ComBoBox控件，如果里面有item为空，那么就报ntdll.dll的解决办法
ComBoBox控件，如果里面有item为空，那么就报ntdll.dll的解决办法
经过在网上查询，终于找到了一个解决方案，下载到了一个pas文件
把这个pas文件 add to project 后，就不报错了，确实不错
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复制下面的代码，保存到 D7ComboBoxStringsGetPatch.pas 即可
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unit D7ComboBoxStringsGetPatch;
// The patch fixes TCustomComboBoxStrings.Get method for empty string item in Delphi 7.
interface
{$IF RTLVersion <> 15.0}
'This patch is intended for Delphi 7 only';
{$IFEND}
implementation
uses
Windows, SysUtils, StdCtrls;
resourcestring
RsPatchingFailed = 'TCustomComboBoxStrings.Get patching failed.';
type
TPatchResult = (prNotNeeded, prOk, prError);
function PatchCode(RoutineStartAddr: Pointer; PatchOffset: Cardinal; OriginalCode: Pointer;
OriginalCodeLen: Cardinal; PatchedCode: Pointer; PatchedCodeLen: Cardinal): TPatchResult;
const
JmpOpCode = $25FF;
type
PPackageThunk = ^TPackageThunk;
TPackageThunk = packed record
JmpInstruction: Word;
JmpAddress: PPointer;
end;
var
CodeStart: Pointer;
BytesWritten: DWORD;
begin
if FindClassHInstance(System.TObject) <> HInstance then
with PPackageThunk(RoutineStartAddr)^ do
if JmpInstruction = JmpOpCode then
RoutineStartAddr := JmpAddress^
else
begin
Result := prError;
Exit;
end;
CodeStart := Pointer(LongWord(RoutineStartAddr) + PatchOffset);
if CompareMem(CodeStart, OriginalCode, OriginalCodeLen) then
begin
if WriteProcessMemory(GetCurrentProcess, CodeStart, PatchedCode, PatchedCodeLen, BytesWritten) and
(BytesWritten = PatchedCodeLen) then
begin
FlushInstructionCache(GetCurrentProcess, CodeStart, PatchedCodeLen);
Result := prOk;
end
else
Result := prError;
end
else
Result := prNotNeeded;
end;
type
TCustomComboBoxStringsHack = class(TCustomComboBoxStrings);
function AddrOfTCustomComboBoxStringsGet: Pointer;
begin
Result := @TCustomComboBoxStringsHack.Get;
end;
procedure PatchTCustomComboBoxStringsGet;
const
OriginalCode: Cardinal = $74FFF883; // CMP EAX, -1 | JZ +$26
PatchedCode: Cardinal = $7E00F883; // CMP EAX, 0 | JLE +$26
PatchOffset = $1F;
// for DEBUG DCU by Pavel Rogulin
OriginalCodeD: Cardinal = $FFF07D83;
PatchedCodeD: Cardinal = $00F07D83;
PatchOffsetD = $2E;
var
PatchResult: TPatchResult;
begin
PatchResult := PatchCode(AddrOfTCustomComboBoxStringsGet, PatchOffset, @OriginalCode, SizeOf(OriginalCode),
@PatchedCode, SizeOf(PatchedCode));
if PatchResult = prNotNeeded then
PatchResult := PatchCode(AddrOfTCustomComboBoxStringsGet, PatchOffsetD, @OriginalCodeD, SizeOf(OriginalCodeD),
@PatchedCodeD, SizeOf(PatchedCodeD));
case PatchResult of
prError:
begin
if IsConsole then
WriteLn(ErrOutput, RsPatchingFailed)
else
MessageBox(0, PChar(RsPatchingFailed), nil, MB_OK or MB_ICONSTOP or MB_TASKMODAL);
RunError(1);
end;
end;
end;
initialization
PatchTCustomComboBoxStringsGet;
end.
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