我有一个外部程序，它接受一些参数（PrintLabel），这些参数是使用 ShellExecute 从我的应用程序调用的。PrintLabel 如下所示。有时打印标签可能需要 15 到 20 秒。随着时间的推移，情况似乎变得更糟。如果重新启动 PC，则打印速度会再次加快，但随着时间的推移会变慢。有时它是随机的（即快然后慢）。我使用 SW_HIDE 是因为我不希望用户每次都看到控制台对话框。我知道它应该像普通打印机一样需要几秒钟，但 15 - 20 秒似乎太长了。是 Dymo LabelWriter 问题还是 ShellExecute 问题？ShellExecute 在 UI 线程中调用。有什么线索吗？
来自应用程序的 ShellExecute 语句：
ShellExecute(Application->Handle, "open", "C:\\Program Files\\Application\\PrintLabel", objdata, "C:\\Program Files\\Application", SW_HIDE);
打印标签代码：
...
m_DymoAddIn.Print2(Copies, false, Tray);
...
这是 CDymoAddIn4.h：
// Machine generated IDispatch wrapper class(es) created with Add Class from Typelib Wizard
// CDymoAddIn4 wrapper class
class CDymoAddIn4 : public COleDispatchDriver
{
public:
CDymoAddIn4(){} // Calls COleDispatchDriver default constructor
CDymoAddIn4(LPDISPATCH pDispatch) : COleDispatchDriver(pDispatch) {}
CDymoAddIn4(const CDymoAddIn4& dispatchSrc) : COleDispatchDriver(dispatchSrc) {}
// Attributes
public:
// Operations
public:
// IDymoAddIn4 methods
public:
BOOL Open(LPCTSTR FileName)
{
BOOL result;
static BYTE parms[] = VTS_BSTR ;
InvokeHelper(0x1, DISPATCH_METHOD, VT_BOOL, (void*)&result, parms, FileName);
return result;
}
BOOL Save()
{
BOOL result;
InvokeHelper(0x2, DISPATCH_METHOD, VT_BOOL, (void*)&result, NULL);
return result;
}
BOOL SaveAs(LPCTSTR FileName)
{
BOOL result;
static BYTE parms[] = VTS_BSTR ;
InvokeHelper(0x3, DISPATCH_METHOD, VT_BOOL, (void*)&result, parms, FileName);
return result;
}
BOOL Print(long Copies, BOOL bShowDialog)
{
BOOL result;
static BYTE parms[] = VTS_I4 VTS_BOOL ;
InvokeHelper(0x4, DISPATCH_METHOD, VT_BOOL, (void*)&result, parms, Copies, bShowDialog);
return result;
}
void Hide()
{
InvokeHelper(0x5, DISPATCH_METHOD, VT_EMPTY, NULL, NULL);
}
void Show()
{
InvokeHelper(0x6, DISPATCH_METHOD, VT_EMPTY, NULL, NULL);
}
void SysTray(BOOL State)
{
static BYTE parms[] = VTS_BOOL ;
InvokeHelper(0x7, DISPATCH_METHOD, VT_EMPTY, NULL, parms, State);
}
void Quit()
{
InvokeHelper(0x8, DISPATCH_METHOD, VT_EMPTY, NULL, NULL);
}
CString get_FileName()
{
CString result;
InvokeHelper(0x9, DISPATCH_PROPERTYGET, VT_BSTR, (void*)&result, NULL);
return result;
}
BOOL SelectPrinter(LPCTSTR Printer)
{
BOOL result;
static BYTE parms[] = VTS_BSTR ;
InvokeHelper(0xa, DISPATCH_METHOD, VT_BOOL, (void*)&result, parms, Printer);
return result;
}
CString GetDymoPrinters()
{
CString result;
InvokeHelper(0xb, DISPATCH_METHOD, VT_BSTR, (void*)&result, NULL);
return result;
}
CString GetMRULabelFiles()
{
CString result;
InvokeHelper(0x12d, DISPATCH_METHOD, VT_BSTR, (void*)&result, NULL);
return result;
}
BOOL Open2(LPCTSTR FileName)
{
BOOL result;
static BYTE parms[] = VTS_BSTR ;
InvokeHelper(0x12e, DISPATCH_METHOD, VT_BOOL, (void*)&result, parms, FileName);
return result;
}
long GetMRULabelFileCount()
{
long result;
InvokeHelper(0x12f, DISPATCH_METHOD, VT_I4, (void*)&result, NULL);
return result;
}
CString GetMRULabelFileName(long Index)
{
CString result;
static BYTE parms[] = VTS_I4 ;
InvokeHelper(0x130, DISPATCH_METHOD, VT_BSTR, (void*)&result, parms, Index);
return result;
}
BOOL OpenMRULabelFile(long Index)
{
BOOL result;
static BYTE parms[] = VTS_I4 ;
InvokeHelper(0x131, DISPATCH_METHOD, VT_BOOL, (void*)&result, parms, Index);
return result;
}
BOOL OpenMRULabelFileByName(LPCTSTR FileName)
{
BOOL result;
static BYTE parms[] = VTS_BSTR ;
InvokeHelper(0x132, DISPATCH_METHOD, VT_BOOL, (void*)&result, parms, FileName);
return result;
}
BOOL Print2(long Copies, BOOL bShowDlg, long Tray)
{
BOOL result;
static BYTE parms[] = VTS_I4 VTS_BOOL VTS_I4 ;
InvokeHelper(0x191, DISPATCH_METHOD, VT_BOOL, (void*)&result, parms, Copies, bShowDlg, Tray);
return result;
}
long GetCurrentPaperTray()
{
long result;
InvokeHelper(0x192, DISPATCH_METHOD, VT_I4, (void*)&result, NULL);
return result;
}
void StartPrintJob()
{
InvokeHelper(0xc9, DISPATCH_METHOD, VT_EMPTY, NULL, NULL);
}
void EndPrintJob()
{
InvokeHelper(0xca, DISPATCH_METHOD, VT_EMPTY, NULL, NULL);
}
BOOL IsTwinTurboPrinter(LPCTSTR PrinterName)
{
BOOL result;
static BYTE parms[] = VTS_BSTR ;
InvokeHelper(0xcb, DISPATCH_METHOD, VT_BOOL, (void*)&result, parms, PrinterName);
return result;
}
CString GetCurrentPrinterName()
{
CString result;
InvokeHelper(0xce, DISPATCH_METHOD, VT_BSTR, (void*)&result, NULL);
return result;
}
// IDymoAddIn4 properties
public:
};