所以我试图在使用C的Windows API之上创建一个非常简单的抽象库。我创建了一个简单的Makefile,当我尝试使用Msys创建项目时,我得到了这个:
winapi.o: In function `get_client_pid':
(long path)/winapi.c:13: undefined reference to `GetExtendedTcpTable'
(long path)/winapi.c:31: undefined reference to `GetExtendedTcpTable'
collect2.exe: error: ld returned 1 exit status
make: *** [lib] Error 1
和get_client_pid()在winapi.c中定义为
#include <stdint.h>
#include <stdio.h>
#include <windows.h>
#include <Iphlpapi.h>
#define true 1
#define false 0
uint32_t get_client_pid()
{
MIB_TCPTABLE_OWNER_PID *tcpTable;
PDWORD tableSize;
DWORD ret = GetExtendedTcpTable(tcpTable,
tableSize,
true,
2,
TCP_TABLE_OWNER_PID_ALL,
0);
if (ret == NO_ERROR) {
printf("ERROR get_client_pid: No error with table size at 0?\n");
return 0;
}
if (ret != ERROR_INSUFFICIENT_BUFFER) {
printf("ERROR get_client_pid: No insufficient buffer with table size at 0?\n");
return 0;
}
printf("TABLE SIZE %d\n", *tableSize);
tcpTable = malloc(*tableSize);
ret = GetExtendedTcpTable( tcpTable,
tableSize,
true,
2,
TCP_TABLE_OWNER_PID_ALL,
0);
if (ret != NO_ERROR) {
printf("ERROR get_client_pid: GetExtendedTcpTable error: %d\n", ret);
free(tcpTable);
return 0;
}
int i;
for (i = 0; i < tcpTable->dwNumEntries; i++) {
MIB_TCPROW_OWNER_PID row = tcpTable->table[i];
if (row.dwRemotePort == 0x208 && row.dwRemoteAddr == 0x100007F) {
printf("FOUND PROCESS: %d\n", row.dwOwningPid);
free(tcpTable);
return row.dwOwningPid;
}
}
free(tcpTable);
return 0;
}
由于这是一个链接器错误,我将添加我的makefile:
current_dir = $(shell pwd)
all: test
test: lib
gcc -c -g tests.c
gcc -o tests.exe tests.o -L$(current_dir) -lwinapi
lib:
gcc -c -g winapi.c
gcc -shared -o winapi.dll winapi.o -lIphlpapi -luser32
clean:
rm *.o
我必须说我尝试了所有可能的地方插入“-lIphlpapi”以防链接以某种方式错误但没有帮助。
答案 0 :(得分:2)
MinGW在windef.h中将WINVER
定义为0x400
(Windows NT),这意味着Windows的某些新功能将无法链接。
#ifndef WINVER
#define WINVER 0x0400
/*
* If you need Win32 API features newer the Win95 and WinNT then you must
* define WINVER before including windows.h or any other method of including
* the windef.h header.
*/
#endif
因此,您需要自己定义WINVER
以适用于之前的Windows版本,包括任何Windows标头。
使用以下定义之一:
#define WINVER 0x0500 // Windows 2000
#define WINVER 0x0501 // Windows XP
#define WINVER 0x0502 // Windows Server 2003
#define WINVER 0x0600 // Windows Vista, Windows Server 2008
#define WINVER 0x0601 // Windows 7
#define WINVER 0x0602 // Windows 8
#define WINVER 0x0603 // Windows 8.1
#define WINVER 0x0A00 // Windows 10