以下代码取自
here.我在Windows 7上工作时删除了所有Windows NT部分.
原文链接：https://www.f2er.com/windows/364884.html我复制了这段代码并在visual studio 2010中运行(新项目 – > VC – > CLR-> CLR控制台……).但它提供了许多未解决的外部’c’错误,如代码下方列出的那样.我犯了什么错？
#define STRICT 1
#include <windows.h>
#include <iostream>
using namespace std;
BOOL CALLBACK EnumWindowsProc(HWND hWnd,LPARAM lParam) {
DWORD dwThreadId,dwProcessId;
HINSTANCE hInstance;
char String[255];
HANDLE hProcess;
if (!hWnd)
return TRUE; // Not a window
if (!::IsWindowVisible(hWnd))
return TRUE; // Not visible
if (!SendMessage(hWnd,WM_GETTEXT,sizeof(String),(LPARAM)String))
return TRUE; // No window title
hInstance = (HINSTANCE)GetWindowLong(hWnd,GWL_HINSTANCE);
dwThreadId = GetWindowThreadProcessId(hWnd,&dwProcessId);
hProcess = OpenProcess(PROCESS_ALL_ACCESS,FALSE,dwProcessId);
cout << hWnd << ' ' << dwProcessId << '\t' << String << '\t';
cout << "(None)\n";
CloseHandle(hProcess);
return TRUE;
}
int main(int argc,char *argv[],char *envp[]) {
EnumWindows(EnumWindowsProc,NULL);
return 0;
}
这给出了以下错误(和其他类似的未解决的extern C错误)
1>wndowfind.obj : error LNK2028: unresolved token (0A000342) "extern "C" int __stdcall EnumWindows(int (__stdcall*)(struct HWND__ *,long),long)" 3 (?EnumWindows@@$$J18YGHP6GHPAUHWND__@@J@ZJ@Z) referenced in function "int __cdecl main(int,char * * const,char * * const)" (?main@@$$HYAHHQAPAD0@Z) 1>wndowfind.obj : error LNK2028: unresolved token (0A000346) "extern "C" unsigned long __stdcall GetWindowThreadProcessId(struct HWND__ *,unsigned long *)" (?GetWindowThreadProcessId@@$$J18YGKPAUHWND__@@PAK@Z) referenced in function "int __stdcall EnumWindowsProc(struct HWND__ *,long)" (?EnumWindowsProc@@$$FYGHPAUHWND__@@J@Z) 1>wndowfind.obj : error LNK2028: unresolved token (0A000347) "extern "C" long __stdcall GetWindowLongW(struct HWND__ *,int)" (?GetWindowLongW@@$$J18YGJPAUHWND__@@H@Z) referenced in function "int __stdcall EnumWindowsProc(struct HWND__ *,long)" (?EnumWindowsProc@@$$FYGHPAUHWND__@@J@Z) 1>wndowfind.obj : error LNK2019: unresolved external symbol "extern "C" int __stdcall EnumWindows(int (__stdcall*)(struct HWND__ *,long)" (?EnumWindows@@$$J18YGHP6GHPAUHWND__@@J@ZJ@Z) referenced in function "int __cdecl main(int,char * * const)" (?main@@$$HYAHHQAPAD0@Z) 1>c:\users\afnan\documents\visual studio 2010\Projects\wndowfind\Debug\wndowfind.exe : fatal error LNK1120: 10 unresolved externals 1> 1>Build Failed.
更新
通过包含库(如答案中所示),我能够成功运行该程序.但我无法理解为什么只有字符串的第一个字符打印而不是完整字符,如输出中所示：
00010060 2652 S (None) 002502B2 5820 C (None) 00090402 5160 w (None) 00050392 5160 w (None) 00060292 3520 F (None) 000C02BA 3520 M (None) 0001021A 3736 E (None) 00040018 896 I (None) 00010170 3580 A (None) 0002003E 2684 D (None) 00030316 4956 N (None) 000202DE 3736 D (None) 0001031E 2652 S (None) 000100EA 2652 P (None)
在上面的输出中,S实际上是“开始”,C是“控制台”等我通过间谍工具确认.
如何打印完整的字符串而不是第一个字符？
