Windows：使用 FreePascal 调用 WMI 函数——工作示例？
Windows: Calling a WMI function using FreePascal -- Working example?
我正在寻找有关如何调用 WMI 函数的示例代码。有没有人在 FreePascal 中有一个工作示例，最好包括有关如何将参数传递给函数的代码？不幸的是，“Delphi WMI code Creator”对我没有帮助，因为用于创建函数的 FreePascal 代码不起作用。
明确一点：这不是查询 WMI 属性，而是调用类似 Win32_Printer.AddPrinterConnection 的函数（仅举个例子）。
要调用 WMI 函数，您需要：
- 从
IWbemServices.GetObject(ClassName) 获取 WMI class
- 调用
IWbemClassObject.GetMethod(MethodName)获取函数的参数信息(In and Out Params)
- 通过一个
VARIANT将需要的值传递给对应的：IWbemClassObject.Put("Name",VARIANT)。也许只是在 pascal 中这样做：objInParams.Properties_.Item('Name').Value := xxx;
- 获取class的实例并获取其Object Path，最后执行
IWbemServices.ExecMethod(path,MethodName,objInParams,objOutParams).
还有一个C++的sample with WmiMonitorDescriptorMethods.WmiGetMonitorRawEEdidV1Block here，虽然我对FreePascal不熟悉，你也可以照着步骤转成FreePascal
我找到了一段 Delphi 代码，它以与 Drake Wu 的 C++ 示例相同的方式设置了许多标准对象。
我对那个例子很感兴趣，因为我对 edids 很感兴趣，所以我完全翻译了所说的 C++ 文章的解决方案 Delphi/FPC。好像还行。
program wmiedidint2;
// based on https://theroadtodelphi.com/2011/04/21/accesing-the-wmi-from-delphi-and-fpc-via-com-without-late-binding-or-wbemscripting_tlb/
// modified to function as https://docs.microsoft.com/en-us/answers/questions/95631/wmi-c-application-problem-wmimonitordescriptormeth.html?childToView=96407#answer-96407
{$IFDEF FPC}
{$MODE DELPHI} {$H+}
{$ENDIF}
{$APPTYPE CONSOLE}
uses
Windows,
Variants,
SysUtils,
ActiveX,
JwaWbemCli;
const
RPC_C_AUTHN_LEVEL_DEFAULT = 0;
RPC_C_IMP_LEVEL_IMPERSONATE = 3;
RPC_C_AUTHN_WINNT = 10;
RPC_C_AUTHZ_NONE = 0;
RPC_C_AUTHN_LEVEL_CALL = 3;
EOAC_NONE = 0;
function GetBytesFromVariant(const V: Variant): TBytes;
// this function is a mess and only works for bytes. From SO
var
Len: Integer;
SafeArray: PVarArray;
begin
Len := 1+VarArrayHighBound(v, 1)-VarArrayLowBound(v, 1);
SetLength(Result, Len);
SafeArray := VarArrayAsPSafeArray(V);
Move(SafeArray.Data^, Pointer(Result)^, Length(result)*SizeOf(result[0]));
end;
procedure Test_IWbemServices_ExecQuery;
const
strLocale = '';
strUser = '';
strPassword = '';
strNetworkResource = 'root\WMI';
strAuthority = '';
WQL = 'SELECT * FROM WmiMonitorDescriptorMethods';
EDIDMethodname = 'WmiGetMonitorRawEEdidV1Block';
EDIDClassName = 'WmiMonitorDescriptorMethods';
var
FWbemLocator : IWbemLocator;
FWbemServices : IWbemServices;
FUnsecuredApartment : IUnsecuredApartment;
ppEnum : IEnumWbemClassObject;
apObjects : IWbemClassObject;
puReturned : ULONG;
pVal : OleVariant;
pType : Integer;
plFlavor : Integer;
Succeed : HRESULT;
varreturnvalue : olevariant;
varotherval : longint;
varcmd2 : tagVariant;
varcommand : olevariant; // tagVARIANT;
pOutParamsDefinition,
pInParamsDefinition,
pClass,
pClassInstance : IWbemClassObject;
callres : IWbemCallResult;
err : IErrorInfo;
aname,w2 : Widestring;
bytes : TBytes;
i : integer;
procedure teststatus(const msg:string);
begin
if Succeeded(succeed) then
writeln('Successs:',msg)
else
writeln('Fail:',msg)
end;
begin
// Set general COM security levels --------------------------
// Note: If you are using Windows 2000, you need to specify -
// the default authentication credentials for a user by using
// a SOLE_AUTHENTICATION_LIST structure in the pAuthList ----
// parameter of CoInitializeSecurity ------------------------
