LNK2019 无法解析的外部符号 WinMain，该符号在函数 "int __cdecl __scrt_common_main_seh(void)"

[huaxiasky]

#define INITGUID
#include <windows.h>
#include <GPEdit.h>
#include <winnt.h>

using namespace std;
HRESULT ModifyUserPolicyForPreventAccessToCmdPrompt(BSTR bGPOPath, int iMode, DWORD lData)
{
HRESULT hr = S_OK;
//
// Use IGroupPolicyObject to retrieve and modify the registry settings.
// for the GPO represented by the gpoInfo.lpDsPath
//
IGroupPolicyObject* p = NULL;
hr = CoCreateInstance(CLSID_GroupPolicyObject,NULL,
CLSCTX_INPROC_SERVER,
IID_IGroupPolicyObject,
(LPVOID*)&p);
if (SUCCEEDED(hr))
{
//
// The GPO value we want to modify is the
//
// User Configuration
// +> Policies
// +>Administrative Templates
// +->System
// +->Prevent access to the command prompt
//
DWORD dwSection = GPO_SECTION_USER;
HKEY hGPOSectionKey = NULL;
DWORD dwData;
HKEY hSettingKey;
LSTATUS rStatus;
hr = 0;
//
//Open the GPO and load its registy values for both: Machine and user
//
hr = p->OpenDSGPO(bGPOPath, GPO_OPEN_LOAD_REGISTRY);
//
// Request the user Registy hive for the GPO
//
hr = p->GetRegistryKey(dwSection, &hGPOSectionKey);
//
// Determine if you want to set it to Not Congigure,
// Enabled or Disabled for the GPO itself.
//
// The second call, RequestSetting will provide the "Yes" or "No"
// value for setting
// the policy as shown by the GPO Editor
//
// iMode
// 0=Not Configured, 1=Enabled, 2=Disabled
//
switch (iMode)
{
case 0:
//
// We do not want to configure the GPO, but we don't want to
// affect other GPOs on the same key,
// so just delete values associated with this
// particular GPO setting.
//
rStatus = RegDeleteValue(hGPOSectionKey,
L"Software\\Policies\\Microsoft\\Windows\\System\\DisableCMD"
);
rStatus = RegDeleteValue(hGPOSectionKey,
L"Software\\Policies\\Microsoft\\Windows\\System\\**del.DisableCMD"
);
break;
case 1:
{
//
// To enable the policy, the DisableCMD value must
// exist and the **del.DisableCMD value must not.
//
// lData:
//
// Check to see if the key for this policy exists.
// If if it does, retrieve a handle
// If not, create it.
//
if (RegOpenKeyEx(hGPOSectionKey,
L"Software\\Policies\\Microsoft\\Windows\\System", 0,
KEY_WRITE, &hSettingKey) != ERROR_SUCCESS)
{
rStatus = RegCreateKeyEx(
hGPOSectionKey,
L"Software\\Policies\\Microsoft\\Windows\\System",
0,
NULL,
REG_OPTION_NON_VOLATILE,
KEY_WRITE,
NULL,
&hSettingKey,
NULL);
}
//
// Set the value DisableCMD and allow, disallow
// script launching of CMD
//
rStatus = RegSetValueEx(hSettingKey, L"DisableCMD",
NULL, REG_DWORD, (BYTE *)(&lData),
sizeof(DWORD));
//
// Remove the not configured value indicator from the hive.
// It may not exist, so the RegDeleteValue may return
// and error, this can be ignored.
//
rStatus = RegDeleteValue(hGPOSectionKey,
L"Software\\Policies\\Microsoft\\Windows\\System\\**del.DisableCMD"
);
rStatus = RegCloseKey(hSettingKey);
break;
}
case 2:
{
//
// Disable the policy.
// must remove the DisableCMD value and add the
// **del.DisableCMD value.
//
// Same stesp as before, check to see if the key for this
// policy exists,
// if not, create it.
//
BOOL bCreate = FALSE;
if (RegOpenKeyEx(hGPOSectionKey, L"Software\\Policies\\Microsoft\\Windows\\System", 0, KEY_WRITE, &hSettingKey) != ERROR_SUCCESS)
{
rStatus = RegCreateKeyEx(
hGPOSectionKey,
L"Software\\Policies\\Microsoft\\Windows\\System",
0,
NULL,
REG_OPTION_NON_VOLATILE,
KEY_WRITE,
NULL,
&hSettingKey,
NULL);
bCreate = TRUE;
}
DWORD dwType = 0;
DWORD cbType = sizeof(dwData);
if (!bCreate)
{
//
// If we did not create the key, then our value
// *may* exist.
// try to read it. If we succeed, write that value back
// to **del.DisableCMD
// if not, then set **del.DisableCMD to 0
//
rStatus = RegGetValue(hGPOSectionKey,
L"Software\\Policies\\Microsoft\\Windows\\System", L"DisableCMD", RRF_RT_ANY, &dwType, (BYTE *)(&dwData), &cbType);
if (rStatus != ERROR_SUCCESS) dwData = 0;
else RegDeleteValue(hSettingKey, L"DisableCMD");
rStatus = RegSetValueEx(hSettingKey, L"**del.DisableCMD", NULL, REG_DWORD, (BYTE *)(&dwData), sizeof(DWORD));
}
else
{
//
// The key was created, just set the **del.DisableCMD
// value to 0
//
dwData = 0;
rStatus = RegSetValueEx(hSettingKey, L"**del.DisableCMD", NULL, REG_DWORD, (BYTE *)(&dwData), sizeof(DWORD));
}
rStatus = RegCloseKey(hSettingKey);
}
}

GUID RegistryId = REGISTRY_EXTENSION_GUID;
GUID ThisAdminToolGuid =
/*{ CLSID_PolicySnapinUser/* */
{
0x0F6B957E,
0x509E,
0x11D1,
{ 0xA7, 0xCC, 0x00, 0x00, 0xF8, 0x75, 0x71, 0xE3 }
};
rStatus = RegCloseKey(hGPOSectionKey);
//
// Write the GPO back to the directory
//
hr = p->Save(
FALSE,
TRUE,
®istryId,
&ThisAdminToolGuid);

hr = p->Release();
}
return hr;
}

可以编译


但是一调试就出问题



运行环境 我本机的操作系统是win7 x64


请问这个要怎么解决呢？

[战在春秋]

工程类型不对。

右键单击项目，选择：
Properties->Linker->System->SubSytem
将 Windows (/SUBSYSTEM:WINDOWS) 修改为 Console (/SUBSYSTEM:CONSOLE)




用心回答每个问题，如果对您有帮助，请采纳答案好吗，谢谢！

[战在春秋]

由向导重新创建工程，选择win32 project。

[huaxiasky]

我改了以后还是出错啊。不过这一次是LIBCMT.lib(exe_main.obj)

[clever101]

楼主，你建的是什么工程？

[clever101]

Disable Unicode in Release Or add the /entry:mainCRTStartup linker flag in Release 参考： Qt project in Visual Studio 2015: “unresolved external symbol wWinMain”

[clever101]

我碰到的编译错误是： 1>MSVCRT.lib(exe_winmain.obj) : error LNK2019: 无法解析的外部符号 WinMain，该符号在函数 "int __cdecl __scrt_common_main_seh(void)" (?__scrt_common_main_seh@@YAHXZ) 中被引用 1>..\..\..\OutDir\Release_x64\test.exe : fatal error LNK1120: 1 个无法解析的外部命令 就是用前一个回复提到的链接解决的。