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Read one character less than the buffer size to save room for _tprintf(TEXT("Terminal failure: unable to open file \"%s\" for read.\n"), argv) HFile = CreateFile(argv, // file to openįILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, // normal file Printf("Usage Error: Incorrect number of arguments\n\n") do not use parameters to differentiate between text and binary file types. only for the purposes of output to the screen. Note: this simplified sample assumes the file to read is an ANSI text file G_BytesTransferred = dwNumberOfBytesTransfered
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_tprintf(TEXT("Number of bytes:\t%x\n"), dwNumberOfBytesTransfered) _tprintf(TEXT("Error code:\t%x\n"), dwErrorCode) Tip: You can use the file you created with the previous WriteFile example to test this example. A subsequent call to open this file with CreateFile will succeed if the call uses the same access and sharing modes. In this case, CreateFile succeeds only if the specified file already exists in the current directory. The following example uses CreateFile to open an existing file for reading and ReadFile to read up to 80 characters synchronously from the file. _tprintf(TEXT("ERROR: %s\n"), (LPCTSTR)lpDisplayBuf) Printf("FATAL ERROR: Unable to output error code.\n")
#ERROR OPENING FILE FOR WRITING CODE#
TEXT("%s failed with error code %d as follows:\n%s"), If (FAILED( StringCchPrintf((LPTSTR)lpDisplayBuf, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), Retrieve and output the system error message for the last-error code _tprintf(TEXT("Wrote %d bytes to %s successfully.\n"), dwBytesWritten, argv) Printf("Error: dwBytesWritten != dwBytesToWrite\n") This would not necessarily be the case for success (WriteFile returns TRUE) should write all data as This is an error because a synchronous write that results in Printf("Terminal failure: Unable to write to file.\n") &dwBytesWritten, // number of bytes that were written _tprintf(TEXT("Writing %d bytes to %s.\n"), dwBytesToWrite, argv) ĭwBytesToWrite, // number of bytes to write _tprintf(TEXT("Terminal failure: Unable to open file \"%s\" for write.\n"), argv) HFile = CreateFile(argv, // name of the write Printf("Usage Error:\tIncorrect number of arguments\n\n") Int _cdecl _tmain(int argc, TCHAR *argv)Ĭhar DataBuffer = "This is some test data to write to the file." ĭWORD dwBytesToWrite = (DWORD)strlen(DataBuffer) The following example uses CreateFile to create a new file and open it for writing and WriteFile to write a simple string synchronously to the file.Ī subsequent call to open this file with CreateFile will fail until the handle is closed. When an application creates a new file, the operating system adds it to the specified directory. You must specify the file name, creation instructions, and other attributes. The CreateFile function can create a new file or open an existing file.