给图片添加水印

转载：https://blog.51cto.com/zgqwork/389804

说明：

1.需要添加头文件，以及配置工程属性才能运行(个人没有配置成功，但是放到项目里可以运行成功);

2.不要头文件     #include "atlp_w_picpath.h";

3.  

GetEncoderClsidOwn(L"p_w_picpath/jpeg", &encoderClsid);

这里有问题，似乎没有这种格式。如果水印图片是png格式的，这里应该是

GetEncoderClsidOwn(L"image/png", &encoderClsid);

原代码：

 1 #include "stdafx.h"
 2 #include "gdiplus.h"
 3 #include "atlp_w_picpath.h"
 4 using namespace Gdiplus;
 5 #include <string>
 6 using namespace std;
 7 GdiplusStartupInput gSDKdiplusStartupInput = 0;
 8 ULONG_PTR gSDKdiplusToken = 0;
 9 
10 int GetEncoderClsidOwn(const WCHAR* format, CLSID* pClsid)
11 {
12  UINT  num = 0;          // number of p_w_picpath encoders
13  UINT  size = 0;         // size of the p_w_picpath encoder array in bytes
14 
15  ImageCodecInfo* pImageCodecInfo = NULL;
16 
17  GetImageEncodersSize(&num, &size);
18  if(size == 0)
19   return -1;  // Failure
20 
21  pImageCodecInfo = (ImageCodecInfo*)(malloc(size));
22  if(pImageCodecInfo == NULL)
23   return -1;  // Failure
24 
25  GetImageEncoders(num, size, pImageCodecInfo);
26 
27  for(UINT j = 0; j < num; ++j)
28  {
29   if( wcscmp(pImageCodecInfo[j].MimeType, format) == 0 )
30   {
31    *pClsid = pImageCodecInfo[j].Clsid;
32    free(pImageCodecInfo);
33    return j;  // Success
34   }   
35  }
36 
37  free(pImageCodecInfo);
38  return -1;  // Failure
39 }
40 
41 void main()
42 
43 {
44 
45 GdiplusStartup(&gSDKdiplusToken, &gSDKdiplusStartupInput, NULL);
46 
47  USES_CONVERSION;
48   FontFamily  fontFamily(L"Arial");
49   float fontSize = 12*(float)abs(2);
50   Font        font(&fontFamily, fontSize, FontStyleBold, UnitPixel);
51   SolidBrush  blackBrush(Color(0, 0, 0));
52   PointF pointF(1, 1);
53   CLSID encoderClsid;
54   GetEncoderClsidOwn(L"p_w_picpath/jpeg", &encoderClsid);
55   string filename;
56   WCHAR wfilename[MAX_PATH];
57   for(int i=0;i<20;i++)
58   {
59    filename = "out_";
60    char str[4];
61    itoa(i, str, 10);
62    filename = filename+str;
63    filename=filename+".jpg";
64    memset(wfilename,0,MAX_PATH);
65    wcscpy(wfilename, T2W(filename.c_str()) );
66    Bitmap bmp(L"sample.jpg");
67    Graphics g(&bmp);
68    g.DrawString(wfilename, -1, &font, pointF, &blackBrush);
69    bmp.Save(wfilename,&encoderClsid);
70    printf("%d\n",i);
71   }
72 
73 GdiplusShutdown(gSDKdiplusToken);
74 
75 }

 

posted @ 2020-09-25 17:08  _KikyoBK  Views(218)  Comments(0)  Edit  收藏  举报