我创建了一个 TThread 来处理 Excel 文件中的一些关键问题，但是，我目前遇到了一些挑战，因为该线程似乎无法与我的应用程序并行工作。尽管我尽了最大努力找出问题的根本原因，但到目前为止我一直没有成功。为了解决这个问题，我尝试用重写的 Execute 方法定义 TThread 类型，并尝试从 Synchronize 方法切换到 Queue 方法，但到目前为止，这两种方法都没有产生积极的结果。
procedure TForm2.Button1Click(Sender: TObject);
begin
TThread.CreateAnonymousThread(proc).Start;
end;
procedure TForm2.Proc;
var
refSheet: Integer;
RowCount,varGridRow:Integer;
i, j,k: Integer;
desc, refDesc, refRate: string;
delta: Integer;
OldValue:String;
ws: Variant;
ExcelApp: Variant;
begin
Tthread.Synchronize(nil,procedure ()begin
if OpenDialog1.Execute then
begin
ExcelApp := CreateOleObject('Excel.Application');
ExcelApp.Workbooks.Open(OpenDialog1.FileName);
end;
end);
Tthread.Synchronize(nil,procedure () begin
refSheet :=StrToInt(InputBox('','','3'));
if (refSheet <= 0) or (refSheet > ExcelApp.Worksheets.Count) then
begin
ShowMessage('Invalid sheet number');
Exit;
end;
end);
Tthread.Queue(nil,procedure ()var i,j,k:Integer; begin
IssamProgressBar1.Max:= ExcelApp.Worksheets[refSheet].UsedRange.Rows.Count;
RowCount:=1;
varGridRow := 1;
for i := 2 to ExcelApp.Worksheets[refSheet].UsedRange.Rows.Count do
begin
IssamProgressBar1.Progress:=i-2;
IssamProgressBar1.Refresh;
if (not VarIsEmpty(ExcelApp.Worksheets[refSheet].Cells[i, 2].Value))and (not VarIsEmpty(ExcelApp.Worksheets[refSheet].Cells[i, 1].Value)) then
begin
refDesc := ExcelApp.Worksheets[refSheet].Cells[i, 2].Text;
refRate := ExcelApp.Worksheets[refSheet].Cells[i, 5].Text;
Label3.Caption:=refDesc;
Label3.Refresh;
// Loop through other sheets
for j := 1 to ExcelApp.ActiveWorkbook.Sheets.Count do
begin
ws := ExcelApp.ActiveWorkbook.Sheets[j];
if ws.Index <> refSheet then
begin
// Loop through rows in current sheet
Label1.Caption:='Checking Sheet : '+ExcelApp.Worksheets[j].name;
Label1.Refresh;
for k := 2 to ws.UsedRange.Rows.Count do
begin
// Check if description matches approximately
desc := ws.Cells[k, 2].Value;
if (not VarIsEmpty(desc)) and (Not VarIsEmpty(ws.Cells[k, 1].Value)) then
begin
Label5.Caption:=desc;
Label5.Refresh;
if (refDesc = desc) and (refDesc <> 'Set of spare parts;') and (refDesc <> 'Set of tools and instruments;') then
begin
// Update rate
if (ws.Cells[k, 5].Value <> refRate) and VarIsNumeric(ws.Cells[k, 5].Value) then
begin
ws.Cells[k, 7].Value := ws.Cells[k, 5].Value;
OldValue:=ws.Cells[k, 5].Value;
ws.Cells[k, 5].Value := refRate;
delta := delta + 1;
ws.Cells[k, 5].Font.Color := RGB(255, 0, 0);
with StringGrid1 do
begin
RowCount := RowCount + 1;
Cells[0, varGridRow] := IntToStr(varGridRow);
Cells[1, varGridRow] := refDesc;
Cells[2, varGridRow] := OldValue;
Cells[3, varGridRow] := refRate;
Cells[4, varGridRow] := ExcelApp.Worksheets[j].Name;
Cells[5, varGridRow] := IntToStr(j);
Inc(varGridRow);
end;
end;
end;
end;
end;
end;
end;
end;
end;
end);
IssamProgressBar1.Progress:=0;
Label1.Caption:='';
Label3.Caption:='';
Label5.Caption:='';
ExcelApp.ActiveWorkbook.Close(False);
ExcelApp.Quit;
end;
我的问题是如何让我的 Proc 程序与我的应用程序并行工作。
不能跨线程边界使用 Excel COM 对象。你的整个线程设计是错误的。您需要在辅助线程中创建 COM 对象，而不是在主线程中。然后仅与主线程同步以获取文件名（或在启动线程之前询问它），然后完全在工作线程中加载和处理文件，而不是在主线程中。仅在需要访问 UI 时才与主线程同步。
换句话说，你所有的COM对象处理都应该只在工作线程中进行，而不是在主线程中进行。你正在同步太多的工作，破坏了使用线程的全部意义。
尝试更像这样的东西：
procedure TForm2.Button1Click(Sender: TObject);
begin
if OpenDialog1.Execute then
ProcessFileInThread(OpenDialog1.FileName);
end;
procedure TForm2.ProcessFileInThread(const AFileName: string);
begin
TThread.CreateAnonymousThread(
procedure
begin
InitThreadProc(AFileName);
end
).Start;
end;
procedure TForm2.InitThreadProc(const AFileName: string);
