#include "stdafx.h"#include 
     
      #include 
      
       #include 
       
        #include 
        
         #include 
         
          #pragma comment(lib,"crypt32.lib")using namespace std;void MyhandlError(char *s){	fprintf(stderr,"This is a error.\n");	fprintf(stderr	,"Current error :%x.\n",GetLastError());	fprintf(stderr,"Error info:%s.\n",s);	exit(1);}int main(int argc,char* argv[]){	DATA_BLOB Datain;	DATA_BLOB DataOut;	DATA_BLOB Dataput;	BYTE *pbdata = (BYTE*)"Hello word,this is a testing?";	DWORD cbdatalen = strlen((char*)pbdata) + 1;	LPWSTR pbtest = NULL;	printf("Pbdata len length is %d.\n",cbdatalen);	Datain.pbData = pbdata;	Datain.cbData = cbdatalen;	if (CryptProtectData(&Datain,NULL,NULL,NULL,NULL,0,&DataOut))	{		printf("The encodeCrypt Dta Is :%s.\n",DataOut.pbData);		FILE *fp;		fp = fopen("1.txt","wb");		fwrite(DataOut.pbData,cbdatalen,1,fp);		fclose(fp);	}else	{		MyhandlError("Error in CryptprotecDta.\n");	}	if (CryptUnprotectData(&DataOut,&pbtest,NULL,NULL,NULL,0,&Dataput))	{		 printf("The decrypted data is: %s\n", Dataput.pbData);		FILE *fp1;		fp1 = fopen("2.txt","wb");		fwrite(Dataput.pbData,cbdatalen,1,fp1);		fclose(fp1);	}else	{		MyhandlError("Error in decode.\n");	}	LocalFree(DataOut.pbData);	LocalFree(Dataput.pbData);	return 0;} 输出:
         
        
       
      
     

E:\windows\Test\Debug>Test.exe

Pbdata len length is 30.

The encodeCrypt Dta Is :..

The decrypted data is: Hello word,this is a testing?