Delphi中保证程序只运行一个实例的方法总结

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我是靠谱客的博主天真帆布鞋，这篇文章主要介绍Delphi中保证程序只运行一个实例的方法总结，现在分享给大家，希望可以做个参考。

在做Delphi的一个小工具的时候，要让自己的程序保证只启动一个实例如下有几种方法实现：

1.使用系统函数FindWindows()函数来实现：

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复制代码program Project1;
uses
Forms, Windows,//添加Windows单元
offertool in 'offertool.pas' {foffertool},
MyThread in 'MyThread.pas',
offerchild in 'offerchild.pas' {fofferchild};
{$R *.res}
var
Hwnd:THandle;
//添加一个句柄
begin
Hwnd := FindWindow('Tfoffertool',nil);
//参数1：窗口类名，参数2：窗口标题
if Hwnd=0 then
begin
Application.Initialize;
Application.CreateForm(Tfoffertool, foffertool);
Application.Run;
end
else
begin
Application.MessageBox('已经运行了一个实例','提示',MB_OK);
end;
end.program Project1;
uses
Forms, Windows,//添加Windows单元
offertool in 'offertool.pas' {foffertool},
MyThread in 'MyThread.pas',
offerchild in 'offerchild.pas' {fofferchild};
{$R *.res}
var
Hwnd:THandle;
//添加一个句柄
begin
Hwnd := FindWindow('Tfoffertool',nil);
//参数1：窗口类名，参数2：窗口标题
if Hwnd=0 then
begin
Application.Initialize;
Application.CreateForm(Tfoffertool, foffertool);
Application.Run;
end
else
begin
Application.MessageBox('已经运行了一个实例','提示',MB_OK);
end;
end.



2.使用使用互斥对象来实现：

复制代码program Project1;
uses
Forms, Windows, //添加Windows单元
offertool in 'offertool.pas' {foffertool},
MyThread in 'MyThread.pas',
offerchild in 'offerchild.pas' {fofferchild};
{$R *.res}
var
myMutex:THandle; //添加一个互斥锁句柄
begin
myMutex := CreateMutex(nil,True,'新股代理申购报盘');
if GetLastError<>ERROR_ALREADY_EXISTS then
begin
Application.Initialize;
Application.CreateForm(Tfoffertool, foffertool);
Application.Run;
end
else
Application.MessageBox('已经运行了一个实例','提示',MB_OK);
end.program Project1;
uses
Forms, Windows, //添加Windows单元
offertool in 'offertool.pas' {foffertool},
MyThread in 'MyThread.pas',
offerchild in 'offerchild.pas' {fofferchild};
{$R *.res}
var
myMutex:THandle; //添加一个互斥锁句柄
begin
myMutex := CreateMutex(nil,True,'新股代理申购报盘');
if GetLastError<>ERROR_ALREADY_EXISTS then
begin
Application.Initialize;
Application.CreateForm(Tfoffertool, foffertool);
Application.Run;
end
else
Application.MessageBox('已经运行了一个实例','提示',MB_OK);
end.


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