Convert base64 string to pdf in c

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Convert base64 string to pdf in c

abeda 2 I have a wstring that has a base 64 string. I need to extract a byte array from this base 64 string. How can I do this? I am implementing a COM Server in C++. Please help 5 7896 donbock 2,422 Expert 2GB Please clarify what you want to do. It would help if you provided an example showing the expected output for a particular input value. abeda 2 Basically, I have a .Net component (in C#) that would send the stream of bytes to my COM server after converting it into a base 64 string as follows: //.Net code byte[] arr = new byte[2]; arr[0] = 1; arr[1] = 2; string dataByteStream = Convert.ToBase64String(arr); //In this case the value of dataByteStream will be "AQI=" This string is recieved in my C++ COM Server in a function called NotifyData(BSTR myDataByteStream). The .Net Component basically calls on one of the interface functions ( NotifyData(BSTR myData) ) of Com server by passing this string as argument. I am currently implementing the function NotifyData in COM Server. I want to now extract the byte array out of this string in C++. My objective is to get back the byte array with elements 1 and 2 which is the original data in my COM Server. My function in COM Server looks like this: NotifyData(BSTR myData) { wstring myDataBytes = myData; //base64 string containing "AQI=" byte *pArr = new byte[2]; memset(pArr ,0,2); //Do something to get the original byte array into pArr such that pArr[0] = 1 and pArr[1] = 2 } johny10151981 1,059 1GB This is not an answer. just a discussion Why did you declare myData as BSTR. cant you just define as string? cause in the calling function you are using string to store base64 data besides Base64 encoded data only contain ASCII data not multibyte data is present there. To understand base64 please check base64 RFC. even though wstring will not change the data that would be passed to NotifyData. but (I am not sure) wouldnt it make type casting error? by the way what is wstring? in visual C i have used wchar_t. this is 16bit in wchar_t data is stored as two byte. say if you store 'a' to wchar_t it would be equivalent to "0a"(char[2]). hype261 207 100+ Johny, wstring is just a typedef of std::basic_string where string is just a typedef of std::basic_string Sign in to post your reply or Sign up for a free account. public class Base64 extends Object java.lang.Object android.util.Base64 Utilities for encoding and decoding the Base64 representation of binary data. See RFCs 2045 and 3548. int CRLF Encoder flag bit to indicate lines should be terminated with a CRLF pair instead of just an LF. int DEFAULT Default values for encoder/decoder flags. int NO_CLOSE Flag to pass to Base64OutputStream to indicate that it should not close the output stream it is wrapping when it itself is closed. int NO_PADDING Encoder flag bit to omit the padding '=' characters at the end of the output (if any). int NO_WRAP Encoder flag bit to omit all line terminators (i.e., the output will be on one long line). int URL_SAFE Encoder/decoder flag bit to indicate using the "URL and filename safe" variant of Base64 (see RFC 3548 section 4) where - and _ are used in place of + and /. static byte[] decode(String str, int flags) Decode the Base64-encoded data in input and return the data in a new byte array. static byte[] decode(byte[] input, int flags) Decode the Base64-encoded data in input and return the data in a new byte array. static byte[] decode(byte[] input, int offset, int len, int flags) Decode the Base64-encoded data in input and return the data in a new byte array. static byte[] encode(byte[] input, int flags) Base64-encode the given data and return a newly allocated byte[] with the result. static byte[] encode(byte[] input, int offset, int len, int flags) Base64-encode the given data and return a newly allocated byte[] with the result. static String encodeToString(byte[] input, int offset, int len, int flags) Base64-encode the given data and return a newly allocated String with the result. static String encodeToString(byte[] input, int flags) Base64-encode the given data and return a newly allocated String with the result. From class java.lang.Object Object clone() Creates and returns a copy of this object. boolean equals(Object obj) Indicates whether some other object is "equal to" this one. void finalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. final Class getClass() Returns the runtime class of this Object. int hashCode() Returns a hash code value for the object. final void notify() Wakes up a single thread that is waiting on this object's monitor. final void notifyAll() Wakes up all threads that are waiting on this object's monitor. String toString() Returns a string