAR tmpchar = tmpstr[0];
62
63 encoder = TypeToFormat(tmpchar);
64
65 CLSID imgClsid;
66 //GetEncoderClsid()函数是在MSDN中的例子
67 if (!GetImageCLSID(encoder.c_str(),&imgClsid))
68 {
69 return ;
70 }
71 if(sDesFile == L"")
72 sDesFile = sSrcFile + L"_rotate";
73 bitmap.Save(sDesFile.c_str(),&imgClsid,NULL);
74 delete srcImg;
75 }
76
77 bool CGDIImageFile::GetImageCLSID(const TCHAR* mformat,CLSID *pClsid)
78 {
79 UINT num = 0;
80 UINT size = 0;
81
82 ImageCodecInfo *pImageCodecInfo = NULL;
83 GetImageEncodersSize(&num,&size);
84 if (size == 0)
85 {
86 return false;
87 }
88 pImageCodecInfo = new ImageCodecInfo[size];
89 if (pImageCodecInfo == NULL)
90 {
91 return false;
92 }
93
94 GetImageEncoders(num,size,pImageCodecInfo);
95
96 for(UINT i = 0;i < num; i++)
97 {
98 if (wcscmp(pImageCodecInfo[i].MimeType,mformat) == 0)
99 {
100 *pClsid = pImageCodecInfo[i].Clsid;
101 delete[] pImageCodecInfo;
102 return true;
103 }
104 }
105 delete[] pImageCodecInfo;
106 return false;
107 }
108
109 String CGDIImageFile::TypeToFormat(TCHAR cType)
110 {
111 String encoder;
112 switch(cType)
113 {
114 case L‘J‘:
115 case L‘j‘:
116 encoder = L"image/jpeg";
117 break;
118 case L‘B‘:
119 case L‘b‘:
120 encoder = L"image/bmp";
121 break;
122 case L‘G‘:
123 case L‘g‘:
124 encoder = L"image/gif";
125 break;
126 case L‘P‘:
127 case L‘p‘:
128 encoder = L"image/png";
129 break;
130 case L‘T‘:
131 case L‘t‘:
132 encoder = L"image/tiff";
133 break;
134 default:
135 encoder = L"image/jpeg";
136 break;
137 }
138 return encoder;
139 }
GDIImageFile.cpp
使用GDI+的RotateFlip方法 旋转图像并保存图片,布布扣,bubuko.com
时间： 2024-08-04 06:39:11