如何在delphi中使用MetroCom.dll启动com端口
我在Delphi中编写代码来启动连接到我的设备的com端口,在地址0x0000处出现错误如何在delphi中使用MetroCom.dll启动com端口,delphi,winapi,port,Delphi,Winapi,Port,我在Delphi中编写代码来启动连接到我的设备的com端口,在地址0x0000处出现错误访问冲突我编写的代码是: unit Test_Cam; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls; type TByteArr = array of byte; TForm1 = class(TForm) B
访问冲突我编写的代码是:
unit Test_Cam;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TByteArr = array of byte;
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
ComboBox1: TComboBox;
procedure Button1Click(Sender: TObject);
procedure Doconnect;
procedure CamOpen;
Function StrToByte(const Value: String): TByteArr;
private
{ Private declarations }
public
published
property ObjectMenuItem;
{ Public declarations }
end;
TconfigPort = record
BaudRate:Integer; // baud rate
ByteSize:Integer; // number of bits/byte, 4-8
Parity:Integer; // 0-4=no,odd,even,mark,space
StopBits:Integer; // 0,1,2 = 1, 1.5, 2
fOutxCtsFlow:Integer; // CTS Flow Control
end;
TPROGRESS_FUNC = procedure (blocks_total,blocks_done:Integer) of Object;
var
Form1: TForm1;
Function MetrocomEnterImageUpl(nport:Integer):Boolean; external 'metrocom.dll';
procedure MetrocomAcquireFullFrame(nport:Integer); external 'metrocom.dll';
Function MetrocomUploadJpeg(nPort:Integer; PROGRESS_FUNC:Tprogress_func; szFileName:string; nSubsampling:integer):Boolean; external 'metrocom.dll';
Function MetrocomExitImageUpl(nPort:Integer):Boolean; external 'metrocom.dll';
Function MetrocomInitCommunication(nPort:Integer; COMMPORTCONFIG:TconfigPort):Boolean; external 'metrocom.dll';
Function MetrocomEndCommunication(nPort:Integer):Boolean; external 'metrocom.dll';
Function camSetImageCompression(cam_handle:Integer; quality:Integer; method:Integer):Integer; external 'Camlib.dll';
Function camSetCenteredWOI(cam_handle:Integer;img_width:Integer;img_height:Integer):Integer; external 'Camlib.dll';
Function camInit(dev_interface:Integer):Integer; external 'Camlib.dll';
Function camOpenEx2(device_name:TByteArr;ctl_bus_name:Byte;Var p_dev_type:Integer; ctl_bus_type:integer; camera_type:integer;dev_bus_type:Integer):Integer; external 'Camlib.dll';
Function camClose(cam_handle:Integer):Integer; external 'Camlib.dll';
Function camFree:Integer; external 'Camlib.dll';
Function camGetOperatingMode(cam_handle:Integer; var mode:Integer):Integer; external 'Camlib.dll';
var
Config_port: TconfigPort;
m_bConnect:Boolean = false;
m_nPort,m_nInit,nPort,i,j,m_camHandle:integer;
nDeviceType:Integer = 0;
device_name:string;
szDeviceName:TByteArr;
implementation
{$R *.dfm}
function TForm1.StrToByte(const Value: String): TByteArr;
var
I: integer;
begin
SetLength(Result, Length(Value));
for I := 0 to Length(Value) - 1 do
Result[I] := ord(Value[I + 1]) ;
end;
procedure Tform1.DoConnect;
begin
m_nPort := StrToInt(ComboBox1.Text) - 1;
Config_port.BaudRate := 9600;
Config_port.ByteSize := 8;
Config_port.Parity := 0;
Config_port.StopBits := 0;
m_bConnect := MetrocomInitCommunication(m_nPort , Config_port);
end;
procedure TForm1.CamOpen;
begin
m_nInit := camInit(0);
if m_nInit < 0 then
ShowMessage('Fail to camInit.');
nPort := m_nPort + 1;
device_name := 'COM' + IntToStr(nPort) + ' baud=' + IntToStr(Config_port.BaudRate) + ' parity=' + IntToStr(Config_port.Parity) + ' data=' + IntToStr(Config_port.ByteSize) + ' stop=' + IntToStr(Config_port.StopBits);
szDeviceName := strtobyte(device_name);
for i := 0 to 4 do
begin
for j := 0 to 4 do
begin
m_camHandle := camOpenEx2(szDeviceName, 0 , nDeviceType, 0, 1, 0);
if m_camHandle < 0 then break;
end;
if m_camHandle < 0 then break;
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
DoConnect;
CamOpen;
camSetImageCompression(m_camHandle, 30, 0);
camSetCenteredWOI(m_camHandle, 500, 220);
end;
end.
导入函数的调用约定不正确。您没有指定调用约定,因此使用默认的寄存器约定。查阅文档以了解使用了什么调用约定。。您提供的VB6声明使用stdcall,因此这就是我的钱所在。所有VB6导入都是stdcall。翻译标头时,始终确保正确指定了调用约定
修复后,互操作将出现更多问题。使用宾语显然是错误的。C++库将不实现此功能。使用Delphi字符串也是错误的。字符串可能会作为C字符串传递,C字符串是指向以null结尾的字符数组的指针。结构可能是通过引用而不是值传递的
对于所讨论的函数,C++声明明确表明结构是按引用传递的。
函数的声明应如下所示:
function MetrocomInitCommunication(
nPort: Integer;
const config: TConfigPort
): BOOL; stdcall; external 'metrocom.dll';
不要让我们猜测哪一行抛出错误。错误发生在何时执行此函数MetroCoMinitCommunications此处是发生的错误:过程Tform1.DoConnect;开始m_nPort:=stroint(ComboBox1.Text)-1;配置端口波特率:=9600;Config_port.ByteSize:=8;配置端口奇偶性:=0;Config_port.StopBits:=0;m_b连接:=MetrocomInitCommunication(m_n端口、配置端口);结束;在执行函数后,正好在这一行中:MetrocomInitCommunication(m_nPort,Config_port)感谢您的帮助,我更改了all函数并更新了代码,但在编译后,我在这行中遇到了另一个问题,我在地址0x0000中遇到了访问冲突。您能帮助我吗?请参阅:tt:=camSetImageCompression(m_camHandle,30,2)中的错误行;camSetCenteredWOI(m_camHandle,500220);编译好函数后,我得到了错误我在答案中解释了函数,我从函数中得到了值0,它是成功的,但在执行函数后出现了错误。我没有回答你问的问题吗?你现在问的是另一个API调用吗?hanks向你寻求帮助,但当我做更改时,我得到了相同的错误,但现在在不同的代码位置
function MetrocomInitCommunication(
nPort: Integer;
const config: TConfigPort
): BOOL; stdcall; external 'metrocom.dll';