representation of the object. final void wait(long timeout, int nanos) Causes the current thread to wait until another thread invokes the notify() method or the notifyAll() method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed. final void wait(long timeout) Causes the current thread to wait until either another thread invokes the notify() method or the notifyAll() method for this object, or a specified amount of time has elapsed. final void wait() Causes the current thread to wait until another thread invokes the notify() method or the notifyAll() method for this object. Constants public static final int CRLF Encoder flag bit to indicate lines should be terminated with a CRLF pair instead of just an LF. Has no effect if NO_WRAP is specified as well. Constant Value: 4 (0x00000004) public static final int DEFAULT Default values for encoder/decoder flags. Constant Value: 0 (0x00000000) public static final int NO_CLOSE Flag to pass to Base64OutputStream to indicate that it should not close the output stream it is wrapping when it itself is closed. Constant Value: 16 (0x00000010) public static final int NO_PADDING Encoder flag bit to omit the padding '=' characters at the end of the output (if any). Constant Value: 1 (0x00000001) public static final int NO_WRAP Encoder flag bit to omit all line terminators (i.e., the output will be on one long line). Constant Value: 2 (0x00000002) public static final int URL_SAFE Encoder/decoder flag bit to indicate using the "URL and filename safe" variant of Base64 (see RFC 3548 section 4) where - and _ are used in place of + and /. Constant Value: 8 (0x00000008) Public methods public static byte[] decode (String str, int flags) Decode the Base64-encoded data in input and return the data in a new byte array. The padding '=' characters at the end are considered optional, but if any are present, there must be the correct number of them. Parameters str String: the input String to decode, which is converted to bytes using the default charset flags int: controls certain features of the decoded output. Pass DEFAULT to decode standard Base64. Throws IllegalArgumentException if the input contains incorrect padding public static byte[] decode (byte[] input, int flags) Decode the Base64-encoded data in input and return the data in a new byte array. The padding '=' characters at the end are considered optional, but if any are present, there must be the correct number of them. Parameters input byte: the input array to decode flags int: controls certain features of the decoded output. Pass DEFAULT to decode standard Base64. Throws IllegalArgumentException if the input contains incorrect padding public static byte[] decode (byte[] input, int offset, int len, int flags) Decode the Base64-encoded data in input and return the data in a new byte array. The padding '=' characters at the end are considered optional, but if any are present, there must be the correct number of them. Parameters input byte: the data to decode offset int: the position within the input array at which to start len int: the number of bytes of input to decode flags int: controls certain features of the decoded output. Pass DEFAULT to decode standard Base64. Throws IllegalArgumentException if the input contains incorrect padding public static byte[] encode (byte[] input, int flags) Base64-encode the given data and return a newly allocated byte[] with the result. Parameters input byte: the data to encode flags int: controls certain features of the encoded output. Passing DEFAULT results in output that adheres to RFC 2045. public static byte[] encode (byte[] input, int offset, int len, int flags) Base64-encode the given data and return a newly allocated byte[] with the result. Parameters input byte: the data to encode offset int: the position within the input array at which to start len int: the number of bytes of input to encode flags int: controls certain features of the encoded output. Passing DEFAULT results in output that adheres to RFC 2045. public static String encodeToString (byte[] input, int offset, int len, int flags) Base64-encode the given data and return a newly allocated String with the result. Parameters input byte: the data to encode offset int: the position within the input array at which to start len int: the number of bytes of input to encode flags int: controls certain features of the encoded output. Passing DEFAULT results in output that adheres to RFC 2045. public static String encodeToString (byte[] input, int flags) Base64-encode the given data and return a newly allocated String with the result. Parameters input byte: the data to encode flags int: controls certain features of the encoded output. Passing DEFAULT results in output that adheres to RFC 2045.

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