我正在为 WH_GETMESSAGE 编写一个全局钩子(Hook)。但是当从 dll 调用 GetProcAddress 函数时,我收到错误代码 127,即 ERROR_PROC_NOT_FOUND。它无法找到 GetMsgProc。知道为什么吗?
另外,我是这种编程的新手,对于任何意外的错误,我深表歉意。
动态链接库文件:
#include "windows.h"
#include <stdio.h>
BOOL APIENTRY DllMain(HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
return TRUE;
}
__declspec(dllexport) LRESULT CALLBACK GetMsgProc(int nCode, WPARAM wParam, LPARAM lParam)
{
MessageBox(NULL, TEXT("I am in"),TEXT("In a DLL"), MB_OK);
return CallNextHookEx(NULL, nCode, wParam, lParam);
}
程序加载DLL文件:
#include <windows.h>
#include <tchar.h>
#include <stdio.h>
typedef LRESULT(CALLBACK *LPGetMsgProc)(int nCode, WPARAM wParam, LPARAM lParam);
int main()
{
HMODULE hDll = LoadLibrary(_T("../../dllTouchInputHook/x64/Debug/dllTouchInputHook.dll"));
LPGetMsgProc proc = (LPGetMsgProc)GetProcAddress(hDll, "GetMsgProc");
if (proc == NULL) {
printf("The error code is %d", GetLastError());
}
HHOOK hMsgHook = SetWindowsHookEx(WH_GETMESSAGE, proc, hDll, 0);
MSG msg;
while (GetMessage(&msg, NULL, 0, 0) > 0) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}
UnhookWindowsHookEx(hMsgHook);
return 0;
}
最佳答案
未找到该函数,因为它没有像您期望的那样导出为 "GetMsgProc"
。它实际上更像是 "_GetMsgProc@12"
(32 位)或 "_GetMsgProc@20"
(64 位)。如果您希望它导出为 "GetMsgProc"
,那么您需要在编译 DLL 时使用 .DEF
文件。
您一开始就不应该以这种方式实现 Hook 。您应该将调用移动到 DLL 本身内部的 SetWindowsHookEx()
,然后导出一个函数来调用它,例如:
#include "windows.h"
#include <stdio.h>
HINSTANCE hThisDLL;
HHOOK hMsgHook;
BOOL APIENTRY DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
{
hThisDLL = hinstDLL;
return TRUE;
}
LRESULT CALLBACK GetMsgProc(int nCode, WPARAM wParam, LPARAM lParam)
{
MessageBox(NULL, TEXT("I am in"), TEXT("In a DLL"), MB_OK);
return CallNextHookEx(NULL, nCode, wParam, lParam);
}
__declspec(dllexport) BOOL WINAPI InstallHook()
{
if (!hMsgHook)
hMsgHook = SetWindowsHookEx(WH_GETMESSAGE, &GetMsgProc, hThisDll, 0);
return (hMsgHook != NULL);
}
__declspec(dllexport) VOID WINAPI UninstallHook()
{
if (hMsgHook)
{
UnhookWindowsHookEx(hMsgHook);
hMsgHook = NULL;
}
}
#include <windows.h>
#include <tchar.h>
#include <stdio.h>
typedef BOOL (WINAPI *LPInstallHook)();
typedef VOID (WINAPI *LPUninstallHook)();
int main()
{
HMODULE hDll = LoadLibrary(_T("../../dllTouchInputHook/x64/Debug/dllTouchInputHook.dll"));
if (!hDll)
{
printf("The error code is %d", GetLastError());
return -1;
}
LPInstallHook installProc = (LPInstallHook) GetProcAddress(hDll, "InstallHook"); // or "_InstallHook"
LPUninstallHook uninstallProc = (installProc) ? (LPUninstallHook) GetProcAddress(hDll, "UninstallHook") : NULL; // or "_UninstallHook"
if (!(installProc && uninstallProc))
{
printf("The error code is %d", GetLastError());
FreeLibrary(hDll);
return -1;
}
if (!installProc())
{
printf("The error code is %d", GetLastError());
FreeLibrary(hDll);
return -1;
}
MSG msg;
while (GetMessage(&msg, NULL, 0, 0) > 0) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}
uninstallProc();
FreeLibrary(hDll);
return 0;
}
关于windows - 调用 GetProcAddress 时出现错误 127,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46777304/