if Failed(CoInitializeSecurity(nil, -1, nil, nil, RPC_C_AUTHN_LEVEL_DEFAULT, RPC_C_IMP_LEVEL_IMPERSONATE, nil, EOAC_NONE, nil)) then Exit;
// Obtain the initial locator to WMI -------------------------
if Succeeded(CoCreateInstance(CLSID_WbemLocator, nil, CLSCTX_INPROC_SERVER, IID_IWbemLocator, FWbemLocator)) then
try
// Connect to WMI through the IWbemLocator::ConnectServer method
if Succeeded(FWbemLocator.ConnectServer(strNetworkResource, strUser, strPassword, strLocale, WBEM_FLAG_CONNECT_USE_MAX_WAIT, strAuthority, nil, FWbemServices)) then
try
// Set security levels on the proxy -------------------------
if Failed(CoSetProxyBlanket(FWbemServices, RPC_C_AUTHN_WINNT, RPC_C_AUTHZ_NONE, nil, RPC_C_AUTHN_LEVEL_CALL, RPC_C_IMP_LEVEL_IMPERSONATE, nil, EOAC_NONE)) then Exit;
if Succeeded(CoCreateInstance(CLSID_UnsecuredApartment, nil, CLSCTX_LOCAL_SERVER, IID_IUnsecuredApartment, FUnsecuredApartment)) then
try
// Use the IWbemServices pointer to make requests of WMI
//Succeed := FWbemServices.ExecQuery('WQL', WQL, WBEM_FLAG_FORWARD_ONLY OR WBEM_FLAG_RETURN_IMMEDIATELY, nil, ppEnum);
Succeed := FWbemServices.ExecQuery('WQL', WQL, WBEM_FLAG_FORWARD_ONLY, nil, ppEnum);
if Succeeded(Succeed) then
begin
Writeln('Running Wmi Query..Press Enter to exit');
// Get the data from the query
while (ppEnum.Next(WBEM_INFINITE, 1, apObjects, puReturned)=0) do
begin
succeed:= apObjects.Get('__PATH', 0, pVal, pType, plFlavor);
teststatus('get __PATH');
aname:=pval;
writeln('__PATH: ',aname);
succeed:=fwbemservices.GetObject(edidclassname,0,nil,pClass,callres);
teststatus('getobject');
succeed:=pClass.GetMethod(EDIDMethodname,0,pInParamsDefinition,pOutParamsDefinition);
teststatus('getmethod');
succeed:=pInParamsDefinition.SpawnInstance(0, pClassInstance);
teststatus('Spawn');
fillchar(varcmd2,sizeof(varcommand),#0);
varcmd2.vt:=VT_UI1;
varcmd2.bval:=0;
move(varcmd2,varcommand,sizeof(varcmd2));
succeed:= pClassInstance.Put('BlockId',0,@VarCommand,0);
teststatus('put blockid');
writeln('The BlockId is: ,',varCommand);
pOutParamsDefinition:=Nil;
callres:=nil;
w2:=EDIDMethodname;
succeed:= fwbemservices.ExecMethod(aname,w2,0,nil,pClassInstance,pOutParamsDefinition,callres);
if succeeded(succeed) then
begin
writeln('execute success!');
end;
succeed:= pOutParamsDefinition.Get('BlockType', 0, varreturnvalue,ptype,plFlavor);
if succeeded(succeed) then
begin
writeln('blocktype:',varreturnvalue);
varotherval:=varreturnvalue;
if varotherval=1 then
begin
succeed:= pOutParamsDefinition.Get('BlockContent', 0, varreturnvalue,ptype,plFlavor);
if succeeded(succeed) then
begin
bytes:=GetBytesFromVariant(varreturnvalue);
write('bytes:');
for i:=0 to length(bytes)-1 do
begin
write('$',inttohex(bytes[i],2),' ');
end;
writeln;
end;
end;
end;
end;
end
else
Writeln(Format('Error executing WQL sentence %x',[Succeed]));
finally
FUnsecuredApartment := nil;
end;
finally
FWbemServices := nil;
end;
finally
FWbemLocator := nil;
end;
end;
begin
// Initialize COM. ------------------------------------------
if Succeeded(CoInitializeEx(nil, COINIT_MULTITHREADED)) then
try
Test_IWbemServices_ExecQuery;
finally
CoUninitialize();
end;
Readln;
end.