begin
CoInitialize(nil);
try
ProcessFile(AFileName);
finally
CoUninitialize;
end;
end;
procedure TForm2.ProcessFile(const AFileName: string);
var
refSheet, sheetCount, usedRowCount, RowCount: Integer;
i, j, k: Integer;
desc, refDesc, refRate, oldValue: string;
ExcelApp, refWorksheet, curWorksheet, tmpValue: Variant;
begin
ExcelApp := CreateOleObject('Excel.Application');
try
ExcelApp.Workbooks.Open(AFileName);
try
sheetCount := ExcelApp.Worksheets.Count;
TThread.Synchronize(nil,
procedure
begin
refSheet := StrToIntDef(InputBox('','','3'), -1);
if (refSheet <= 0) or (refSheet > sheetCount) then
begin
ShowMessage('Invalid sheet number');
Abort;
end;
end
);
refWorksheet := ExcelApp.Worksheets[refSheet];
usedRowCount := refWorksheet.UsedRange.Rows.Count;
ClearGrid;
UpdateProgress(0, usedRowCount);
for i := 2 to usedRowCount do
begin
UpdateProgress(i-2);
if VarIsEmpty(refWorksheet.Cells[i, 2].Value) or VarIsEmpty(refWorksheet.Cells[i, 1].Value) then
Continue;
refDesc := refWorksheet.Cells[i, 2].Text;
refRate := refWorksheet.Cells[i, 5].Text;
UpdateLabel(Label3, refDesc);
// Loop through other sheets
for j := 1 to ExcelApp.ActiveWorkbook.Sheets.Count do
begin
curWorksheet := ExcelApp.ActiveWorkbook.Sheets[j];
if curWorksheet.Index = refSheet then
Continue;
UpdateLabel(Label1, 'Checking Sheet : ' + curWorksheet.name);
// Loop through rows in current sheet
for k := 2 to curWorksheet.UsedRange.Rows.Count do
begin
// Check if description matches approximately
tmpValue := curWorksheet.Cells[k, 2].Value;
if VarIsEmpty(tmpValue) or VarIsEmpty(curWorksheet.Cells[k, 1].Value) then
Continue;
desc := VarToStr(tmpValue);
UpdateLabel(Label5, desc);
if (refDesc <> desc) or
(refDesc = 'Set of spare parts;') or
(refDesc = 'Set of tools and instruments;') or
(curWorksheet.Cells[k, 5].Value = refRate) or
(not VarIsNumeric(curWorksheet.Cells[k, 5].Value)) then
Continue;
// Update rate
curWorksheet.Cells[k, 7].Value := curWorksheet.Cells[k, 5].Value;
oldValue := curWorksheet.Cells[k, 5].Value;
curWorksheet.Cells[k, 5].Value := refRate;
curWorksheet.Cells[k, 5].Font.Color := RGB(255, 0, 0);
AddToGrid(refDesc, oldValue, refRate, curWorksheet.Name, j);
end;
end;
end;
ClearStatus;
finally
ExcelApp.ActiveWorkbook.Close(False);
end;
finally
ExcelApp.Quit;
end;
end;
procedure TForm2.UpdateProgress(AValue: Integer; AMax: Integer = -1);
begin
TThread.Queue(nil,
procedure
begin
if AMax > -1 then IssamProgressBar1.Max := AValue;
IssamProgressBar1.Progress := AValue;
end
);
end;
procedure TForm2.UpdateLabel(ALabel: TLabel; const AText: string);
begin
TThread.Queue(nil,
procedure
begin
ALabel.Caption := AText;
end
);
end;
procedure TForm1.AddToGrid(
const ADesc, AOldValue, ARate, ASheetName: string;
ASheetIndex: Integer);
var
Row: Integer;
begin
TThread.Queue(nil,
procedure
begin
Row := StringGrid1.RowCount;
StringGrid1.RowCount := Row + 1;
StringGrid1.Cells[0, Row] := IntToStr(Row);
StringGrid1.Cells[1, Row] := ADesc;
StringGrid1.Cells[2, Row] := AOldValue;
StringGrid1.Cells[3, Row] := ARate;
StringGrid1.Cells[4, Row] := ASheetName;
StringGrid1.Cells[5, Row] := IntToStr(ASheetIndex);
end
);
end;
procedure TForm2.ClearGrid;
begin
TThread.Queue(nil,
procedure
var
i: Integer;
begin
StringGrid1.RowCount := 1;
for i := 0 to StringGrid1.ColCount-1 do
StringGrid1.Cells[i, 0] = '';
end;
);
end;
procedure TForm2.ClearStatus;
begin
TThread.Queue(nil,
procedure
begin
IssamProgressBar1.Progress := 0;
Label1.Caption := '';
Label3.Caption := '';
Label5.Caption := '';
end
);
end;