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| en:docs:fapi:doschgfileptr [2021/08/20 03:22] – prokushev | en:docs:fapi:doschgfileptr [2021/09/17 04:31] (current) – prokushev | ||
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| This call moves the read/write pointer in accordance with the type of move specified. | This call moves the read/write pointer in accordance with the type of move specified. | ||
| - | ==Syntax== | + | ===== Syntax |
| - | | + | <code c> |
| + | DosChgFilePtr (FileHandle, | ||
| + | </ | ||
| + | |||
| + | ===== Parameters ===== | ||
| - | ==Parameters== | ||
| - | * FileHandle ([[HFILE]]) - input : Handle returned by a previous DosOpen call. | + | * FileHandle ([[HFILE]]) - input : Handle returned by a previous |
| * Distance ([[LONG]]) - input : The offset to move, in bytes. | * Distance ([[LONG]]) - input : The offset to move, in bytes. | ||
| * MoveType ([[USHORT]]) - input : Method of moving. Specifies a location in the file from where Distance to move the read/write pointer starts. Values and their meanings are: | * MoveType ([[USHORT]]) - input : Method of moving. Specifies a location in the file from where Distance to move the read/write pointer starts. Values and their meanings are: | ||
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| * NewPointer ([[PULONG]]) - output : Address of the new pointer location. | * NewPointer ([[PULONG]]) - output : Address of the new pointer location. | ||
| - | ==Return Code== | + | ===== Return Code ===== |
| rc ([[USHORT]]) - return | rc ([[USHORT]]) - return | ||
| Line 31: | Line 34: | ||
| * 6 ERROR_INVALID_HANDLE | * 6 ERROR_INVALID_HANDLE | ||
| - | ==Remarks== | + | ===== Remarks ===== |
| The read/write pointer in a file is a signed 32-bit number. A negative value moves the pointer backward in the file. A positive value moves the pointer forward. DosChgFilePtr cannot be used to seek to a negative position in the file. | The read/write pointer in a file is a signed 32-bit number. A negative value moves the pointer backward in the file. A positive value moves the pointer forward. DosChgFilePtr cannot be used to seek to a negative position in the file. | ||
| This call may not be used for a character device or pipe. | This call may not be used for a character device or pipe. | ||
| - | ==Example Code== | + | ===== Example Code ===== |
| - | ===C Binding=== | + | |
| + | ==== C Binding ==== | ||
| <code c> | <code c> | ||
| #define INCL_DOSFILEMGR | #define INCL_DOSFILEMGR | ||
| Line 100: | Line 106: | ||
| </ | </ | ||
| - | ===MASM Binding=== | + | ==== MASM Binding ==== |
| <code asm> | <code asm> | ||
| EXTRN DosChgFilePtr: | EXTRN DosChgFilePtr: | ||
| Line 114: | Line 121: | ||
| - | == Note === | + | ===== Note ===== |
| Text based on http:// | Text based on http:// | ||