请注意，原始 (roadtodelphi) 页面还演示了事件接收器
我正在寻找有关如何调用 WMI 函数的示例代码。有没有人在 FreePascal 中有一个工作示例，最好包括有关如何将参数传递给函数的代码？不幸的是，“Delphi WMI code Creator”对我没有帮助，因为用于创建函数的 FreePascal 代码不起作用。
明确一点：这不是查询 WMI 属性，而是调用类似 Win32_Printer.AddPrinterConnection 的函数（仅举个例子）。
要调用 WMI 函数，您需要：
- 从
IWbemServices.GetObject(ClassName) 获取 WMI class
- 调用
IWbemClassObject.GetMethod(MethodName)获取函数的参数信息(In and Out Params) - 通过一个
VARIANT将需要的值传递给对应的：IWbemClassObject.Put("Name",VARIANT)。也许只是在 pascal 中这样做：objInParams.Properties_.Item('Name').Value := xxx; - 获取class的实例并获取其Object Path，最后执行
IWbemServices.ExecMethod(path,MethodName,objInParams,objOutParams).
还有一个C++的sample with WmiMonitorDescriptorMethods.WmiGetMonitorRawEEdidV1Block here，虽然我对FreePascal不熟悉，你也可以照着步骤转成FreePascal
我找到了一段 Delphi 代码，它以与 Drake Wu 的 C++ 示例相同的方式设置了许多标准对象。
我对那个例子很感兴趣，因为我对 edids 很感兴趣，所以我完全翻译了所说的 C++ 文章的解决方案 Delphi/FPC。好像还行。
program wmiedidint2;
// based on https://theroadtodelphi.com/2011/04/21/accesing-the-wmi-from-delphi-and-fpc-via-com-without-late-binding-or-wbemscripting_tlb/
// modified to function as https://docs.microsoft.com/en-us/answers/questions/95631/wmi-c-application-problem-wmimonitordescriptormeth.html?childToView=96407#answer-96407
{$IFDEF FPC}
{$MODE DELPHI} {$H+}
{$ENDIF}
{$APPTYPE CONSOLE}
uses
Windows,
Variants,
SysUtils,
ActiveX,
JwaWbemCli;
const
RPC_C_AUTHN_LEVEL_DEFAULT = 0;
RPC_C_IMP_LEVEL_IMPERSONATE = 3;
RPC_C_AUTHN_WINNT = 10;
RPC_C_AUTHZ_NONE = 0;
RPC_C_AUTHN_LEVEL_CALL = 3;
EOAC_NONE = 0;
function GetBytesFromVariant(const V: Variant): TBytes;
// this function is a mess and only works for bytes. From SO
var
Len: Integer;
SafeArray: PVarArray;
begin
Len := 1+VarArrayHighBound(v, 1)-VarArrayLowBound(v, 1);
SetLength(Result, Len);
SafeArray := VarArrayAsPSafeArray(V);
Move(SafeArray.Data^, Pointer(Result)^, Length(result)*SizeOf(result[0]));
end;
procedure Test_IWbemServices_ExecQuery;
const
strLocale = '';
strUser = '';
strPassword = '';
strNetworkResource = 'root\WMI';
strAuthority = '';
WQL = 'SELECT * FROM WmiMonitorDescriptorMethods';
EDIDMethodname = 'WmiGetMonitorRawEEdidV1Block';
EDIDClassName = 'WmiMonitorDescriptorMethods';
var
FWbemLocator : IWbemLocator;
FWbemServices : IWbemServices;
FUnsecuredApartment : IUnsecuredApartment;
ppEnum : IEnumWbemClassObject;
apObjects : IWbemClassObject;
puReturned : ULONG;
pVal : OleVariant;
pType : Integer;
plFlavor : Integer;
Succeed : HRESULT;
varreturnvalue : olevariant;
varotherval : longint;
varcmd2 : tagVariant;
varcommand : olevariant; // tagVARIANT;
pOutParamsDefinition,
pInParamsDefinition,
pClass,
pClassInstance : IWbemClassObject;
callres : IWbemCallResult;
err : IErrorInfo;
aname,w2 : Widestring;
bytes : TBytes;
i : integer;
procedure teststatus(const msg:string);
begin
if Succeeded(succeed) then
writeln('Successs:',msg)
else
writeln('Fail:',msg)
end;
begin
// Set general COM security levels --------------------------
// Note: If you are using Windows 2000, you need to specify -
// the default authentication credentials for a user by using
// a SOLE_AUTHENTICATION_LIST structure in the pAuthList ----
// parameter of CoInitializeSecurity ------------------------
