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【C】图片数据转BASE64编码

作者:柯西不是你 / 发布于2014/9/20/ 735

将图片数据转化成BASE64编码


	const BYTE Base64ValTab[65]= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
	
	#define AVal(x) Base64ValTab[x]
	
	BSTR Base64Encode(char * pInput)
	{
	 CFile ImageFile;
	 ImageFile.Open(pInput,CFile::modeRead);
	 int iSrcLen = ImageFile.GetLength();
	
	 unsigned char * szImageBin;
	 szImageBin = new unsigned char[iSrcLen];
	 ImageFile.Read((void*)szImageBin,iSrcLen);
	
	 char *base64code;
	 int nRemain = iSrcLen % 3;
	 int nLeast= 0;
	
	 if(nRemain != 0)
	 {
	 nLeast=1;
	 }
	 base64code = new char[(iSrcLen/3+nLeast)*4 + 1];
	
	 int loop = 0;
	 int iDstLen = 0;
	
	 loop = iSrcLen/3;
	
	 int datavalue;
	
	 for (int i =0 ; i < loop; i++)
	 {
	 datavalue = ((szImageBin[3*i] << 16) | (szImageBin[3*i+1] << 8) | szImageBin[3*i+2]);
	 for(int j = 0; j < 4; j++)
	 {
	 base64code[i*4+j] = AVal(((datavalue >> 6*(3-j)) & 0x3F));
	 }
	 }
	
	 iDstLen = i*4;
	
	 if (nRemain == 1)
	 {
	 i = iSrcLen-1;
	 int a1 = ((szImageBin[i] & 0xFC)>>2)&0xFF;
	 int a2 = ((szImageBin[i] & 0x03)<<4)&0xFF;
	
	 base64code[iDstLen++] = AVal(a1);
	 base64code[iDstLen++] = AVal(a2);
	 base64code[iDstLen++] = '=';
	 base64code[iDstLen++] = '=';
	 base64code[iDstLen] = 0x00;
	 }
	 else if (nRemain == 2)
	 {
	 i = iSrcLen-2;
	
	 int a1 = (szImageBin[i] & 0xFC)&0xFF;
	 int a2 = ((szImageBin[i] & 0x03)<<4 | (szImageBin[i+1] & 0xF0)>>4)&0xFF;
	 int a3 = ((szImageBin[i+1] & 0x0F)<<2 )&0xFF;
	
	 base64code[iDstLen++] = AVal(a1);
	 base64code[iDstLen++] = AVal(a2);
	 base64code[iDstLen++] = AVal(a3);
	 base64code[iDstLen++] = '=';
	 base64code[iDstLen] = 0x00;
	 }
	 else
	 {
	 base64code[iDstLen] = 0x00;
	 }
	
	 CString szBaseCode(base64code);
	 free(szImageBin);
	 free(base64code);
	 ImageFile.Close();
	 return szBaseCode.AllocSysString();
	}

试试其它关键字

　BASE64　

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.图片数据转BASE64编码