有一个代码
for j := 0 to mForm.ComponentCount - 1 do
if mForm.Components[j] is TableFormInfo then
//try
//table := nil;
//tempFmtable := nil;
//tForm := nil;
tForm := mForm.Components[j] as TableFormInfo;
table := TTableSpec(DBSchema.Tables.FindComponent(tForm.Table));
tempFmtable := TfmTableData.Create(MainWindow);
tempFmtable.Name := tForm.Name;
tempFmtable.tname := tForm.Table;
//tempFmtable.Caption := Utf8ToAnsi(table.Description);
tempFmtable.Left := tForm.LeftValue;
tempFmtable.Top := tForm.TopValue;
tempFmtable.Height := tForm.HeightValue;
tempFmtable.Width := tForm.WidthValue;
tempFmTable.IBQuery1.SQL.Clear;
tempFmtable.IBQuery1.SQL.Add('select * from ' + table.Name);
tempFmtable.IBQuery1.Open;
tempFmtable.DragKind:=dkDock;
tempFmtable.DragMode:=dmAutomatic;
i := 0;
querystr:='select ';
while i <= tForm.ComponentCount - 1 do
begin
if tForm.Components[i] is TableFieldInfo then
begin
//querystr:='select ';
//field := nil;
//tempFmtable.Show;
field := tForm.Components[i] as TableFieldInfo;
tempFmtable.Caption:=tForm.Caption;
tempFmtable.DBGrid1.Columns[i].FieldName := field.FieldNameValue;
tempFmtable.DBGrid1.Columns[i].Title.Caption := field.DescriptionValue;
tempFmtable.DBGrid1.Columns[i].Index := field.IndexValue;
tempFmtable.DBGrid1.Columns[i].Visible := field.VisibleValue;
tempFmtable.DBGrid1.Columns[i].Width:=field.WidthValue;
//tempFmtable.CheckListBox1.Items.Add(field.Description);
//tempFmtable.CheckListBox1.Checked[i] := field.Visible;
//tempFmtable.Show;
if field.VisibleValue then querystr:=querystr+ConvertNameField(field.FieldNameValue)+', ';
end;
//inc(i);
if tForm.Components[i] is SettingsFormInfo then
begin
//sForm:=nil;
sForm:=tForm.Components[i] as SettingsFormInfo;
tempsettings := TfmSettings.Create(tempFmtable);
tempsettings.Caption:=sForm.Caption;
//tempsettings := TfmSettings.Create(tempFmtable);
tempsettings.Name := sForm.Name;
tempsettings.Left := sForm.LeftValue;
tempsettings.Top := sForm.TopValue;
tempsettings.Height := sForm.HeightValue;
tempsettings.Width := sForm.WidthValue;
tempSettings.CheckListBox1.Clear;
//for k:=0 to sForm.ComponentCount-1 do
k:=0;
while k<=sForm.ComponentCount-1 do
begin
if sForm.Components[k] is ItemCheckListBoxInfo then
begin
//item:=nil;
item:=sForm.Components[k] as ItemCheckListBoxInfo;
tempsettings.CheckListBox1.Items.Add(item.TextValue);
tempsettings.CheckListBox1.Checked[item.IndexValue]:=item.CheckedValue
end;
if sForm.Components[k] is LabelInfo then
begin
//labelobj:=nil;
labelobj:=sForm.Components[k] as LabelInfo;
tempsettings.Label1.Caption:=labelobj.CaptionValue;
end;
if sForm.Components[k] is EditInfo then
begin
//edit:=nil;
edit:=sForm.Components[k] as EditInfo;
TEdit(tempsettings.FindComponent(edit.Name)).Text:=edit.TextValue;
end;
inc(k);
end;
if ((tForm.Components[i] is SettingsFormInfo) and (i=tForm.ComponentCount-1) and (k=sForm.ComponentCount)) then tempsettings.Show;
end;
//inc(i);
//if ((tForm.Components[i] is SettingsFormInfo) and (i=tForm.ComponentCount-1) and (k=sForm.ComponentCount)) then tempsettings.Show;
inc(i);
end;
{for i := 0 to table.Fields.ComponentCount - 1 do
begin
descr := Utf8ToAnsi(((table.Fields.Components[i]) as TFieldSpec).Description);
tempFmtable.CheckListBox1.Items.Add(descr);
tempFmtable.DBGrid1.Columns[i].Title.Caption := descr;
tempFmtable.CheckListBox1.Checked[i] := true;
end; }
Delete(querystr, Length(querystr)-1, 1);
querystr:=querystr+'from '+table.Name;
tempFmTable.IBQuery1.SQL.Clear;
tempFmtable.IBQuery1.SQL.Add(querystr);
tempFmtable.IBQuery1.Open;
for s := 0 to tForm.ComponentCount-1 do
begin
if tForm.Components[s] is TableFieldInfo then
begin
//field := nil;
//tempFmtable.Show;
field := tForm.Components[s] as TableFieldInfo;
if field.VisibleValue then
begin
for t := 0 to tempFmtable.DBGrid1.Columns.Count-1 do
begin
if ((tempFmTable.DBGrid1.Columns[t].Title.Caption=field.DescriptionValue) and (tempFmtable.DBGrid1.Columns[t].FieldName=field.FieldNameValue)) then
tempFmTable.DBGrid1.Columns[t].Width:=field.WidthValue;
end;
end;
end;
end;
tempFmtable.Show;
通过反序列化而变得状况良好。我想在行前使用tForm变量之前进行标记
table := TTableSpec(DBSchema.Tables.FindComponent(tForm.Table));
它在上一行中初始化
tForm := mForm.Components[j] as TableFormInfo;
但是尽管在组装过程中发生此警告
[dcc32 Warning] SerAndDeser.pas(298): W1036 Variable 'tForm' might not have been initialized
为什么?如何在不丢失应用程序功能的情况下摆脱警告?
最佳答案
您的缩进完全不对。我认为这就是让您感到困惑的地方。如果您正确缩进代码,则如下所示:
for j := 0 to mForm.ComponentCount - 1 do
if mForm.Components[j] is TableFormInfo then
// try
// table := nil;
// tempFmtable := nil;
// tForm := nil;
tForm := mForm.Components[j] as TableFormInfo;
table := TTableSpec(DBSchema.Tables.FindComponent(tForm.table));
我认为现在可以清楚地看到,
for
循环之后的代码可以在没有分配tForm
的情况下执行。从问题的缩进可以清楚地看出,您希望将分配之后的长段代码放在
if
语句中。但是编译器遵循代码而不是缩进。您将需要在代码中添加一些
begin/end
对。我个人从未使用过单语句语法–我的所有块都是用begin/end
对包装的复合块。在我看来,单条语句语法是Pascal的重大错误之一。确实是C。我使用内置的代码格式化程序来理顺您的缩进。那可能是一个有用的工具,可以帮助您修复代码。它可以让您掌握缩进的正确布局方式。
最后,正如我之前至少对您说过的那样,请勿将
tForm
用作变量名。这将隐藏名为TForm
的类型。 T
前缀为类型保留。您应该调用表单变量Form
或LForm
,并用L
指示它是局部变量。关于delphi - SerAndDeser.pas(298):W1036变量“tForm”可能尚未初始化,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/13955077/