if Failed(CoInitializeSecurity(nil, -1, nil, nil, RPC_C_AUTHN_LEVEL_DEFAULT, RPC_C_IMP_LEVEL_IMPERSONATE, nil, EOAC_NONE, nil)) then Exit;
// Obtain the initial locator to WMI -------------------------
if Succeeded(CoCreateInstance(CLSID_WbemLocator, nil, CLSCTX_INPROC_SERVER, IID_IWbemLocator, FWbemLocator)) then
try
// Connect to WMI through the IWbemLocator::ConnectServer method
if Succeeded(FWbemLocator.ConnectServer(strNetworkResource, strUser, strPassword, strLocale, WBEM_FLAG_CONNECT_USE_MAX_WAIT, strAuthority, nil, FWbemServices)) then
try
// Set security levels on the proxy -------------------------
if Failed(CoSetProxyBlanket(FWbemServices, RPC_C_AUTHN_WINNT, RPC_C_AUTHZ_NONE, nil, RPC_C_AUTHN_LEVEL_CALL, RPC_C_IMP_LEVEL_IMPERSONATE, nil, EOAC_NONE)) then Exit;
if Succeeded(CoCreateInstance(CLSID_UnsecuredApartment, nil, CLSCTX_LOCAL_SERVER, IID_IUnsecuredApartment, FUnsecuredApartment)) then
try
// Use the IWbemServices pointer to make requests of WMI
//Succeed := FWbemServices.ExecQuery('WQL', WQL, WBEM_FLAG_FORWARD_ONLY OR WBEM_FLAG_RETURN_IMMEDIATELY, nil, ppEnum);
Succeed := FWbemServices.ExecQuery('WQL', WQL, WBEM_FLAG_FORWARD_ONLY, nil, ppEnum);
if Succeeded(Succeed) then
begin
Writeln('Running Wmi Query..Press Enter to exit');
// Get the data from the query
while (ppEnum.Next(WBEM_INFINITE, 1, apObjects, puReturned)=0) do
begin
succeed:= apObjects.Get('__PATH', 0, pVal, pType, plFlavor);
teststatus('get __PATH');
aname:=pval;
writeln('__PATH: ',aname);
succeed:=fwbemservices.GetObject(edidclassname,0,nil,pClass,callres);
teststatus('getobject');
succeed:=pClass.GetMethod(EDIDMethodname,0,pInParamsDefinition,pOutParamsDefinition);
teststatus('getmethod');
succeed:=pInParamsDefinition.SpawnInstance(0, pClassInstance);
teststatus('Spawn');
fillchar(varcmd2,sizeof(varcommand),#0);
varcmd2.vt:=VT_UI1;
varcmd2.bval:=0;
move(varcmd2,varcommand,sizeof(varcmd2));
succeed:= pClassInstance.Put('BlockId',0,@VarCommand,0);
teststatus('put blockid');
writeln('The BlockId is: ,',varCommand);
pOutParamsDefinition:=Nil;
callres:=nil;
w2:=EDIDMethodname;
succeed:= fwbemservices.ExecMethod(aname,w2,0,nil,pClassInstance,pOutParamsDefinition,callres);
if succeeded(succeed) then
begin
writeln('execute success!');
end;
succeed:= pOutParamsDefinition.Get('BlockType', 0, varreturnvalue,ptype,plFlavor);
if succeeded(succeed) then
begin
writeln('blocktype:',varreturnvalue);
varotherval:=varreturnvalue;
if varotherval=1 then
begin
succeed:= pOutParamsDefinition.Get('BlockContent', 0, varreturnvalue,ptype,plFlavor);
if succeeded(succeed) then
begin
bytes:=GetBytesFromVariant(varreturnvalue);
write('bytes:');
for i:=0 to length(bytes)-1 do
begin
write('$',inttohex(bytes[i],2),' ');
end;
writeln;
end;
end;
end;
end;
end
else
Writeln(Format('Error executing WQL sentence %x',[Succeed]));
finally
FUnsecuredApartment := nil;
end;
finally
FWbemServices := nil;
end;
finally
FWbemLocator := nil;
end;
end;
begin
// Initialize COM. ------------------------------------------
if Succeeded(CoInitializeEx(nil, COINIT_MULTITHREADED)) then
try
Test_IWbemServices_ExecQuery;
finally
CoUninitialize();
end;
Readln;
end.
请注意，原始 (roadtodelphi) 页面还演示了事件接收器