DosPutMessage
Sends a message to an output file or device.
Syntax
DosPutMessage(hfile, cbMsg, pBuf)
Parameters
- hfile (HFILE) - input
- The handle of the output file or device.
- cbMsg (ULONG) - input
- The length, in bytes, of the message to be sent.
- pBuf (PCHAR) - input
- The buffer that contains the message to be sent.
Return Code
- ulrc (APIRET) - returns
- DosPutMessage returns one of the following values:
- 0 NO_ERROR
- 6 ERROR_INVALID_HANDLE
- 19 ERROR_WRITE_PROTECT
- 87 ERROR_INVALID_PARAMETER
- 321 ERROR_MR_UN_PERFORM
Remarks
DosPutMessage sends a message that is currently in a buffer to an output file or device.
Screen width is assumed to be 80 characters. If a word would go past column 78, it is moved to the beginning (column 1) of a new line.
DosPutMessage assumes that the starting cursor position is column 1 when handling a word wrap. If the last character to be positioned on a line is a double-byte character, the character is not bisected.
Example Code
This example sends a message to the output file "MYMSG.DAT", automatically wrapping if necessary.
#define INCL_DOSFILEMGR /* File Manager values */
#define INCL_DOSMISC /* Miscellaneous values */
#define INCL_DOSERRORS /* DOS Error values */
#include <os2.h>
#include <stdio.h>
#include <string.h>
int main(VOID) {
HFILE FileHandle = NULLHANDLE; /* File handle */
ULONG ulAction = 0; /* Action taken by DosOpen */
UCHAR uchDataArea[160] = ""; /* Message buffer */
APIRET rc = 0; /* Return code */
rc = DosOpen ("MYMSG.DAT", &FileHandle, &ulAction, 120L, FILE_ARCHIVED,
OPEN_ACTION_CREATE_IF_NEW | OPEN_ACTION_OPEN_IF_EXISTS,
OPEN_FLAGS_NOINHERIT | OPEN_SHARE_DENYREADWRITE |
OPEN_ACCESS_READWRITE, 0L);
strcpy (uchDataArea, "This is a sample message that is going to be written ");
strcat (uchDataArea, "to the message file. It is longer than 80");
strcat (uchDataArea, " characters, so it should wrap. ");
rc = DosPutMessage(FileHandle, strlen(uchDataArea), uchDataArea);
if (rc != NO_ERROR) {
printf("DosPutMessage error: return code = %u\n", rc);
return 1;
}
rc = DosClose(FileHandle);
return NO_ERROR;
}