PathCombineW function (shlwapi.h)

Článek
02/09/2023

Concatenates two strings that represent properly formed paths into one path; also concatenates any relative path elements.

Note Misuse of this function can lead to a buffer overrun. We recommend the use of the safer PathCchCombine or PathCchCombineEx function in its place.

Syntax

LPWSTR PathCombineW(
  [out]          LPWSTR  pszDest,
  [in, optional] LPCWSTR pszDir,
  [in]           LPCWSTR pszFile
);

Parameters

[out] pszDest

Type: LPTSTR

A pointer to a buffer that, when this function returns successfully, receives the combined path string. You must set the size of this buffer to MAX_PATH to ensure that it is large enough to hold the returned string.

[in, optional] pszDir

Type: LPCTSTR

A pointer to a null-terminated string of maximum length MAX_PATH that contains the first path. This value can be NULL.

[in] pszFile

Type: LPCTSTR

A pointer to a null-terminated string of maximum length MAX_PATH that contains the second path. This value can be NULL.

Return value

Type: LPTSTR

A pointer to a buffer that, when this function returns successfully, receives the concatenated path string. This is the same string pointed to by pszPathOut. If this function does not return successfully, this value is NULL.

Remarks

The directory path should be in the form of A:,B:, ..., Z:. The file path should be in a correct form that represents the file name part of the path. If the directory path ends with a backslash, the backslash will be maintained. Note that while lpszDir and lpszFile are both optional parameters, they cannot both be NULL.

Examples

#include <windows.h>
#include <iostream.h>
#include "Shlwapi.h"

int main( void )
{
// Buffer to hold combined path.
char buffer_1[MAX_PATH] = "";
char *lpStr1;
lpStr1 = buffer_1;

// String for balance of path name.
char buffer_2[ ] = "One\\Two\\Three";
char *lpStr2;
lpStr2 = buffer_2;

// String for directory name.
char buffer_3[ ] = "C:";
char *lpStr3;
lpStr3 = buffer_3;

cout << "The file path to be combined is  " 
     << lpStr2 << endl;
cout << "The directory name path is       " 
     << lpStr3 << endl;
cout << "The combined path is             " 
     << PathCombine(lpStr1,lpStr3,lpStr2) << endl;
}

------------
INPUT:
------------
Path for directory part: "C:"
Path for file part: "One\Two\Three"
------------
OUTPUT:
------------
The file path to be combined is  One\Two\Three
The directory name path is       C:
The combined path is             C:\One\Two\Three

Note

The shlwapi.h header defines PathCombine as an alias which automatically selects the ANSI or Unicode version of this function based on the definition of the UNICODE preprocessor constant. Mixing usage of the encoding-neutral alias with code that not encoding-neutral can lead to mismatches that result in compilation or runtime errors. For more information, see Conventions for Function Prototypes.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional, Windows XP [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	shlwapi.h
Library	Shlwapi.lib
DLL	Shlwapi.dll (version 4.71 or later)

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